JP2006231323A - Decomposition treatment method for organic matter in organic polluted water and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method for organic polluted water and an apparatus therefor capable of cleaning treatment for the high-concentration organic polluted water, as it is, containing a solid organic matter such as sewage water without producing sludge. <P>SOLUTION: The decomposition treatment method in a cleaning area for the organic matter in the sewage water or waste water from a food factory comprises a decomposition process for a dissolved organic matter in the water to be treated chiefly by aerobic bacteria in an aerobic treatment area of the cleaning area, a decomposition process for a solid organic matter in the water to be treated chiefly by anaerobic bacteria in an anaerobic treatment area of the cleaning area, and a decomposition process for the organic matter chiefly by Tsukisei (gas-permeable) bacteria in a transition area which the water to be treated passes through and is formed at the border between the aerobic treatment area and the anaerobic treatment area. A plurality of the treatment units each of which comprises the three types of the decomposition processes mentioned above are carried out repeatedly, and, moreover, the first treatment and the last treatment in the cleaning area are both the aerobic treatment processes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a purification process in which organic matter is the main pollutant, specifically sewage or food-related factory wastewater (also simply referred to as organic polluted water) containing dissolved organic matter and solid organic matter at a high concentration. In particular, the present invention relates to a method for decomposing organic substances in organic polluted water and a decomposing apparatus that can decompose most of the organic substances in the water to be treated.

  Conventionally, as a method for treating organic waste water mainly containing soluble organic matter, various biological treatment methods for performing artificially efficient self-cleaning operations that are carried out in the natural world are known. Such a biological treatment method is widely used because the treatment cost is relatively low, and in particular, an activated sludge method using aerobic microorganisms is practiced in various fields.

  The purification mechanism in the activated sludge method described above is that bacteria (aerobic bacteria) quickly decompose the soluble organic component indicated by BOD, the protozoa prey on the grown bacteria, and the grown protozoa adheres A solid organic substance is adhered as an agent to form a large floc, and the floc is solid-liquid separated in a sedimentation basin to purify organic wastewater to obtain treated water. Therefore, in the activated sludge method, it is necessary to perform the aerobic bacteria and protozoan life activities in good condition, so that the flow in the treatment tank (aeration tank) is made uniform, and the aerobic constant conditions are always maintained. I am doing so.

  As described above, in the activated sludge method, the soluble organic matter in the organic wastewater is biodegraded in the aeration tank, but the solid organic matter does not decompose, and the solid sludge is placed in the sedimentation pond located downstream of the aeration tank. It is separated. In other words, the purification treatment in the activated sludge method is not all biodegradation, but the essence is rather solid-liquid separation of suspended matter (SS: solid organic matter in this specification) in the water to be treated. It can be said that.

  As described above, the activated sludge method is based on the essence of solid-liquid separation and removal of organic substances in the water to be treated, and thus a large amount of sludge separated by solid-liquid is inevitably generated. For this reason, in the activated sludge method, only the amount necessary for the purification treatment of the next treated water from the activated sludge after solid-liquid separation is returned to the aeration tank as return sludge and used for the next biological treatment. Other than that, it is removed as surplus sludge, and in the activated sludge process, the treatment and disposal of a large amount of surplus sludge becomes a serious problem.

  On the other hand, in the activated sludge method, various attempts have been made to efficiently treat surplus sludge and reduce the amount of surplus sludge generated. However, a treatment method that can eliminate (ie, eliminate) excess sludge, is economical, and has no problem of secondary contamination due to the use of chemicals or the like has not yet been known. In particular, in recent years when protection of the global environment is screamed, the problem of the treatment of excess sludge is serious, and the development of a method for purifying organic wastewater without such a problem is awaited.

  The activated sludge method has the following problems in addition to the above-mentioned surplus sludge treatment problem. That is, since the amount of BOD pollution load that can be treated in the aeration tank in the activated sludge method is determined, the aeration tank is always kept in an aerobic and constant condition by aeration, and expressed by the BOD of the liquid to be treated in the aeration tank. The organic wastewater is treated by adjusting the residence time so that the pollutant concentration of the dissolved organic matter is lowered to a preferable range. For this reason, when processing the organic waste water which contains soluble organic substance in high concentration, it is necessary to enlarge the facility which should be processed.

  Furthermore, especially in the case of high-concentration organic wastewater, the fluctuation of the concentration of BOD and SS in the incoming organic wastewater is large, so that the inside of the aeration tank can be managed in a state where the purification treatment can always be performed satisfactorily. difficult. For this reason, when processing the high concentration organic waste water by the activated sludge method, it is necessary to provide an adjustment tank in the previous stage. As described above, in the normal activated sludge method, organic substances are mainly used, and specifically, soluble organic substances and solid organic substances are contained at a high concentration (for example, BOD is 100 mg / liter or more and SS is 100 mg / liter). It is difficult to efficiently treat high-concentration organic wastewater such as sewage and food-related factory wastewater.

  In addition, the catalytic oxidation method is also known at the same time as the activated sludge method, but the number used in comparison with the activated sludge method is very small, and the post-finishing process of the activated sludge method and the pretreatment of the water treatment It is only used in the process. Initially, the trickling filter method, which is one of the catalytic oxidation methods, was used. Although this method can reduce the amount of sludge by 10 to 20% compared to the activated sludge method, There are other problems such as generation of odor, generation of filter beds, etc., which are not completely absent at present. In place of this, a contact oxidation method using a rotating disk, a honeycomb tube, and other various plastic materials has been proposed, but these are only implemented in a small part.

  Recently, attempts have been made to increase the treatment efficiency by putting the carrier into the activated sludge tank and using it in combination with partial catalytic oxidation, but even in this case, the amount of sludge generated is compared to the standard activated sludge method. Only about 5 to 20%.

  As a facility for reducing excess sludge generated by the activated sludge method, a digester is provided. This digester is a facility where sludge is heated to 37 ° C. in an anaerobic state and left for 30 days. However, even in this facility, the reduction amount of the inserted sludge is about 40% at the maximum.

  As described above, in the activated sludge process that occupies most of the current organic wastewater treatment, the aeration tank is always aerobic and constant, while the digester is anaerobic and constant. Therefore, the decomposition of sludge (solid organic matter) is about 5% at the maximum in the former and about 40% at the maximum even in the latter.

  In contrast to the biological treatment of organic wastewater as described above, the present inventor has so far completely purified organic wastewater that actively utilizes the self-cleaning action that has been conducted in nature. The separation material for polluted water purification which enables a process is proposed (refer patent document 1). The separating material for purifying polluted water is composed of an aggregate of crushed stones in which a plurality of crushed stones having an average diameter of 1 to 3 cm are assembled. Furthermore, as a technique using the aggregate (bulk purification material), a purification method (see Patent Document 2) for more efficiently purifying organic wastewater, and another means for purifying organic wastewater, A method for purifying polluted water using a bulk purification material comprising a hollow body having an opening has been proposed (see Patent Document 3). According to these technologies, the separation operation of the solid floating in the polluted water can be effectively performed, and the organic waste water can be circulated through the purification zone in which a plurality of the bulk purification materials as described above are stacked and arranged. Purification of solid contaminants and the like can be performed.

