JP2007196081A - Wastewater treatment system and toilet arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment system capable of efficiently treating excrement and urine, and miscellaneous drainage; and a toilet arrangement using it. <P>SOLUTION: The wastewater treatment system comprises a urine discharge part 10 for discharging urine-containing drainage in a state being separated from the excrement, a urine nitrification part 51 for nitrifying the urine-containing drainage to be supplied from the urine discharge part 10 by a microbe under an aerobic condition, and a denitrification part 150 for denitrifying the urine-containing drainage nitrified at the urine nitrification part 51 and drainage containing a BOD source by a microbe under an anaerobic condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wastewater treatment system and a toilet device.

A system using a septic tank is known as a treatment method for human waste and wastewater containing BOD sources other than human waste (for example, daily wastewater such as kitchen wastewater, washing machine wastewater, and bath wastewater). In the septic tank, when the purpose is to remove nitrogen components contained in a large amount of wastewater including manure wastewater and wastewater containing BOD sources (for example, 200 to 250 L / day / person), mainly microorganisms Biological nitrification and denitrification methods that utilize nitrogen nitrification and denitrification reactions are widely used.
Kohei Inamori, Domestic Wastewater Countermeasure Handbook, December 1998, Industrial Water Research Committee, pp158-161 Septic tank maintenance, third edition, Japan Environmental Education Center, July 1999, pp20-21

  In a conventional septic tank, wastewater containing BOD sources other than human wastewater and human waste is treated together. Therefore, the amount of water to be treated increases (for example, about 200 to 250 L / (day / person)) and the water to be treated is diluted.

  Under such conditions, when nitrification of nitrogen components and removal of nitrogen by denitrification are to be achieved, the BOD source in the water to be treated is also decomposed and disappeared in the treatment process for promoting nitrification, and nitrogen is removed. In principle, it was difficult to create an environment in which a large amount of BOD source is present in the water to be treated, which is ideal for high removal, and the nitrification of the nitrogen component is sufficiently advanced. For this reason, when wastewater with a relatively high nitrogen concentration is treated in the septic tank, it is difficult to efficiently nitrify and denitrify the nitrogen component at the same time while achieving removal of the pollutant component indicated by BOD. .

  In other words, since aeration is performed in a state where the nitrogen component and the BOD source are mixed, the BOD source is oxidized simultaneously with the nitrification of the nitrogen component. For this reason, since the nitrified nitrogen component is denitrified (reduced), the necessary BOD source may be insufficient. In order to solve this problem, an excessive burden has been required on both sides of the apparatus and operation, such as circulation of treated water and time adjustment of aeration.

  The present invention has been made in view of the above problems, and an object thereof is to provide a wastewater treatment system capable of efficiently denitrifying wastewater containing urine and a BOD source, and a toilet device used therefor. .

  The present inventors have found that most of the nitrogen component (for example, about 80%) is derived from manure in manure and domestic wastewater, and moreover, about 90% of the nitrogen component in manure and urine is derived from urine. Focusing on this, the present invention has been conceived.

  A wastewater treatment system according to the present invention includes a urine discharge part that discharges urine-containing wastewater in a state separated from urine, and a urine nitrification part that nitrifies urine-containing wastewater supplied from the urine discharge part with microorganisms under aerobic conditions; And a denitrification unit that denitrifies urine-containing wastewater nitrified in the urine nitrification unit and wastewater containing a BOD source by microorganisms under anaerobic conditions.

  According to this, urine in which nitrogen content is particularly concentrated among waste water containing BOD sources and manure discharged from homes, etc., is separated from waste water containing BOD sources such as wastewater and household wastewater. Nitrification is performed in advance in the nitrification section. In particular, since urine is separated from sputum, the generation of odor is suppressed, and since urine is separated from wastewater containing BOD sources such as daily wastewater, the amount of water is small, and nitrogen components such as urea and ammonia Can be easily converted into nitrite nitrogen and nitrate nitrogen by microorganisms. Furthermore, nitrate and nitrite nitrogen generated by nitrification of urine is supplied to the denitrification unit. Denitrification using nitrate and nitrite nitrogen and waste water containing a BOD source as a raw material and removal of the BOD source accompanying this are compared to denitrification and BOD source removal using ammonia nitrogen and a BOD source as raw materials. It is done very quickly. Therefore, denitrification and removal of the BOD source are performed very efficiently in the septic tank. For this reason, nitrogen and BOD sources can be treated very efficiently for wastewater containing BOD sources in the entire wastewater treatment system (for example, household wastewater such as kitchen wastewater, bathroom wastewater, and washing machine wastewater) and urine. it can.

