KR101207182B1 - Waste water treatment method - Google Patents

Abstract

PURPOSE: A wastewater treatment method is provided to optimize wastewater treatment by analyzing microorganism active sludge and diagnosing treatment conditions. CONSTITUTION: A wastewater treatment method includes the following steps: sludge containing microorganisms with reduced activity is drained from wastewater in a water collecting bath or an aerating bath(S1); the wastewater and chemicals are reacted to be coagulated in a coagulation bath(S2); coagulants and solid-liquid materials are separated such that settled sludge is transferred to a dehydrating facility and the solid-liquid materials are transferred to the aerating bath(S3); supernatant is digested and cultivated using aerobic microorganisms(S4); pollutants absorbed on active sludge, which is generated from the cultivating operation, are settled to be removed; and treated water is drained, and the sludge is transferred to the dehydrating facility(S5). [Reference numerals] (AA) Wastewater; (BB) Settled sludge; (CC) Excessive sludge; (DD) Draining treated water; (EE) Supernatant re-treatment; (FF) Exhausting sludge

Description

Wastewater Treatment Method {WASTE WATER TREATMENT METHOD}

The present invention relates to a wastewater treatment method, and more particularly, to improve excess sludge drawing and sludge solubilization and advanced oxidation treatment technology according to the bioadsorption characteristics of the anaerobic microorganisms, and to treat the microorganisms in the field and to treat the degradable organic wastewater treatment system. The present invention relates to the provision of an improved wastewater treatment method.

In general, the wastewater treatment apparatus or system 1 has a configuration as shown in FIG. 1 and looks at it as follows.

A water collecting tank 2 for temporarily storing raw waste water, a chemical coagulation reaction tank 3 for aggregating the waste water conveyed from the water collecting tank 2 with chemicals, and agglomerates generated in the coagulation reaction tank 3. The primary settling tank (4) for precipitating and removing the precipitate, and the aeration tank (5) for transporting only the supernatant water of the primary settling tank (4) to allow digestion and culture / growth by aerobic microorganisms, and the aeration tank ( 5) to precipitate and remove contaminants adsorbed by the activated sludge generated in step 5), and to generate the treated water, and from the primary and secondary sedimentation tanks 4 and 6. It is composed of a dehydration facility (7) for dewatering and reducing the sedimentation sludge, which is treated by landfilling or incineration, and circulating the rising filtrate generated during the treatment of sludge into a sump (2).

In general, in the wastewater treatment system, the treatment efficiency obtained by the pretreatment process can be greatly increased by adding the biodegradable organic wastewater which is weak by the pretreatment process by the chemical flocculation sedimentation reaction by the biosorption reaction by the random microorganism. Wastewater treatment system using activated sludge method using microorganism is operated to obtain maximum treatment efficiency with optimum economic efficiency.

In order to improve the treatment efficiency as described above, conventionally, the water collecting tank 2 constituting the wastewater treatment apparatus 1 is composed of an optional aeration unit 8, an optional precipitation unit 9, and an optional flow rate adjusting unit 10, The random abandonment part 8, the random settling part 9, and the random flow rate adjusting part 10 are partitioned by the partition wall 11.

At the bottom of the sump (2), an oxygen supply device having a perforated acid pipe for proper DO concentration control and smooth mixing of microorganisms and wastewater is provided, which is divided into an arbitrary abandoned part (8) and an arbitrary settling part (9). In addition, oxygen is supplied to each of the arbitrary flow rate adjusting units 10 so as to be able to be performed in an arbitrary reaction tank.

In the prior art as described above, due to the biosorption characteristics of the microorganisms as the long-term operation continues in the post-treatment biological treatment step of the wastewater treatment device, the activity of the microorganisms that is not a pure function due to the adsorption and accumulation of hardly degradable organic matter or organic nitrogen in the sludge excessively. Degradation of processing efficiency due to adverse functions such as degradation occurs frequently.

In order to solve this problem, it is solved by adding a decomposable organic substance or other species of sludge which is easily ingested by microorganisms, or adding a seedling or a seed agent to a sump or aeration tank.

However, because these degradable organic matter or other species of sludge cannot be added to the wastewater treatment device in addition to the additional planting or spawning agent, the manager is supplied from a culture facility or another culture facility installed separately from the wastewater treatment device whenever a problem occurs. Or the situation is to let the user input.

In this way, it is not possible to cope with the microbial activity deterioration quickly because it does not have to link the facility or device for easily and efficiently supplying the microorganisms to the wastewater treatment device, so the treatment efficiency of the wastewater is reduced, and the separate culture facility or device Because of the high cost of installation and operation, the overall cost burden of the wastewater treatment system is increased.

In addition, since the activity decreases due to excessive bioadsorption of microorganisms, the amount of waste sludge is excessively increased compared to the normal state. This happens.

In addition, since it takes a post-prescription form to restore the original state by supplying microorganisms separately after the activity decreases due to excessive bioadsorption of microorganisms, it takes a considerable time to reduce to the normal treatment state. There are a number of problems, including the inability to perform reliably, which leads to a decrease in overall efficiency.