Japanese Patent Publication No.8-17901 JP-A-8-332497 JP-A-8-108191

  Therefore, the object of the present invention is to treat organic polluted water containing high concentrations of soluble organic matter and solid organic matter in sewage or food-related factory effluent, which is difficult to treat with the conventional activated sludge method, The treated water can be treated as it is (raw water state), and all of the organic matter in the treated water including solid organic matter can be biodegraded, and in particular, surplus sludge which is a drawback of the activated sludge method An object of the present invention is to provide a processing method and a processing apparatus for high-concentration organic waste water that does not cause processing problems.

  The above object is achieved by the present invention described below. That is, the present invention is a method for decomposing organic matter in organic polluted water, in which organic polluted water of sewage or food-related factory wastewater mainly composed of organic matter is treated water, and the organic matter in the treated water is decomposed in a purification zone. In the method, the dissolved organic matter in the water to be treated is decomposed mainly by aerobic bacteria in the aerobic treatment region formed in the purification region, and the anaerobic bacteria are mainly covered by the anaerobic bacteria in the anaerobic treatment region formed in the purification region. Organic substances in the water to be treated mainly by aerobic bacteria in the transition region formed at the boundary between the aerobic treatment region and the anaerobic treatment region in which the solid water in the treated water is decomposed and the treated water flows. When the combination of decomposition in the aerobic treatment region, anaerobic treatment region, and transition region is 1, the combination is repeated a plurality of times, and the purification is further performed. Is a cracking process of organic matter organic pollution in water, characterized in that none of the first process and the final process is aerobic process to be in.

  As a preferred embodiment, there is a method for decomposing organic matter in the organic polluted water, wherein the number of repetitions is 3 or more and 20 or less, more preferably 3 or more and 10 or less, and further preferably 3 or more and 5 or less. . As another preferred embodiment, there is a method for decomposing any organic matter in the organic polluted water in which the number of repetitions is linearly performed sequentially along the inflow path of the water to be treated.

  Another embodiment of the present invention introduces organic polluted water of sewage or food-related factory wastewater mainly composed of organic matter into the treatment tank as treated water, and the organic matter in the treated water in the treatment tank. An apparatus for decomposing organic matter in organic polluted water for decomposing water, wherein the treatment tank includes an inlet to the treated water treatment tank, and a treated water discharge port from the treatment tank. A purification zone for purifying water to be treated provided between the discharge port and the introduction port, and a purification zone for separating the purification zone into a plurality of compartments. A plurality of perforated walls, each of which is made of at least one plate body in which a large number of through-holes are formed, and the perforated walls are located at a position against the flow of water to be treated. It is mainly preferable that oxygen-containing gas is sent to the inside through the porous wall. An aerobic compartment in which dissolved organic matter in the treated water is decomposed by anaerobic bacteria, and an anaerobic compartment in which solid organic matter in the treated water is mainly decomposed by anaerobic bacteria where oxygen-containing gas is not sent Are adjacent to each other, and when the apparatus is operated, a transition region is formed in the vicinity of the porous wall, in which organic substances in the water to be treated are mainly decomposed by air-permeable bacteria. Both the mouth and the discharge port are in communication with the uppermost stream side and the most downstream side aerobic section in the aerobic section, respectively.

  As preferred embodiments thereof, decomposition of soluble organic substances in the water to be treated by the aerobic bacteria, decomposition of solid organic substances in the water to be treated by the anaerobic bacteria, and decomposition of organic substances in the water to be treated by air-permeable bacteria And a decomposition apparatus for decomposing organic matter in the organic polluted water, in which the porous wall is provided in a sufficient number to repeat 3 to 20 times in combination. Moreover, as another preferable embodiment, any one of the above organic polluted water in which the aerobic compartment, the transition region, and the anaerobic compartment are combined and arranged in series along the inflow path of the water to be treated. And an organic substance decomposition treatment apparatus. Another preferred embodiment is an apparatus for decomposing organic matter in any one of the above organic polluted water, in which the porous walls are arranged substantially in parallel with a gap therebetween. Further, as another preferred embodiment, a solid substance reservoir is further provided at the bottom of the anaerobic compartment, and the solid substance accumulated in each solid substance reservoir is immediately seen in the direction of the inflow path of the water to be treated. The organic substance decomposition treatment apparatus in any one of the above-described organic polluted waters configured to be introduced into the aerobic compartment on the downstream side can be mentioned.

  In addition, the second embodiment of the apparatus of the present invention introduces organic polluted water of sewage mainly composed of organic matter or food-related factory effluent into the treatment tank as the treated water, and the treatment object is treated in the treatment tank. An apparatus for decomposing organic matter in organic polluted water for decomposing organic matter in water, wherein the treatment tank has an inlet to the treatment tank for treatment water and a position perpendicular to the inlet. An outlet for treating water from the inside of the treatment tank provided at the upper position and at least one air diffuser for intermittently sending oxygen-containing gas into the water to be treated in the treatment tank are provided. The aeration tube is below the vertical position of the introduction port, and an aerobic treatment region in which dissolved organic matter in the water to be treated is decomposed mainly by aerobic bacteria at the upper part of the treatment tank. Formed and treated water at the bottom of the treatment tank mainly by anaerobic bacteria Is an exploded processing device organic pollution in water of the organic substance, characterized in that the anaerobic treatment region at which the decomposition takes place in the solid organic matter is placed in position to be formed.

  As a preferred embodiment thereof, there is further provided means for intermittently sending a gas containing oxygen from the air diffuser into the water to be treated, and the means continuously diffuses the gas containing oxygen for 5 to 60 minutes. Then, the decomposition apparatus for decomposing organic matter in the organic polluted water, which is a control device that repeats the cycle 3 to 10 times with one cycle of stopping the aeration for 20 to 240 minutes, is given. It is done. In addition, oxygen-containing gas is intermittently sent into the treated water in the treatment tank below the vertical position of the diffuser pipe as the first diffuser pipe, and the treated water in the treatment tank is An organic matter decomposition treatment apparatus according to any one of the above, wherein at least one second air diffuser for mixing the whole is disposed. Further, means for intermittently sending oxygen-containing gas from the second air diffuser pipe into the water to be treated is provided, while the means performs air diffused by the first air diffuser pipe. In the above organic polluted water, which is a control device that repeats the aeration for 5 to 60 minutes 5 to 20 times at a rate of once every 5 to 10 times of the air diffused by the first air diffuser An organic substance decomposition treatment apparatus is exemplified.

  As a preferable embodiment thereof, there is further exemplified an organic matter decomposition treatment apparatus in organic polluted water according to any one of the above, wherein a plurality of the treatment tanks are connected in series. Further, as a preferred embodiment thereof, the apparatus for decomposing organic matter in the organic polluted water, in which a plurality of the air diffusers are spaced apart from each other and provided at substantially the same height, and the first air diffuser, A plurality of organic substance decomposition treatment apparatuses in the organic polluted water, wherein a plurality of second diffuser pipes are provided at substantially the same height and spaced apart from each other, and are provided at substantially the same height. It is done.