  Here, the wastewater containing the BOD source supplied to the denitrification unit preferably does not contain urine, but the invention can be implemented even if it contains urine.

  Here, as the urine drainage unit, the urinal toilet, the urine separation toilet that discharges the excreted urine without mixing with the urine, and the solid liquid that separates the mixture of the urine and urine into solid and liquid and discharges the urine-containing wastewater At least one of the separators can be exemplified.

  In addition, when the urine discharge unit is a manure separation toilet or a solid-liquid separator, soot discharged in a state separated from urine from the manure separation toilet or the solid-liquid separator may be supplied to the denitrification unit. preferable. In this case, denitrification can be performed efficiently by using a BOD source abundantly contained in the soot.

  On the other hand, when the urine discharging part is a manure separation toilet or a solid-liquid separator, it is preferable to further include a stirring part. The stirring unit mixes and stirs the sputum discharged in a state separated from the urine from the manure separation toilet or the solid-liquid separator with the porous material.

  In this case, since the soot is processed in a dry manner by a stirrer separate from the septic tank, the processing load in the septic tank can be reduced, which is preferable. The soot treated in the stirrer can be used as compost or the like.

  Further, the urine nitrification unit can suitably perform nitrification if it has aeration means for aeration of the urine-containing wastewater.

  In addition, it is preferable that a pre-denitrification unit that denitrifies the urine-containing wastewater supplied from the urine discharge unit is further provided in front of the denitrification unit.

  If the urine is denitrified in advance by using nitric acid and nitrite nitrogen generated by nitrification by using a pre-denitrification tank or the like, the denitrification load in the denitrification section, which is the latter stage, can be reduced.

  In addition, it is also preferable to further include a phosphorus removing unit that removes phosphorus in the urine-containing wastewater supplied from the urine discharging unit in the preceding stage of the denitrification unit.

  As a phosphorus removal part, the porous filter medium which can adsorb | suck a phosphorus component, and an electrolysis means are mentioned, for example.

  In addition, the urine treatment apparatus preferably further contacts the separated urine with a pH buffer material containing calcium carbonate such as oyster shell, straw, limestone, or the like.

  According to this, it can suppress that the pH of urine falls by progress of nitrification, and can suppress the fall of the activity of the microorganisms for nitrification.

  The denitrification unit is preferably a septic tank. In particular, a septic tank having an anaerobic tank and an aerobic tank connected to the anaerobic tank is preferable. In this case, it is preferable to supply the urine-containing wastewater nitrified in the urine nitrification unit to the anaerobic tank.

  On the other hand, the denitrification unit may be a sewage pipe. Also in this case, denitrification is preferably performed, and an existing sewage pipe can be used, which is preferable.

  In addition, the denitrification unit to which the wastewater containing the BOD source is supplied may be supplied with the wastewater from the bath, but the filtration unit that contacts the soil without supplying the drainage from the bath to the denitrification unit is further provided. You may prepare.

  According to this, since the waste water containing the BOD source can be treated without flowing into the septic tank, the bath effluent having a particularly small nitrogen component and BOD source and a large volume can be treated, so that the treatment load of the septic tank can be reduced.

The toilet device according to the present invention includes a urine discharge unit that discharges urine-containing wastewater in a state separated from the urine, and a urine nitrification unit that nitrifies urine-containing wastewater supplied from the urine discharge unit.
Prepare.

  According to this, the toilet apparatus suitable for the above-mentioned wastewater treatment system can be provided. Such a toilet device can be easily connected to a conventional septic tank.

  Here, the urine discharge unit discharges the urine-containing wastewater by solid-liquid separation of the urine toilet, the waste urine separation toilet that discharges the excreted urine as urine-containing wastewater without mixing with the urine, and the mixture of urine and urine Preferably, it is at least one of the solid-liquid separators.

  The urine nitrification part preferably has aeration means for aeration of the urine-containing wastewater.

  Furthermore, the urine nitrification unit has a urine tank that stores the urine-containing wastewater discharged from the urine discharge unit, and further, a urine discharge pipe that discharges urine from the urine separation toilet and spills liquid that overflows from the urine tank It is preferable to include a urine junction tube that joins the tube.

  In such a toilet device, since only one exit from the toilet device is required, it is particularly easy to realize the waste water treatment system by exchanging with a conventional toilet device.