Accordingly, in the present invention to solve the problems described above, the anaerobic anaerobic aeration process (S1) and agglomeration to discharge the sludge containing the microorganisms of reduced activity in the wastewater in the waste water tank or aeration tank into which the waste water is introduced, Chemical agglomeration reaction process (S2) for aggregating waste water and chemicals through a reaction tank, and separating agglomerates and solids into a dehydration facility where sedimentation and sedimentation are sent to the dehydration facility, and solids are separated into agglomeration and solid-liquid separation process (S3) and , Precipitated contaminants adsorbed by activated sludge produced by microbial culture propagation process (S4) and microbial culture propagation process (S4), which are supplied with only the supernatant separated from the aggregate and perform digestion and culture / growth by aerobic microorganisms. The sediment separation process (S5), and the flocculation and solid-liquid separation process (S3) It consists of a sludge treatment process (S6) which supplies and discharges the sludge generated in the final sediment separation process (S5), and supplies to the anaerobic aeration process (S1) to reprocess the supernatant generated in the sludge treatment process. Wastewater treatment method;

In the anaerobic aeration process (S1), one or more sedimentation baffles are installed by using a microorganism carrier of a lock mat (Lock Mat) type capable of attaching and growing microorganisms. Precipitating aggregates through and having a supernatant separation step (S11) to separate the supernatant, in the microbial culture growth process (S4) is further supplied to the collection tank or aeration tank receiving the microorganisms cultured through the microbial incubator By having it, it is possible to achieve the purpose of maximizing the efficiency of wastewater treatment.

The present invention provides a method of drawing a biosorbed excess sludge with reduced activity and using a microbial culture facility associated with a sedimentation baffle using a microbial carrier and an appropriate combination batch operation of solubilization and advanced oxidation treatment of the sludge. It has the effect of improving the treatment efficiency of the hardly decomposable organic matter or organic nitrogen-based wastewater treatment system.

In addition, microbial activated sludge is separated and analyzed on the basis of supernatant, turbidity, and sediment in the wastewater treatment process, and the treatment status can be accurately diagnosed and fed back to the site by properly combining the pure function as well as the inverse function. It has a variety of effects.

1 is a block diagram showing a wastewater treatment apparatus to which the prior art is applied.
Figure 2 is a block diagram showing a wastewater treatment apparatus to which the technique of the present invention is applied.
3 is a process block diagram illustrating a process in which wastewater is treated by the technique of the present invention.
Figure 4 is a process showing the separation of the sludge adsorbed microorganisms in the process of wastewater treatment by the technique of the present invention.
Figure 5 is a process diagram showing the culture and supply of microorganisms during the process of wastewater treatment by the technique of the present invention.

Hereinafter, with reference to the accompanying drawings look at a preferred example of the present invention for achieving the above object.

2 is a block diagram showing a wastewater treatment apparatus to which the technique of the present invention is applied, FIG. 3 is a process block diagram showing a process in which wastewater is treated by the technique of the present invention, and FIG. 4 is a wastewater by the technique of the present invention. Process diagram showing the separation of the sludge adsorbed microorganisms in the process of treatment, Figure 5 will be described together as a process diagram showing the culture and supply of microorganisms in the process of wastewater treatment by the technique of the present invention.

The conventional wastewater treatment apparatus 100 includes a collecting tank 101 for temporarily storing raw wastewater, a chemical coagulation reaction tank 102 for reacting and coagulating the wastewater transferred from the collecting tank 101 with chemicals, By transporting only the first settling tank 103 and the supernatant of the first settling tank 103 to precipitate and remove the aggregates generated in the flocculation reaction tank 102 to be digested and cultured / grown by aerobic microorganisms. Aeration tank 104, a secondary sedimentation tank 105 for sedimentation and removal of contaminants adsorbed by the activated sludge generated in the aeration tank 104, the primary sedimentation tank 103 and the secondary sedimentation tank ( The sedimentation sludge generated from 105) is dehydrated by dehydration using the dehydration unit 106, and then treated by landfilling or incineration.

Looking at the process of the waste water treatment through the waste water treatment apparatus 100, in the collection tank 101 or the aeration tank 104 in which the waste water is introduced for the first time, excessively degradable organic matter or organic nitrogen-inducing substances contained in the waste water are excessively adsorbed and accumulated. And through the anaerobic aeration process (S1) to give a simple settling function to discharge the sludge containing the microorganisms with reduced activity.

After passing through the anaerobic aeration process (S1), the flocculation reaction process (S2) for aggregating the waste water and the chemicals through the flocculation reaction vessel (102) and the coagulation and solids are separated through the primary precipitation tank (103). The sedimentation sludge is sent to the dehydration facility 106, and the solids are supplied to the aeration tank 104, and only the supernatant separated through the aggregates and solids separation process (S3) is supplied to the aerobic microorganisms. The treated water is discharged and precipitated by precipitating and removing the contaminants adsorbed by the activated sludge produced in the microbial culture propagation process (S4) and performing the digestion and culture / proliferation by The sludge generated in the final sediment separation process (S5) and the flocculation and solid-liquid separation process (S3) and the final sediment separation process (S5) sent to the dehydration unit 106 is discharged, and is generated during the sludge treatment process. Etc. comprises a sludge treatment process (S6) of supplying a flexible anaerobic giving process (S1) to reprocess the filtrate.