According to the present invention, organic polluted water such as sewage containing a high concentration of soluble organic matter and solid organic matter or food-related factory wastewater can be treated as it is without the need for pretreatment or dilution, Moreover, it does not cause the problem of excess sludge treatment, which is a disadvantage of the activated sludge process, and can dissolve solid organic matter as well as soluble organic matter in organic polluted water, and almost completely separates organic matter in organic polluted water with gas and water. A novel high-concentration organic polluted water treatment method and treatment apparatus that can be (H ₂ O) are provided.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention. In order to solve the above-described problems of the prior art, the present inventor purifies polluted water comprising a separating material for purifying polluted water in which a plurality of crushed stones described above are assembled, or a hollow body having a large number of openings on the surface. High-concentration organic wastewater mainly composed of organic matter such as sewage and food-related factory wastewater, such as soluble organic matter and solid organic matter, using a purification zone filled with components (hereinafter referred to as bulk purification materials) As a result of repeated investigations on the treatment (hereinafter also referred to as polluted water), an aerobic treatment region where degradation is mainly performed by aerobic bacteria, and an anaerobic treatment region where degradation is mainly performed by anaerobic bacteria, A transition region formed between the aerobic treatment region and the anaerobic treatment region, which is mainly decomposed by air-permeable bacteria, and forms a purification region in which the above three types of treatments are repeated a plurality of times. Sewage and food Organic polluted water such as wastewater from related factories can be treated as it is as treated water (without using bulk purification material, in the form of raw water). The inventors have found that most organic substances can be biodegraded and have arrived at the present invention.

  According to the prior art already proposed by the inventor described above, a purification zone is formed by filling the treatment tank with a bulk purification material, and the purification zone is subject to the activated sludge process. By circulating organic wastewater having a relatively low BOD value, it is possible to purify the organic wastewater without producing sludge. Such purification treatment is achieved by skillfully utilizing the action seen in the natural world, which the present inventors call separation. Here, the flow separation is a solid-liquid separation phenomenon caused by the magnitude of the flow existing in any water system.

  As a result of detailed studies by the present inventor, it is considered that the purification mechanism without producing sludge in the above method is as follows. When organic wastewater is introduced into a purification zone that is filled with a large amount of bulk purification material, a gentle flow in one direction is formed in the purification zone, but the flow in the purification zone in this case is not uniform, The space formed inside the bulk purification material forming the purification zone is in a state where the flow is substantially stagnant. In addition, a portion where the flow is substantially stagnated also occurs in the gap formed between the masses of the mass purification material. As a result of these segregation phenomena, SS in organic wastewater accumulates on the surface of the mass of the mass purification material facing the voids inside the mass purification material and the voids formed between the masses of the mass purification material. Is done. Then, SS in the organic waste water accumulated in the bulk purification material and on the surface stays in the place and becomes anaerobic, and as a result, is decomposed by anaerobic bacteria. For this reason, it is thought that the purification process of organic wastewater became possible, without generating sludge.

  The method for decomposing organic matter in the organic polluted water according to the present invention applies the biodegradation of organic matter, which is skillfully performed according to the magnitude of flow to soluble organic matter and solid organic matter, as described above, to various actual wastewaters. It was developed as a result of earnest examination about doing. That is, the present invention produces sludge by continuously flowing sewage or food-related factory effluent mainly composed of organic matter containing a high concentration of soluble organic matter and solid organic matter to a purification zone not filled with bulk purification material. It is an epoch-making method of organic polluted water that can decompose most of the organic matter in the water to be treated into water and gas.

According to the study of the present inventor, in order to biodegrade most of the soluble organic matter and solid organic matter contained in organic polluted water at a high concentration into gas and water, at least the following two basic requirements: It is necessary to provide a processing system configured to satisfy the above.
(1) An aerobic state, an anaerobic state, and a transition state in which an aerobic state and an anaerobic state are mixed are generated in the purification zone, and in these states, an aerobic bacterium, an anaerobic bacterium, and an aeration, respectively. The treatment is carried out in such a way that the degradation is carried out by a bacterial bacterium and the three units of the aerobic state, the transition state and the anaerobic state are repeated units and the unit is repeated a plurality of times.
(2) A soluble organic substance contained as a liquid in organic polluted water and a solid organic substance contained as a solid cause the liquid to stay in the purification zone in units of time, and the solid stays in the purification zone in units of days. Like that.

  That is, in the present invention, first, an aerobic treatment region in which dissolved organic matter is decomposed by aerobic bacteria, an anaerobic treatment region in which solid organic matter is decomposed by anaerobic bacteria, and water to be treated (organic A purification zone is formed so that a transition zone in which organic matter is decomposed by air-permeable bacteria is formed in the process of the distribution of the water (polluted polluted water) through the transition from the aerobic treatment zone to the anaerobic treatment zone, When the combination of the aerobic processing region, the anaerobic processing region, and the transition region is set to 1, three types of processing including these combinations are repeated a plurality of times. Furthermore, since the biodegradation of the soluble organic substance mainly performed in the aerobic treatment region is easily performed, the liquid constituting the water to be treated is allowed to stay in the purification region in units of time. In addition, the biodegradation of solid organic matter mainly performed in the anaerobic treatment area is partly decomposed and liquefied by anaerobic bacteria, and the liquefied organic substance is moved to the next aerobic treatment area. This is repeated by decomposing and liquefying a part of the remaining solid organic matter in the next anaerobic treatment region. For this reason, the solid organic matter is decomposed on a daily basis. Below, the structure of the specific purification zone used as the above-mentioned structure is demonstrated.

  The aerobic treatment region formed in the purification region used in the present invention can be easily formed by a method such as sending a gas containing oxygen from the lower part to diffuse (aerate). On the other hand, the anaerobic treatment region formed in the purification region can be easily formed by a method such as stopping aeration for sending a gas containing oxygen. As another method, an aerobic treatment region and an anaerobic treatment region are alternately formed by intermittent aeration in the same treatment region. Furthermore, in the above method, the transition region required in the method of the present invention is formed so that the aerobic treatment region and the anaerobic treatment region are adjacent to each other, and the treated water can flow through these treatment regions. Can be formed in the purification zone. Moreover, in the above-described method of intermittent aeration in the processing area, when continuous aeration for forming the aerobic processing area is stopped for a certain period of time, the period until the anaerobic processing area is subsequently formed becomes the transition area. Become.

  In the method according to the present invention, most of organic substances in sewage and food-related factory effluent containing soluble organic substances and solid organic substances at a high concentration of 100 mg / liter or more can be decomposed and purified without producing sludge. The mechanism will be described. In the process of examining in detail the purification mechanism of organic polluted water in the purification zone formed by filling a large number of the bulk purification materials described above, in the purification zone, A time difference was given to the flow behavior of water and solid, and it was found that this played an extremely important role in the purification process. First, in the purification zone formed by filling the bulk purification material, solid organic matter accumulates and accumulates in the inside of the bulk purification material or in the portion where the bulk of the bulk purification material contacts each other due to the flow-off phenomenon. On the other hand, even if oxygen-containing gas is sent to the purification zone filled with the bulk purification material by aeration, bio-oxidation by aerobic bacteria occurs in the whole or inside the bulk of the bulk purification material in the purification zone. However, depending on the situation where the mass purification material is placed in the purification zone, the inside and the surface of the mass of the mass purification material are not in a state where all aerobic bacteria can actively work, for example, Oxygen deficiency occurs between the diffusing tubes and between the diffusing tubes and in the part where the bacteria grows rapidly. Then, when such a state where oxygen is deficient occurs in the portion where the solid organic matter is accumulated and deposited, decomposition is performed by anaerobic bacteria, and as a result, purification is performed without producing sludge.