  ADVANTAGE OF THE INVENTION According to this invention, the waste water treatment system which can perform the efficient process of manure and domestic wastewater, and the toilet apparatus used for this are provided.

  FIG. 1 is a flowchart showing a wastewater treatment system 200 according to the first embodiment. The wastewater treatment system 200 mainly includes a septic tank (denitrification unit) 150, a toilet device 100, and a soil filtration device 190.

  The toilet device 100 mainly includes a urine separation toilet 10 and a urine processing device 50. The urine separation toilet 10 discharges the excreted urine in a state separated from the urine as urine-containing wastewater without mixing with the urine. The urine-containing wastewater discharged from the urine separation toilet 10 is supplied to the urine processing device 50 via the line L1. As will be described later, the urine treatment device 50 has a urine nitrification unit 51 and, if necessary, a dephosphorization unit 52 and a preliminary denitrification unit 53, and nitrification and dephosphorization of urine-containing wastewater. Denitrification is performed.

  Here, the urine-containing wastewater is wastewater containing urine but substantially free of soot (solid content). For example, urine alone may be used, and a mixture of urine and washing water for washing may be exemplified.

  The nitrification action by the urine nitrification unit 51 is achieved by, for example, efficiently contacting oxygen-containing gas such as air or oxygen-enriched air with urine-containing wastewater by operations such as aeration (aeration) and stirring. What is necessary is just to carry out by an effect | action. Nitrogen components such as urea in urine-containing wastewater change to nitrite nitrogen and nitrate nitrogen via ammonia nitrogen by nitrification.

  The dephosphorization action by the dephosphorization unit 52 can be performed by, for example, an adsorption method in which a porous filter medium is brought into contact with and adsorbs urine-containing wastewater, or an electrolysis method in which iron or aluminum is removed by an electrolytic means using electrodes. In addition, the dephosphorization action in the urine processing apparatus 50 is not essential.

  What is necessary is just to perform the denitrification effect | action of the wastewater containing urine by the prior denitrification part 53 by anaerobic bacteria in an anaerobic environment, for example.

  The urine-containing wastewater that has been nitrified or dephosphorized by the urine treatment device 50 is supplied to the septic tank 150 via a line L3. Moreover, the wastewater containing waste liquid separated and discharged from the urine separation toilet 10 is also sent to the septic tank 150 via the line L2. Further, waste water containing the BOD source from the kitchen D is also supplied to the septic tank 150 via the line L10.

  In the septic tank 150, denitrification by anaerobic microorganisms, nitrification of an unnitrified ammonia nitrogen component by aerobic microorganisms, and the like are performed.

  In denitrification, nitrite and nitrate nitrogen produced by nitrification of urine in the denitrification section 51 mainly under anaerobic conditions are used as BOD sources (organic matter) in straw and kitchen wastewater. Utilized and reduced to nitrogen by anaerobic microorganisms.

  In nitrification, unnitrified ammoniacal nitrogen is oxidized to nitrate and nitrite nitrogen by aerobic microorganisms. Specifically, an oxygen-containing gas such as air may be brought into contact with the waste water by aeration or the like.

  Drainage from the bath B passes through the soil filtration device 190. The soil filtration device 190 is a filtration device having soil such as a aggregate filter medium as a packed bed. Drainage from bath B, which has a low nitrogen content and BOD source, is easily purified by such treatment.

  In addition, although illustration is abbreviate | omitted, although the waste_water | drain from a washing machine and the waste_water | drain from a washroom may be supplied to the denitrification tank 130, since these also have few contaminating components, supplying to the soil filtration apparatus 190 is preferable. In addition to wastewater from the kitchen D, wastewater containing organic matter serving as a BOD source, such as wastewater containing organic matter serving as a BOD source, such as wastewater containing organic matter such as kitchen wastewater from a business establishment, is supplied to the septic tank 150. be able to.

  Next, a specific example of the toilet apparatus 100 will be described with reference to FIG.

  The toilet device 100 in FIG. 2 is an integrated unit of the urine separation toilet 10 and the urine processing device 50, and includes a urine separation toilet 10, a water tank 24, a line L1 as a urine discharge tube, and a line as a urine discharge tube. L2, the line L3 as a urine merging tube, and a urine processing device 50 are mainly provided. The urine treatment device 50 includes a urine tank 30, an air diffuser 42, a blower 44, a filter medium 55, a cover 48, a vent 48b, and the like.

  The urine separation toilet 10 has a dent 10a and a dent 10b. The urine is received by the dent 10a while the urine is received by the dent 10b. Thus, the discharged sputum and urine can be discharged separately without being mixed with each other. A line L1 is connected to the bottom of the recess 10a, and the received urine is guided into the urine tank 30 as urine-containing waste water. Preferably, the urine-containing wastewater is a mixture of urine and a small amount of water (for example, about 0.1 L / time) from the water tank 24. It may be contained wastewater.

  In the urine tank 30, an air diffuser 42 is provided. Air is supplied from the blower 44 through the line 46 to the air diffuser 42. Note that an oxygen-containing gas other than air, such as oxygen-enriched air generated by an oxygen generator, may be supplied from the blower 44. The air diffuser 42, the line 46 and the blower 44 constitute an aeration means 47. In addition, the urine tank 30 and the aeration means 47 constitute a urine nitrification unit 51. As a result, bubbles of oxygen-containing gas are generated in the urine tank 30, the urine-containing wastewater is maintained in an aerobic atmosphere, and nitrogen components derived from urine pass through ammonia nitrogen and nitrous acid by aerobic microorganisms in the urine tank 30. And oxidized to nitrate nitrogen.

  A filter medium 55 is disposed in the urine tank 30. Examples of the filter medium 55 include a porous filter medium and a non-porous filter medium.

  The porous filter medium is also called a nodule filter medium, for example, baked red crust, Kanuma soil, zeolite, pumice, black box soil, shirasu soil sintered body, Ryukyu lime, bagasse charcoal, ceramics porous granular material Examples include filter media. With such a porous filter medium 55, nitrification microorganisms can be fixed to promote nitrification, and phosphorus in urine can be recovered by adsorbing the porous filter medium 55. Here, the porous filter medium constitutes the dephosphorization part 52.

  Examples of the non-porous filter medium include plastic fillers, but it is preferable to use a pH buffer material containing calcium carbonate, such as a shell (such as oyster shell). If the urine becomes acidic due to nitrification of urine, the growth of microorganisms for nitrification may be inhibited in the urine tank 30, but the nitrification action can be further promoted by suppressing the fluctuation of pH by this pH buffer material. It is. Of course, a porous filter medium and a non-porous filter medium may be mixed.

  Such a filter medium 55 is accommodated in a filter medium container 56 made of resin mesh or the like. Further, the upper portion of the urine tank 30 is covered with a cover 48. At the upper end of the cover portion 48, an openable / closable lid portion 48a and a vent hole 48b are installed. The filter medium container 56 of the filter medium 55 is provided with a hook 57, and this hook 57 is caught by the edge of the opening of the lid portion 48a. Thereby, it is easy to replace the filter medium 55 every predetermined period. Needless to say, the filter medium 55 may be filled directly into the urine tank 30 without the filter medium container 56. In addition, since the used porous filter medium 55 contains abundant phosphorus, it can be reused as a soil conditioner such as a fertilizer.

  A part of the side surface of the urine tank 30 is a weir 30a capable of overflowing nitrified or dephosphorized urine, and the overflowed treated urine-containing wastewater flows through a line L3 (urine merging pipe). So that it merges with the line L2.

  From the manure separation toilet 10, the wastewater containing manure is discharged in a state separated from urine. The soot-containing wastewater is supplied to the denitrification tank 130 of the septic tank 150 through a line L2 bent into a U shape. In the present embodiment, the excreted soot is swept away by a small amount of water (for example, about 4 L / time) from the water tank 24 and flows into the septic tank 150 via the line L2.

  The use of such a urine separation toilet 10 is preferable because the amount of water used in the toilet is reduced, and can be, for example, about 1/8 of the conventional type 50 L / (day / person). This saving amount is about 20% of the average total wastewater 200L / (day / person) at home.

  Next, an example of the septic tank (denitrification unit) 150 will be briefly described with reference to FIG. The septic tank 150 mainly includes a first denitrification layer 130, a second denitrification tank 131, and a nitrification tank 140. The wastewater containing waste separated by the toilet 10 flows into the first denitrification tank 130 via the line L2, and the urine containing wastewater nitrified by the urine treatment device 50 flows into the first denitrification tank 130 via the line L3. The waste water containing the BOD source from the kitchen D flows into the first denitrification tank 130 via the line L10.

  The first denitrification layer 130 and the second denitrification tank 131 are filled with a porous or non-porous filter medium 135. The nitrification tank 140 is filled with a porous or non-porous filter medium 145. Further, the nitrification tank 140 is provided with an air diffuser 165 that is connected to the blower 160 and diffuses an oxygen-containing gas such as air. Further, a line L8 and a pump 170 for returning a part of the waste water in the nitrification tank 140 to the first denitrification tank 130 are provided.