  In the present invention, utilizing the above phenomenon, in the purification zone in the treatment tank, an area where anaerobic decomposition as described above is performed is actively formed alongside the aerobic treatment zone, and in this purification zone, By flowing sewage containing a high concentration of organic matter and wastewater from food-related factories, both dissolved organic matter and solid organic matter are biodegraded to gas and water. In the processing method or processing apparatus according to the present invention, it is considered that organic polluted water purification is performed by the following mechanism.

  In the present invention, the water to be treated is first placed in the aerobic treatment region, and then flows through the transition region to the anaerobic treatment region. Therefore, first, the soluble organic matter in the water to be treated is carried to the aerobic treatment area by being flowed, decomposed by the aerobic bacteria in the treatment area, and the aerobic bacteria grow. In other words, in the aerobic treatment region, it can be said that the soluble organic matter changes into aerobic bacteria. On the other hand, the solid organic substance does not change at all while passing through the aerobic treatment region and the transition region, and is slowly conveyed to the anaerobic treatment region as it is. Since the flow of the liquid to be treated is small in the anaerobic treatment area where aeration is not performed, the solid organic matter is accumulated and deposited at the bottom of the anaerobic treatment area. As a result, the vicinity of the deposited solid organic matter becomes an anaerobic state, and a part of the surface of the solid organic matter is liquefied by anaerobic bacteria. In this case, the rest remains as solid organic matter. On the other hand, the aerobic bacteria grown in the aerobic treatment region are killed and self-degraded when flowing into the anaerobic treatment region. Therefore, in the present invention, these liquefied organic substances are configured to be carried to the aerobic treatment area, and the soluble organic substances are decomposed by aerobic bacteria in the next aerobic treatment area.

  As described above, since the solid organic matter accumulated and deposited at the bottom of the anaerobic treatment region does not all liquefy in a short period of time, it is necessary to repeat the above treatment a plurality of times. All the solid organic substances in the treated water can be biodegraded into soluble organic substances. That is, if it carries out as mentioned above, a solid organic substance will change to a soluble organic substance by anaerobic bacteria, and will be decomposed | disassembled by aerobic bacteria after that. For this reason, time of a day unit is required for decomposition | disassembly of a solid organic substance.

  In the present invention, the inflow amount of the water to be treated into the treatment tank is appropriately controlled by the amount of SS in the water to be treated. That is, in the case of treated water with a large amount of SS, the amount of inflow is reduced so that the residence time of the treated water in the treatment tank becomes longer. On the other hand, in the case of treated water with a small amount of SS, the amount of inflow into the treatment tank is increased to shorten the residence time of the treated water in the treatment tank. Specifically, for example, when treating water to be treated having a SS amount of about 100 to 250 mg / liter such as sewage, the inflow amount of the water to be treated is controlled so that the volume retention time is 10 to 20 hours. To do. When treating water to be treated with a large amount of SS such as wastewater from food-related factories of about 300 to several thousand mg / liter, the inflow amount of water to be treated is controlled so that the volume retention time is 20 hours to 5 days. To do.

  In the apparatus of the first embodiment of the present invention, for example, the solid organic matter 5 is accumulated in the pit (solid matter reservoir) 4 in the anaerobic region 2 so that the above-described decomposition by each bacterium is performed satisfactorily. (See FIGS. 1A, 1B, and 2). In the apparatus according to the second embodiment of the present invention, the solid organic matter 5 accumulates below the first air diffuser 36A provided in the vicinity of the middle stage of the treatment tank 30 (see FIG. 4B). The deposited solid organic matter 5 becomes anaerobic after a certain time, and a part of the solid organic matter 5 is liquefied to become a soluble organic matter. Accordingly, in the case of the apparatus shown in FIG. 1A or a modified example thereof shown in FIG. 1B (partially enlarged view shown in FIG. 2), the solid organic matter 5 collected intermittently in each pit 4 is pumped. Alternatively, it may be sucked by an air lift and moved to the next aerobic treatment region 1 so that the dissolved organic matter is decomposed by aerobic bacteria in the next aerobic treatment region 1.

  In the case of the apparatus shown in FIG. 4B, a second air diffuser 46B different from the first air diffuser 36A is provided near the bottom of the processing tank 30 (FIGS. 5A to 5D). 5 (C)), by aeration (aeration) by the second aeration tube 46B located on the lower side, the accumulated solid organic matter 5 is blown up on the upper first aeration tube 46A. The liquid to be processed in the tank is mixed (see FIG. 5C). In this way, the liquefied organic matter is decomposed by aerobic bacteria in the aerobic treatment region 1 formed on the upper first aeration tube 46A. When the aeration of the second diffuser tube 46B at the lower stage is stopped, the solid organic matter 5 again accumulates below the first diffuser pipe 46A at the upper stage (see FIG. 5B), and after a certain time, anaerobic It becomes the process area | region 2, and it occurs that a part of solid organic substance liquefies. Therefore, when the above-described treatment is repeated a plurality of times, the solid organic matter in the polluted water gradually becomes smaller while flowing through the purification zone, and eventually becomes gas and water. As a result, soluble organic substances and solid organic substances contained in the contaminated water at a high concentration are completely decomposed. Next, these embodiments will be described in more detail.

(Embodiment 1)
FIG. 1 (A) shows a schematic view of a treatment tank 10 in the treatment apparatus according to Embodiment 1 of the present invention. Basically, when the aerobic treatment region 1, the transition region 3 and the anaerobic treatment region 2 are formed in the treatment tank 10, and the combination of these treatment regions is a repeating unit (one treatment cycle), The purification zone is configured so that the treatment cycle can be repeated multiple times. In this aspect, as shown in FIG. 1 (A), a single plate having a plurality of through-holes is used as the porous wall 7, and such a plate crosses the flow of contaminated water. The inside of the processing tank is partitioned into a plurality of sections by being provided at a plurality of locations in the processing tank so as to be orthogonal to each other. As a result, the repeating unit of the aerobic processing region 1, the transition region 3, and the anaerobic processing region 2 is configured to be arranged a plurality of times on a straight line. The number of repetitions may be 3 to 20 treatment cycles, although it depends on the nature of the contaminated water to be treated. According to the study of the present inventor, for example, even in the case of sewage containing a high concentration of solid organic matter, such a repetitive unit is provided in the purification zone in a number that allows the combination of the above treatments for 3 to 10 cycles. If it processes in a processing tank, a favorable process can be performed. In this case, the inflow rate of the water to be treated into the treatment tank may be determined appropriately by monitoring the SS value of the water to be treated.

In the aerobic treatment region 1 provided in the purification region, for example, one or more straight pipes are laid at the bottom of the treatment tank 10 at right angles to the direction of the water to be treated, It can be easily formed by making a hole in the lower part or the like to form a diffuser tube 6 and continuously aeration through the air through the diffuser tube 6. In this case, it is preferable that the aeration is performed in a state where the momentum is suppressed so that the solid organic matter is not precipitated and the oil in the emulsion state is not separated. Specifically, the air may be sent at a constant speed of about 10 to 200 ml / min per m ^{2 of the} treatment tank 10. In the method of the present invention, the amount of air sent into the treatment tank may always remain constant, and the inside of the treatment tank 10 is controlled to an optimum purification environment by controlling the inflow speed of the water to be treated introduced into the treatment tank. can do.

  On the other hand, the anaerobic treatment region 2 provided in the purification region can be easily formed, for example, by simply non-aeration without laying such a diffuser tube. More specifically, the porous wall 7 is provided every 2 to 10 m, more preferably every 5 to 10 m, and the inside of the treatment tank 10 is divided into a plurality of rooms, and air is provided at the bottom of the compartment every other compartment. One or more diffusing pipes 6 may be laid in order to send the etc. into the treatment tank. By doing in this way, the aerobic processing area | region (aeration section) 1 in which the gas containing oxygen is fully sent in the processing tank 10, and the anaerobic processing area | region where the gas containing oxygen is not fully sent (Non-aerated section) 2 is formed. Further, these two types of compartments are adjacent to each other through a porous wall 7 and the polluted water flows between them. As a result, a transition region (region lacking oxygen) 3 is formed in the vicinity of the porous wall, and an aerobic treatment region (aeration section) 1, transition region 3, anaerobic treatment region (non-aeration region) The three types of aeration section 2) are repeated. In this embodiment, as shown in FIGS. 1 (A) and 1 (B), the treatment tank 10 is further connected so that both the introduction port 9A and the discharge port 9B communicate directly with the aerobic treatment region 1. It is preferable to constitute.

  In this Embodiment 1, it is preferable that the length ratio of each aerobic treatment area | region 1 and the anaerobic treatment area | region 2 in the flow direction of the to-be-processed water in the processing tank 10 shall be about 1: 1-1: 5. . However, the present invention is not limited to this, and the length ratio of the aerobic treatment region and the anaerobic treatment region may be changed depending on the SS concentration, BOD concentration, and COD concentration of the contaminated water to be treated. In the present invention, since it aims at decomposing all solid organic matter, it is preferable to change the length ratio of the aerobic treatment region and the anaerobic treatment region depending on the SS concentration. For example, when treating polluted water having a high BOD concentration and a high SS concentration, which is an indicator of soluble organic matter, it is preferable that the anaerobic treatment region 2 in the purification region is long. The length ratio between each aerobic treatment region 1 and the associated anaerobic treatment region 2 in the direction of the water to be treated in the treatment tank 10 is the corresponding porous wall provided in the purification region in the treatment tank 10. By appropriately determining the position of 7, it can be changed to a desired length ratio.

  Each porous wall 7 provided orthogonal to the flow of the polluted water may be composed of a single plate having a large number of through-holes as shown in FIG. As in the modification of FIG. 1 (A) shown in FIG. 1 (B), a plurality of such plate bodies, more specifically, two or three sheets are used as a set, and these are provided with a gap therebetween. They may be arranged in parallel. In this way, the purification zone of the treatment tank 20 is partitioned by the porous walls 27 each consisting of a plurality of plates, and a plurality of rooms partitioned by the porous walls 27 are alternately arranged as described above. 1. If the anaerobic treatment region 2 is used, the aerobic treatment region 1 and the anaerobic treatment region 2 can be more clearly partitioned, and a plurality of plates constituting each porous wall 27 Since the interval or the vicinity thereof is the transition region 3, more efficient processing can be performed. In each transition region 3, organic matter is biodegraded by air-permeable bacteria and flows into the next aerobic treatment region 1. The gap between the plates when forming each transition region using a plurality of plates as in the above modification may be about 10 to 50 cm.

  Furthermore, in Embodiment 1 of the present invention and its modification, as shown in FIGS. 1 (A) and 1 (B), the arrangement of the compartments is treated as aerobic (from the contaminated water introduction side). Repeat aerobic (non-aerated), aerobic (non-aerated), aerobic (non-aerated), transition / anaerobic (non-aerated) processes, and the final processing section becomes the aerobic processing area 1 Like that. Moreover, the size of a large number of holes provided in the plate constituting each porous wall is, for example, about 3 to 10 cm in diameter, and the number of holes is 5 to 40% of the degree of opening in the entire plate. It is preferable to constitute so that.

  When sewage or food-related factory effluent is introduced into the treatment tank 10 or 20 configured as described above as water to be treated, naturally, precipitation of solid organic matter occurs in each anaerobic treatment region 2 having no flow. The precipitate stays in the anaerobic treatment zone 2 longer than the water that passes freely through the porous wall 7. During this time, decomposition by anaerobic bacteria is performed and liquefaction of the solid organic matter proceeds. Furthermore, in each of the first embodiment and the modification thereof, as shown in FIG. 1A or FIG. 1B, a pit (solid matter reservoir) 4 is provided at the bottom of each anaerobic treatment section 2, The processing tank 10 or 20 is configured so that the solid organic matter 5 accumulated in the pit 4 is sucked by a fixed or movable sucking pipe at regular intervals and sent to the next aerobic processing region 1. Absorption may be performed by a pump or an air lift, and the interval between the absorptions is every 1 to 5 days.

  The purification mechanism of the polluted water in Embodiment 1 described above will be described together. In the purification area in the first embodiment, the aerobic treatment area 1, the transition area 3 and the anaerobic treatment area 2 are repeated, and when organic polluted water is circulated as treated water in the treatment tank 10, Water containing soluble organic matter stays in the time treatment area in units of hours, and solid organic matter stays in the time treatment area in days. For this reason, in the above-described purification zone, degradation by aerobic bacteria and degradation by anaerobic bacteria and aeration bacteria are efficiently performed, and since this is repeated, polluted water such as sewage containing a high concentration of solid organic matter Even if it is treated as it is, solid organic matter as well as soluble organic matter are decomposed into gas and water, and almost all organic matter in the polluted water is decomposed (see FIG. 3).