  The first denitrification layer 130 and the second denitrification tank 131 are maintained under anaerobic conditions, and the nitrate and nitrite nitrogen generated mainly in the urine treatment apparatus 50 and the nitrification tank 140 are reduced by anaerobic microorganisms in the filter medium. That is, denitrification and accompanying decomposition of the wastewater containing BOD sources such as kitchen wastewater and the BOD sources derived from dredging are performed.

  In the nitrification tank 140, nitrification of unnitrified ammoniacal nitrogen is performed by microorganisms in the aerobic filter bed.

  Note that the present invention can also be implemented by arranging the nitrification tank 140 at the front stage and the denitrification tanks 130 and 131 at the rear stage. In this embodiment, denitrification by anaerobic treatment and nitrification by aerobic treatment are performed in different tanks. For example, only one tank 140 is provided without the tanks 130 and 131 of FIG. Nitrification and denitrification may be carried out using a septic tank having In this case, by performing intermittent aeration with the diffuser 165, denitrification under anaerobic conditions and nitrification under aerobic conditions can be performed batchwise.

  Next, as another example of the toilet apparatus 100, an apparatus in which the urine processing apparatus 50 is installed apart from the urine separation toilet 10 will be described with reference to FIG. The urine treatment device 50 mainly includes a pre-denitrification tank 31 (pre-denitrification unit 53), a first nitrification tank 32, and a second nitrification tank 33. The pre-denitrification tank 31 is filled with a porous filter medium (dephosphorization section) 57 such as a aggregate filter medium, and the urine-containing wastewater discharged from the urine separation toilet 10 is supplied via the line L1. It is preferable that the line L1 supplies urine-containing wastewater to the lower part of the preliminary denitrification tank 31 and causes the treated urine to overflow into the first nitrification tank 32.

  The first nitrification tank 32 is connected to a denitrification tank 31 and receives treated urine-containing wastewater from the denitrification tank (denitrification unit) 31. The second nitrification tank 33 is connected to the first nitrification tank 32 and receives the urine-containing wastewater supplied from the first nitrification tank 32. The first nitrification tank 32 and the second nitrification tank 33 correspond to the urine nitrification part and part.

  The first nitrification tank 32 and the second nitrification tank 33 are provided with a diffuser pipe 42 connected to the blower 44. The first nitrification tank 32 and the second nitrification tank 33 are filled with a filter medium 55, for example, a porous filter medium or a pH buffer material containing calcium carbonate. Further, a part of the treated urine-containing waste water in the second nitrification tank 33 is supplied to the pre-denitrification tank 130 of the septic tank 150 via the line L3, while the rest is supplied to the pre-denitrification tank 31 via the line L7 and the pump 38. Recycled.

  In the preliminary denitrification tank 31, denitrification and decomposition of organic substances are performed by the anaerobic filter bed by the BOD source in urine and the nitrite and nitrate nitrogen recycled from the second nitrification tank 33. In the pre-denitrification tank 31, phosphorus is adsorbed by the porous filter medium 51.

  In the first nitrification tank 32 and the second nitrification tank 33, nitrification of ammonia nitrogen is performed by an aerobic filter bed. The recycling by the line L7 is performed so that, for example, the number of circulation of the urine-containing wastewater is about 2 to 4 so that the concentration of ammoniacal nitrogen at the outlet of the second nitrification tank 33 is reduced to about 5 mg / L. It is preferable to set.

  Thus, before flowing into the septic tank 150, the urine-containing wastewater is treated not only by the nitrification tanks 32 and 33 that perform nitrification, but also by the urine treatment device 50 provided with the preliminary denitrification tank 31, thereby removing the urine from the septic tank 150. There is an advantage that the nitrogen load can be further reduced.

  As described above, according to the wastewater treatment system 200 according to the present embodiment, urine in which nitrogen content is concentrated in various wastewaters is discharged in a state separated from the urine by the urine separation toilet 10, Furthermore, it is nitrified in advance in the urine treatment apparatus 50 without being diluted with a large amount of BOD source-containing wastewater such as kitchen wastewater. Here, in particular, since the urine is separated from the urine, the generation of odor in the urine treatment device 50 is suppressed, and the urine is separated from the daily wastewater and the amount of water remains small. Nitrogen components such as urea and ammonia can be easily changed to nitrite nitrogen and nitrate nitrogen by a small device. Specifically, since the amount of urine processed in the urine processing apparatus 50 is, for example, about 1 to 2 L / (day / person), the capacity of the urine processing apparatus 50 is extremely large even if water for washing is included. It can be small. In addition, since urine has a small amount of SS (solid content), and there is almost no trouble with sediment or solid nitrogen content, the urine treatment device 50 may be very simple from this point of view. it can.