  FIG. 3 schematically shows how the solid organic matter in the water to be treated is decomposed in five stages (from the first stage to the fifth stage in the direction of the arrow). The first stage shows the state of the solid organic matter in the anaerobic treatment region 2 on the upstream side. In the treatment region 2, the cell membrane of the cell located on the surface of the solid organic matter is broken, and the cell is liquid. Turn into. The second stage shows the state of the solid organic matter in the aerobic treatment region 1 provided on the downstream side. In the treatment region 1, the solid organic matter is liquefied with aerobic water flowing around. Is washed, and the solid organic matter becomes smaller than that in the upstream anaerobic treatment region 2. Further, the third stage shows the state of the solid organic matter in the anaerobic treatment region 2 provided on the downstream side of the aerobic treatment region 1, and the treatment region 2 is located on the surface of the solid organic matter. The cell membrane of the cells is broken and the cells liquefy. The fourth stage shows the state of the solid organic matter in the aerobic treatment region 1 further downstream. In the treatment region 1, the liquefied portion of the solid organic matter is washed with aerobic water flowing around. The solid organic matter becomes even smaller. The fifth stage shows the state of the solid organic matter in the anaerobic treatment region 2 further downstream, but in the anaerobic treatment region 2, the cell membrane of cells located on the solid matter surface is torn and liquefied, Solid organic matter becomes even smaller. In addition, when soil, sand, clay, silt, or the like is contained in the contaminated water, it is not decomposed by the above-described method and apparatus according to the present invention, and thus needs to be removed from the treatment system. Since the purification mechanism of the water to be treated in the modification is the same as the purification mechanism in the first embodiment described above, the description thereof is omitted.

(Embodiment 2)
FIGS. 4A and 4B are schematic diagrams of a processing apparatus according to the second embodiment of the present invention and processing operations performed by the apparatus. As shown in these drawings, in the apparatus according to the second embodiment, processing is being performed in a processing tank 30 having an inlet 9A for organic polluted water that is to-be-treated water and a discharge port 9B for treated water. A first air diffuser 36A for intermittently sending oxygen-containing gas is provided in the water to be treated. The air diffuser 36A is below the vertical position of the inlet 9A, and the upper part of the treatment tank 30 is mainly decomposed by dissolved aerobic substances in the water to be treated by aerobic bacteria. An aerobic treatment region is formed, and an anaerobic treatment region is formed in the lower part of the treatment tank 30 so that the solid organic matter in the treated water is decomposed mainly by anaerobic bacteria. . That is, the air diffusion pipe 36A is not arranged near the bottom surface of the processing tank 30, but is arranged near the middle stage of the processing tank so that an anaerobic region is formed in the lower part of the processing tank 30 (FIG. 4). (See (A) and FIG. 4 (B)). Accordingly, the inlet 9A is provided above the vertical position of the first air diffuser 36A.

In the processing apparatus according to the second embodiment having the above-described configuration, the gas in the processing tank 30 is supplied by continuously supplying a gas (air or the like) containing oxygen into the processing tank 30 using the diffusion tube 36A. In the aerobic treatment region formed in the upper part, the dissolved organic matter in the water to be treated is decomposed mainly by aerobic bacteria, and in the anaerobic treatment region formed in the lower part of the treatment tank 30, the treatment is performed mainly by anaerobic bacteria. In the transition region where the solid organic matter in the water is decomposed and the aerobic treatment region and the anaerobic treatment region formed by the configuration of the treatment tank 30 and the continuous aeration are mixed, the ventilation is mainly performed. Decomposes organic matter by sexual bacteria. By proceeding with the treatment in these three types of treatment areas at a predetermined speed, the organic matter of organic polluted water, which is the water to be treated, is converted into gas and H without substantially needing to remove the solid organic matter from the treatment system. It can be decomposed into ₂ O. In addition, as a specific method of proceeding the processing in the three types of processing regions at a predetermined speed, continuous supply of a gas (air or the like) containing oxygen from the diffuser pipe 36A into the processing tank 30, that is, aeration This can be done by appropriately designing the timing. For example, when the organic polluted water that is to-be-treated water introduced into the treatment tank 30 contains solid organic matter at a higher concentration, the aeration from the air diffuser 36A shown in FIG. 4B is stopped. The decomposition of the solid organic matter 5 can be promoted by setting it to a long time.

  A preferred modification of the second embodiment will be described below with reference to FIGS. 5 (A) to 5 (C). In the apparatus of the illustrated modification, in addition to the diffuser tube 36A in the second embodiment (hereinafter referred to as the first diffuser tube 46A), the processing tank 40 below the vertical position of the first diffuser tube 46A is provided. Near the bottom surface, a second air diffuser 46B is disposed for intermittently sending a gas containing oxygen into the water to be treated in the treatment tank 40 and mixing the whole water to be treated in the treatment tank.

  In the processing apparatus according to the preferred modification of the second embodiment having the above-described configuration, the first aeration tube 46A and the second aeration tube 46B are used, and the aerobic formed in the upper part in the processing tank 40. In the treatment area, dissolved organic substances in the treated water are decomposed mainly by aerobic bacteria, and in the anaerobic treatment area formed in the lower part of the treatment tank 40, the solid organic substances in the treated water are mainly decomposed by anaerobic bacteria. And a transition region in which the aerobic treatment region and the anaerobic treatment region formed by the configuration of the treatment tank 40 and intermittent aeration described above are mixed, and mainly in water to be treated by air-permeable bacteria. Decompose organic matter.

  And when the combination of decomposition | disassembly in said 3 types of process area | region is set to 1, oxygen is supplied from the 1st diffuser tube 46A and the 2nd diffuser tube 46B in to-be-processed water so that the said combination may be repeated in multiple times. The gas to be treated is sent intermittently to mix the water to be treated in the treatment tank 40 (see FIG. 5C). In the processing apparatus according to the preferred modification of the second embodiment described above, as a specific means for intermittently sending the gas containing oxygen from the first and second air diffusers 46A and 46B into the water to be treated, a gas containing oxygen. It is preferable to provide a control device that can send the water into the water to be treated at a specific timing. A specific example of the timing will be described later with reference to FIG.

  In FIG. 6, as shown in FIGS. 5A to 5C, a first air diffuser 46 </ b> A and a second air diffuser 46 </ b> B for sending a gas containing oxygen are arranged in two upper and lower stages. The mode in the processing tank 40 at the time of processing using the apparatus by the preferable modified example of Embodiment 2 of this invention which has the one processing tank 40 which has is shown is shown. As time t elapses in the direction of the arrow, the state in the processing tank 40 is as shown in FIG. FIG. 6 shows the state of the treatment tank 40 at each time when air is intermittently diffused by the first air diffuser 46A and the second air diffuser 46B. Hereinafter, the processing tank shown in the upper left of FIG. 6 will be described in order.

  The polluted water introduced into the treatment tank 40 is aerobic in which oxygen-containing gas (air, etc.) is continuously diffused (aerated) from the first aeration tube 46A located in the upper stage of the treatment tank 40. In this state (ie, the aerobic treatment region 1), first, decomposition processing of soluble organic matter by aerobic bacteria proceeds. At that time, most of the solid organic matter floats or settles in an area where the aeration is not formed, which is formed below the first air diffuser 46A. Therefore, decomposition by anaerobic bacteria and air-permeable bacteria is performed near the bottom of the treatment tank. Advances. Next, when the air diffused from the first air diffuser 46A is stopped, the state in the treatment tank 40 becomes the transition region 3 where aerobic and anaerobic are mixed for a while, and the organic matter in the treated water is Subject to degradation by breathable bacteria. Thereafter, the inside of the treatment tank is in an anaerobic state without oxygen (that is, the anaerobic treatment region 2). In this state, since aeration is not performed, the flow in the treatment tank is gradually stopped, and the solid organic matter in the contaminated water is precipitated and accumulated. The precipitated solid organic matter becomes an anaerobic state, and the cell membrane of the cells on the surface of the solid organic matter is decomposed and liquefied by anaerobic bacteria. According to the study of the present inventors, in this case, 5 to 20% of the solid organic matter in the polluted water is liquefied. Next, air is diffused again from the first air diffuser 46A located in the upper stage in the processing tank 40, and in particular, the upper part in the processing tank 40 is brought into an aerobic state. As a result, the portion of the solid organic matter liquefied in the treatment tank 40 in an anaerobic state flows and is decomposed by aerobic bacteria.

  Next, the aeration from the first aeration tube 46A is stopped again to bring the inside of the treatment tank 40 into an anaerobic state, and as described above, the decomposition by the air-permeable bacteria and further the decomposition by the anaerobic bacteria proceed. Let In the processing described above, air is diffused only from the upper first air diffuser 46A, and air diffused from the second air diffuser 46B is stopped. Accordingly, since there is almost no flow between the first and second air diffusers 46A and 46B provided in the upper and lower two stages, the solid organic matter in the water to be treated is separated from the upper first air diffuser 46A and the lower second air diffuser 46A. Precipitates and accumulates with the air diffuser 46B. In the portion where the solid organic matter is deposited and deposited, the solid organic matter is constantly decomposed by aeration bacteria or anaerobic bacteria.

  In order to more efficiently perform the processing by the processing apparatus of the preferred modification of the present embodiment, as shown in FIG. 5C, in the middle of the processing, preferably in the middle of the processing in the aerobic state, A gas containing oxygen may be intermittently diffused from the lower second aeration tube 46B provided in the treatment tank 40, and the contaminated water in the treatment tank 40 may be intermittently mixed.

  Although the specific timing of the said process by the processing apparatus of the preferable modification of this Embodiment 2 is based also on the state of the to-be-processed water to process, the aeration of the 1st and 2nd aeration pipes 46A and 46B is the following. It is preferable to carry out at such timing. If it does in this way, the liquid or solid of to-be-processed water will come to stay in the processing tank 40 for the following different time, respectively. First, the first aeration tube 46A provided in the upper stage continuously diffuses the gas containing oxygen for 5 to 60 minutes, and then stops the aeration for 20 to 240 minutes in one cycle. The cycle is repeated 3 to 10 times. The total time during this period is an approximate residence time of the liquid portion of the water to be treated. That is, in the present invention, the energy to be introduced into the treatment tank 40 is very small, and the liquid portion in the treatment water moves through the treatment tank 40 by the energy generated by this intermittent aeration. Therefore, after treating the sewage with a treatment apparatus connected to five treatment tanks in Example 1 described later, after aeration with the first aeration tube 46A for 15 minutes in one treatment tank, the non-use for 30 minutes. When the aeration is repeated five times, the liquid portion in the water to be treated passes through the treatment tank 40 over approximately (15 + 30) minutes × 5 times × 5 = 1125 minutes (18.8 hours). It becomes.

  In the processing by the processing apparatus according to the preferred modification of the second embodiment, the processing tank 40 is configured as described above. Therefore, when air is diffused by the first air diffuser 46A as described above, one processing is performed. In the purification zone in the treatment tank 40, an aerobic treatment region 1 in which decomposition by mainly aerobic bacteria at the upper part of the tank is performed, an anaerobic treatment region 2 in which decomposition by mainly anaerobic bacteria is performed at the lower part of the tank, and Three types of treatment regions are formed, the transition region 3 where treatment with mainly air-permeable bacteria is performed. The liquid portion of the liquid to be treated stays in the treatment tank 40 for the time described above, and is mainly subjected to treatment with aerobic bacteria in the aerobic treatment region 1.

  In the processing by the processing apparatus of the preferred modification of the second embodiment, intermittent diffusion is performed also from the lower second diffusion tube 46B provided in the processing tank 40, and the above-described object in the processing tank 40 is processed. The treated water is intermittently brought into the mixed state 8. The specific timing is, for example, once every 5 to 10 times of the air diffused by the first air diffuser tube 46A provided in the upper stage, and 5 to 1 time from the second air diffuser pipe 46B provided in the lower stage. It is preferable to perform aeration for 60 minutes and repeat the aeration by the second diffusion tube 46B 5 to 20 times. The solid matter in the water to be treated is moved into the liquid by the energy of the intermittent air diffused by the second air diffuser 46B, and the remaining solid matter also moves in the treatment tank 40. To do. For this reason, it is difficult to obtain | require correctly the residence time in the processing tank 40 of a solid substance. Since it is clear that solids do not move without air diffused by the second air diffuser 46B, in the treatment apparatus connected to the five treatment tanks of Example 1 described later, solids in the water to be treated. Will stay in each treatment tank at least on a daily basis. In addition, the speed at which the water to be treated is introduced into the treatment tank 40 can be determined mainly by the above-described liquid residence time and the size of the treatment tank 40.

  Furthermore, in the second embodiment and its preferred modification, as described above, even if there is only one processing tank, three types of processing are performed: an aerobic processing area, an anaerobic processing area, and a transition area between these boundaries. It is possible to perform processing so that the combination of decomposition in the region is 1, and this combination is repeated a plurality of times. However, in order to perform more rapid processing, it is preferable to connect the processing tanks having the above-described configuration in series in three to five tanks.

<Example 1>
The two types of actual organic polluted water of sewage (SS = 200 mg / liter) and food factory effluent (SS = 1000 mg / liter) are used as treated water as they are (as raw water). Processing was carried out by introducing a processing apparatus or a processing apparatus having a preferred modification of Embodiment 2 into a processing apparatus in which five tanks were connected. In the case of sewage, the treatment was performed while circulating the sewage into the treatment tank so that the volume retention time was about 19 hours. In the case of food factory wastewater, the wastewater was treated while flowing into the treatment tank so that the volume retention time was 50 hours. Each processing condition is shown in Table 1. In Table 1, the meaning of 5 times / one tank or the like means that intermittent aeration was repeated 5 times for each tank under the conditions shown in the upper part.

As shown in Table 1, with respect to the actual polluted water described above, it was confirmed that the organic matter including the organic solid matter was almost completely decomposed into gas and H ₂ O. In particular, sludge was not generated in any treatment. In the case of sewage, inorganic sludge such as sand remained after treatment, but could be easily removed by precipitation separation. As a result, it was possible to obtain clear treated water free of suspended solids as in the case of food factory wastewater.

  As an application example of the present invention, it is possible to treat organic polluted water containing a high concentration of solid organic matter such as sewage or food-related factory wastewater as it is, and biodegrade most of the solid organic matter, In particular, a treatment method and a treatment apparatus for high-concentration organic polluted water that do not cause the problem of excess sludge treatment, which is a drawback of the activated sludge method, can be mentioned.