  Further, nitrate nitrogen and nitrite nitrogen generated by nitrification of urine are supplied to the denitrification tank 130 of the septic tank 150 and mixed with other BOD-containing wastewater. Since denitrification and BOD removal using nitrate and nitrite nitrogen and BOD source as raw materials are performed more rapidly than denitrification and BOD removal using ammonia nitrogen and BOD source as raw materials, a septic tank The removal and denitrification of the BOD source is performed very efficiently in 150 denitrification tanks 130 and the like. For this reason, the treatment of nitrogen and BOD in the entire waste water treatment system 200 can be performed very efficiently.

  Therefore, the capacity of the septic tank 150 can be extremely small. For example, an existing single septic tank can be diverted as the septic tank 150 of this embodiment. In this case, it is only necessary to replace the toilet device 100 and supply wastewater containing BOD sources such as daily wastewater to the denitrification tank 130 of the septic tank 150. Therefore, remodeling costs can be suppressed, and the quality of the treated wastewater is merged. It can be very high, equivalent to or higher than the septic tank. In addition, the power cost for the blower or pump can be reduced.

  Further, phosphorus can be removed by the porous filter medium 52 in the urine treatment apparatus 50. In addition, the drainage of bath B, which has a large amount of water but a relatively small amount of nitrogen and BOD sources, is processed by the soil filtration device 190 without being put into the septic tank 150, so that the efficiency of the wastewater treatment in the septic tank 150 is further improved. It is possible. For example, the drainage of the bath is, for example, about 40 L / (person / day), so the reduction effect is great. In the soil filtration device 190, when a aggregate filter medium such as soil is used as the filter medium, the drainage easily circulates, so that clogging is less likely to occur, and the maintenance cost can be reduced. It should be noted that the present invention can be implemented even if the waste water from the bath B is supplied to the septic tank 150.

  Next, the waste water treatment system 202 according to the second embodiment will be described with reference to FIG. Since the wastewater treatment system 201 according to this embodiment is different from the wastewater treatment system 200 according to FIG. 1 in the toilet apparatuses 101 and 102, this will be described.

  The toilet apparatus 101 includes a manure mixed toilet 13 and a solid-liquid separator 11 instead of the manure separator 10 of the toilet apparatus 100 of the first embodiment.

  Specifically, the urine mixed toilet bowl 13 is a toilet bowl that discharges excreted urine and urine in a mixed state, as shown in FIGS. 6 (a) and 6 (b), for example.

  Further, as the solid-liquid separator 11, for example, a precipitation separation type solid-liquid separator 11a as shown in FIG. The solid-liquid separator 11 has a precipitation tank 121 and a precipitation tank 122. The manure mixed waste water from the manure mixed toilet 13 is supplied to the middle of the sedimentation tank 121 via a line L8. Most of the soot settles in the sedimentation tank 121, and a part of the soot floats as scum. The urine-containing waste water is separated at the center of the sedimentation tank 121. The middle of the precipitation tank 121 and the middle of the precipitation tank 122 are communicated with each other through a communication pipe 124, and the urine-containing wastewater is transferred to the precipitation tank 122. After additional sedimentation separation is performed in the sedimentation tank 122, the urine-containing wastewater is discharged as a liquid from the middle of the precipitation tank 122 through the discharge pipe 124, and is supplied to the urine processing device 50 via the line L1.

  On the other hand, the soot settled in the settling tank 121 and the settling tank 122 is supplied to the septic tank 150 via the line L2.

  Further, as the solid-liquid separator 11, for example, a vertical cylindrical solid-liquid separator 11b as shown in FIG. 6B may be used. Specifically, the vertical tube 110 has a lower diameter wider than the upper diameter, and the vertical tube 112 is pointed into the widened portion of the vertical tube 110 from below. While flowing down the inner surface of the vertical tube 110 and collecting outside the vertical unit 112, the solid content is collected in the vertical tube 112. The urine-containing wastewater collected as a liquid is supplied to the urine treatment device 50 via the line L1, and the soot collected as a solid content is supplied to the septic tank via the line L2.

  Note that the solid-liquid separator 11 is not limited to these, and a solid-liquid separator 11 using a mesh or the like may be used.