It is the schematic of processing operation of the organic polluted water by the processing tank in the processing apparatus by Embodiment 1 of this invention, and the processing apparatus of this Embodiment 1. FIG. It is the elements on larger scale of the processing tank of FIG. It is a typical schematic diagram for explaining progress of decomposition of solid organic matter in the present invention. It is the schematic of processing operation of the organic polluted water by the processing tank in the processing apparatus by Embodiment 2 of this invention, and the processing apparatus of this Embodiment 2. FIG. It is the schematic of processing operation of the organic polluted water by the processing tank in the processing apparatus by the preferable modification of Embodiment 2 of this invention, and the processing apparatus of this preferable modification. It is the schematic of the repetition treatment operation of the organic polluted water by the preferable modification of Embodiment 2 of this invention.

Explanation of symbols

1: aerobic treatment region 2: anaerobic treatment region 3: transition region 4: pit 5: solid organic matter 6, 36, 46: diffuser tube 7, 27: porous wall 9A: inlet 9B: outlets 10, 20, 30, 40: treatment tank

Claims (15)

  In the method for decomposing organic matter in organic polluted water, in which the organic polluted water from the sewage or food-related factory effluent mainly composed of organic matter is treated water, the organic matter in the treated water is decomposed in the purifying zone. In the aerobic treatment region formed in the aerobic bacteria, the dissolved organic matter in the treated water is decomposed mainly by aerobic bacteria, and in the anaerobic treatment region formed in the purification zone, the solid organic matter in the treated water is mainly treated by anaerobic bacteria. In the transition region formed at the boundary between the aerobic treatment region and the anaerobic treatment region through which the treated water circulates, the organic matter in the treated water is decomposed mainly by air-permeable bacteria, When the combination of decomposition in the aerobic treatment area, the anaerobic treatment area, and the transition area is 1, the combination is repeated a plurality of times, and further in the purification area. Cracking process of organic pollution of water organic matter, characterized in that none of the first process and the final process is aerobic treatment.   The method for decomposing organic matter in organic polluted water according to claim 1, wherein the number of repetitions is 3 or more and 20 or less.   The decomposition | disassembly processing method of the organic substance in organic polluted water of Claim 1 or 2 with which the frequency | count of the said repetition is performed linearly sequentially along the inflow path | route of to-be-processed water.   Introducing organic contaminated water from sewage or food-related factory effluent mainly composed of organic matter into the treatment tank, and decomposing the organic matter in the treated water in the treatment tank An organic matter decomposition treatment apparatus, wherein the treatment tank includes an introduction port into the treatment water treatment tank, a treatment water discharge port from the treatment tank, and between the discharge port and the introduction port. A purification zone for purifying the treated water while circulating the water to be treated, and a plurality of porous walls provided to be separated from each other in the purification zone in order to divide the purification zone into a plurality of sections The porous wall is composed of at least one plate body in which a large number of through-holes are formed, and the porous wall is disposed at a position against the flow of the water to be treated, through the porous wall, Dissolution in the water to be treated by mainly aerobic bacteria to which oxygen-containing gas is sent. An aerobic compartment where decomposition of organic substances is performed and an anaerobic section where decomposition of solid organic matter in the water to be treated by mainly anaerobic bacteria to which oxygen-containing gas is not sent are combined and adjacent to each other. During the operation, a transition region is formed in the vicinity of the porous wall where organic substances in the water to be treated are mainly decomposed by air-permeable bacteria, and both the introduction port and the discharge port are An apparatus for decomposing organic matter in organic polluted water, wherein the apparatus is in communication with the aerobic compartment on the most upstream side and the most downstream side in the aerobic compartment.   Three or more times 20 in combination of decomposition of dissolved organic matter in the water to be treated by the aerobic bacteria, decomposition of solid organic matter in the water to be treated by the anaerobic bacteria, and decomposition of organic matter in the water to be treated by air-permeable bacteria. 5. The apparatus for decomposing organic matter in organic polluted water according to claim 4, wherein a sufficient number of the porous walls are provided so as to be repeated less than once.   The apparatus for decomposing organic matter in organic polluted water according to claim 4 or 5, wherein the aerobic compartment, the transition region, and the anaerobic compartment are combined and arranged in series along the inflow path of the water to be treated. .   The apparatus for decomposing organic matter in organic polluted water according to any one of claims 4 to 6, wherein the porous walls are arranged substantially in parallel with a gap therebetween.   Furthermore, a solid substance reservoir is provided at the bottom of the anaerobic compartment, and the solid matter accumulated in each solid substance reservoir can be introduced into the aerobic compartment immediately downstream as viewed in the direction of the inflow path of the water to be treated. The decomposition processing apparatus of the organic substance in the organic polluted water of any one of Claims 4-7 comprised as follows.   Introducing organic contaminated water from sewage or food-related factory effluent mainly composed of organic matter into the treatment tank, and decomposing the organic matter in the treated water in the treatment tank An organic matter decomposition treatment apparatus, wherein the treatment tank includes an inlet into the treatment tank of the water to be treated and a treatment from the treatment tank provided at a position above the vertical position of the inlet. A water discharge port and at least one air diffuser for intermittently sending oxygen-containing gas into the water to be treated in the treatment tank are provided, and the air diffuser is disposed at a position perpendicular to the inlet. An aerobic treatment region is formed in the upper part of the treatment tank where the dissolved organic matter in the treated water is decomposed mainly by aerobic bacteria, and the lower part of the treatment tank is covered mainly by anaerobic bacteria. Anaerobic where decomposition of solid organic matter in treated water occurs Decomposition processor of organic pollution of water organic matter, characterized in that it is arranged at a position management area is formed.   Furthermore, means for intermittently sending oxygen-containing gas from the diffuser pipe into the water to be treated is provided, and after the means continuously diffuses oxygen-containing gas for 5 to 60 minutes, The apparatus for decomposing organic matter in organic polluted water according to claim 9, wherein the apparatus is a control device that stops the aeration for 20 to 240 minutes as one cycle and repeats the cycle 3 to 10 times.   Furthermore, oxygen-containing gas is intermittently sent into the treated water in the treatment tank below the vertical position of the diffuser pipe as the first diffuser pipe, and the whole treated water in the treatment tank is The apparatus for decomposing organic matter in organic polluted water according to claim 9 or 10, wherein at least one second air diffuser for mixing is disposed.   Furthermore, means for intermittently sending oxygen-containing gas from the second air diffuser into the water to be treated is provided, and while the means is performing air diffused by the first air diffuser, The organic pollution according to claim 11, which is a control device that repeats the aeration for 5 to 60 minutes 5 to 20 times at a rate of 1 to 5 to 10 times of the air diffused by one air diffuser. Decomposition treatment equipment for organic substances in water.   Furthermore, the decomposition processing apparatus of the organic substance in the organic polluted water of any one of Claims 9-12 formed by connecting the said processing tank in multiple numbers in series.   The apparatus for decomposing organic matter in organic polluted water according to claim 9, wherein a plurality of the air diffusers are spaced apart from each other and provided at substantially the same height. 10. The organic material according to claim 9, wherein a plurality of the first air diffuser tubes are spaced apart from each other and provided at substantially the same height, and a plurality of the second air diffuser tubes are spaced apart from each other and provided at substantially the same height. Equipment for decomposing organic matter in water.

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