  Even in such a solid-liquid separator, urine-containing wastewater is obtained as a liquid component, and soot-containing material is obtained as a solid component.

  On the other hand, returning to FIG. 5, the toilet apparatus 102 is provided with a urinal 12 instead of the urine separation toilet 10. The urinal toilet 12 is a toilet that excretes only urine and collects only urine, and supplies urine-containing wastewater to the urine processing device 50 through the line L1.

  Also in this embodiment, since the urine containing waste water discharged | emitted from the urinal 12 and the solid-liquid separator 11 is supplied to the urine processing apparatus 50, there exists an effect similar to 1st Embodiment.

  Next, the wastewater treatment system 202 according to the third embodiment will be described with reference to FIG. The main difference between the wastewater treatment system 202 according to the present embodiment and the wastewater treatment systems 200 and 201 according to FIGS. 1 and 5 is that a sewage pipe (denitrification unit) 160 is used instead of the septic tank 150. is there. The sewage pipe line 160 connects the sewage treatment plant 180 to the vicinity of the source of BOD source-containing wastewater such as manure and daily wastewater. The sewer pipe 160 is normally buried underground, and the inside is kept in an anaerobic atmosphere.

  It is preferable that the sewage pipeline 160 has a flow time of several hours to several days.

  That is, in this embodiment, mainly in cities, wastewater from wastewater containing manure and BOD sources is not provided with a septic tank, and wastewater from the source is conveyed to the sewage treatment plant 180 through the sewage pipeline 160. This system performs intensive denitrification and dephosphorization processes.

  In the present embodiment, the urine-containing wastewater is subjected to a treatment such as nitrification in the urine treatment device 50 before flowing into the sewage pipe 160, and then merges with the BOD source-containing wastewater such as kitchen wastewater in the sewage pipe 160. The inside of the sewage pipe 160 is anaerobic, and denitrification and decomposition of the BOD source are performed in the same manner as the septic tank 150 described above. Therefore, the treatment load in the sewage treatment plant 180 can be reduced, which is preferable. In the present embodiment, it is preferable that waste water from the bath B is also treated by flowing into the sewer pipe 160.

  Next, a wastewater treatment system 203 according to the fourth embodiment will be described with reference to FIGS. The main points of the wastewater treatment system 203 according to the present embodiment different from the wastewater treatment system 200 according to the first to third embodiments are as shown in FIGS. 11, the soot separated in 11 is supplied to the stirring tank 90 without entering the septic tank 150.

  A specific example of this embodiment will be described with reference to FIG. Since the urine separation toilet 10, the kitchen D, the bath B, the urine treatment device 50, and the septic tank 150 are the same as described above, the description thereof is omitted. The stirring tank 90 has a cylindrical tube portion 91, and a stirring blade 92 is installed in the tube portion 91. The stirring blade 92 can be rotated by a motor 94. Further, the cylindrical portion 91 is formed with an input port 96 through which a residue such as garbage collected in the residue receiver D2 of the sink D1 of the kitchen D can be charged. A porous material such as sawdust is previously placed in the cylinder portion 91. When the porous material and the cake residue are agitated and mixed in the stirring tank 90, the moisture in the residue is appropriately absorbed by the porous material, and the porous material serves as a carrier and is aerobic. Bacteria grow efficiently. Therefore, it is possible to ferment and decompose the coconut residue to obtain an organic substance having a low odor, volume reduction, and weight reduction. This organic matter can be discharged from the lid 93 and used as an organic fertilizer. It should be noted that the organic matter is sterilized by placing the straw in such a low moisture state for a predetermined period. Odor gas such as ammonia generated from soot is also adsorbed by sawdust.

  In this embodiment, since no soot is supplied to the septic tank or the sewage pipe, the denitrification load or the BOD removal load in the septic tank or the sewage pipe is further reduced, so that the size of the septic tank 150 can be further reduced, The treatment load at the treatment plant 180 can be reduced, and the treatment waste water can be further purified.

  In addition, this invention is not restricted to the said embodiment, A various deformation | transformation aspect is possible. For example, the urine processing device 50 shown in FIG. 4 can be used in the urine processing devices shown in FIGS.

  Further, the denitrification unit is not limited to the septic tank 150 or the sewage pipe 160, and any denitrification can be performed in an anaerobic state.

FIG. 1 is a diagram illustrating a flow of the wastewater treatment system according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing a specific example of the toilet apparatus 100 of FIG. FIG. 3 is a schematic cross-sectional view showing a specific example of the septic tank of FIG. FIG. 4 is a schematic cross-sectional view showing another example of the toilet apparatus 100 of FIG. FIG. 5 is a diagram illustrating a flow of the wastewater treatment system according to the second embodiment. 6A and 6B are schematic cross-sectional views showing specific examples of the urine mixed toilet 13 and the solid-liquid separator 11 shown in FIG. FIG. 7 is a diagram illustrating a flow of the wastewater treatment system according to the third embodiment. FIG. 8 is a diagram illustrating a specific example of the wastewater treatment system according to the fourth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Manure separation toilet (urine discharge part), 11 ... Manure mixed toilet, 12 ... Urine toilet (urine discharge part), 11 ... Solid-liquid separator (urine discharge part), 32 ... 1st nitrification tank (urine tank), 33 ... 2nd nitrification tank (urine tank), 47 ... Aeration means, 50 ... Urine treatment device, 51 ... Urine nitrification part, 52 ... Phosphorus removal part, 53 ... Pre-denitrification part, 55 ... Filter medium (porous filter medium), 90 ... Stirring device (stirring unit), toilet device ... 100, 130 ... denitrification tank, 140 ... nitrification tank, 150 ... septic tank (denitrification unit), 160 ... sewage pipe (denitrification unit), 190 ... filtration device (filtration) Part), L2 ... line (soot discharge pipe), L3 ... line (urine merging pipe), 200, 202, 203 ... waste water treatment system.

Claims (15)

A urine discharge part that discharges urine-containing wastewater in a state separated from sputum,
A urine nitrification unit that nitrifies urine-containing wastewater supplied from the urine discharge unit with microorganisms under aerobic conditions;
A denitrification unit that denitrifies urine-containing wastewater nitrified in the urine nitrification unit and wastewater containing a BOD source by microorganisms under anaerobic conditions;
Wastewater treatment system comprising.   The urine discharge unit includes a urinal toilet, a urine separation toilet that discharges excreted urine without mixing with urine, and a solid-liquid separator that discharges urine-containing wastewater by solid-liquid separation of the mixture of urine and urine. The wastewater treatment system according to claim 1, which is at least one of the above. The urine discharge part is the urine separation toilet or the solid-liquid separator,
The wastewater treatment system according to claim 2, wherein the waste discharged in a state separated from urine from the manure separation toilet or the solid-liquid separator is supplied to the denitrification unit. The urine discharge part is the urine separation toilet or the solid-liquid separator,
Furthermore, the waste water treatment system of Claim 2 provided with the stirring part which mixes and stirs the waste discharged | emitted in the state isolate | separated from urine from the said manure separation toilet or the said solid-liquid separator with a porous material.   The wastewater treatment system according to any one of claims 1 to 4, wherein the urine nitrification unit includes aeration means for performing aeration on the urine-containing wastewater.   The wastewater treatment system according to any one of claims 1 to 5, further comprising a pre-denitrification unit that denitrifies urine-containing wastewater supplied from the urine discharge unit, upstream of the denitrification unit.   The wastewater treatment system according to any one of claims 1 to 6, further comprising a phosphorus removal unit that removes phosphorus in the urine-containing wastewater supplied from the urine discharge unit before the denitrification unit.   The wastewater treatment system according to claim 7, wherein the phosphorus removal unit includes a porous filter medium or electrolysis means.   The wastewater treatment system according to any one of claims 1 to 8, wherein in the urine nitrification unit, the urine-containing wastewater comes into contact with a pH buffer material containing calcium carbonate.   The waste water treatment system according to claim 1, wherein the denitrification unit is a septic tank.   The waste water treatment system according to claim 10, wherein the septic tank has an anaerobic tank and an aerobic tank connected to the anaerobic tank.   The waste water treatment system according to any one of claims 1 to 9, wherein the denitrification unit is a sewer pipe.   The wastewater treatment system according to any one of claims 1 to 12, further comprising a filtration unit for bringing wastewater from the bath into contact with soil. A urine discharge part that discharges urine-containing wastewater in a state separated from sputum,
A urine nitrification unit that nitrifies the urine-containing wastewater supplied from the urine discharge unit with microorganisms;
Toilet device comprising.   The urine drainage unit is a urinal toilet, a urine separation toilet that discharges excreted urine as urine-containing wastewater without mixing with urine, and a solid urine-containing wastewater that is separated from the mixture of urine and urine by solid-liquid separation. The toilet device according to claim 14, wherein the toilet device is at least one of the liquid separators.

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