In the present invention, in the anaerobic aeration process (S1) by temporarily installing one or more sedimentation baffles 107 using a lock mat (Lock Mat) type microorganism carriers capable of attaching and growing microorganisms 108 temporarily And sedimentation unit 109 by receiving the sludge is supplied to the sediment through the sedimentation baffle to have a supernatant separation step (S11) for separating the supernatant.

In the microbial culture propagation process (S4) receives the microorganisms cultured or denatured through the microbial incubator 110 to the sump tank 101 or the aeration tank 104 to supply to the sump tank 101 or the aeration tank 104 to improve the treatment efficiency. Have more steps to maximize.

In the microbial culture propagation process (S4), the biodegradable organic material or organic nitrogen is excessively absorbed and accumulated from the collection tank 101 or the aeration tank 104 to receive sludge with reduced activity, and is used for microbial culture or denaturation culture. The adjuvant and the propagation aid are subjected to a stirring step (S41) of evenly mixing the sludge and the propagation aid by supplying heat to maintain the optimum temperature for the saccharification reaction.

The mixture of the sludge and the growth aid passed through the stirring step (S41) is passed through the settling baffle to allow the mixture of the sludge and the growth aid to maintain a proper (0.5 ppm) dissolved oxygen (DO) while precipitating solids to the bottom of the microorganism. (Supernatant) to pass through the supernatant separation step (S42) to separate.

The supernatant passed through the supernatant separation cycle (S42) is in a state in which microorganisms are cultured, and the cultured microorganisms include a microbial supply step (S43) for supplying the wastewater treatment apparatus 100 while temporarily storing the microorganisms.

The microorganisms in the microorganism supplying step (S43) are supplied to the wastewater treatment apparatus 100, as well as the microorganisms by denaturing and culturing the microorganisms, and supplying them to a denaturing incubator for increasing the proliferation rate and enzyme generation capacity. S41) or the modified culture step (S44) to be supplied to the wastewater treatment apparatus 100 may be further included.

Looking at the process of wastewater treatment through the wastewater treatment method applied the technology of the present invention as described above are as follows.

Wastewater flowing into the sump tank 101 or the aeration tank 104 is moved from the aeration section temporarily partitioned by the sedimentation baffle to the sedimentation section. In this process, aggregates such as sludge move to the upper layer of the aeration section by the aeration section. After moving to the precipitation part through the opening formed in the baffle, it is settled at the bottom of the precipitation part.

As such, in the process of horizontally moving to the sedimentation part by aeration, the sedimentation baffle prevents the horizontal vortex phenomenon to induce sedimentation, and the separated and precipitated aggregate is sent to the dehydration unit 106. Only the supernatant water is transferred to the coagulation reaction tank 102 or the secondary sedimentation tank 105 to undergo normal processing.

The aggregate generated in the flocculation reaction tank 102 is removed by sedimentation in the primary settling tank 103, and the supernatant after the flocculation precipitates is transferred to the aeration tank 104 so that digestion and culture / proliferation by aerobic microorganisms are performed. .

The contaminants adsorbed by the activated sludge produced in the aeration tank 104 are moved to the secondary sedimentation tank 105 to be precipitated and removed, and the sedimentation sludge generated from the first and second sedimentation tanks 103 and 105 is dewatering facility 106. ), And dehydration to reduce the weight and then repeat the process by landfill or incineration.

In such wastewater treatment, the activity of useful microorganisms is increased due to the adsorption and accumulation of activated biodegradable organic matter or organic nitrogen-causing substances into activated sludge without biodegradation due to the biosorption characteristics of microorganisms. If the diagnostic result is significantly reduced or the treatment result is reduced (decreases) or it is determined that there is such a concern, the microbial culture apparatus 110, which is associated with the wastewater treatment apparatus 100, is cultured through the microbial culture propagation process (S4). By supplying microorganisms to the sump tank 101 or the aeration tank 104, it is possible to smoothly and efficiently wastewater treatment by delaying or reducing the activity degradation of useful microorganisms due to excessive bioadsorption.

Looking at the microbial culture propagation process (S4),

In the wastewater treatment apparatus 100, the activated sludge having the reduced microbial activity (or the ability to generate characteristic enzymes) is supplied from the collecting tank 101 or the aeration tank 104, and is supplied with the growth aid and heat necessary for culturing the microorganism together with the sludge and stirred. The temperature is maintained so that the growth aid maintains a temperature suitable for the saccharification reaction, and then the sludge and the growth aid are mixed evenly.

At this time, in order to recover the activity of the sludge poisoned by the dysfunctional biosorption phenomenon, it is not biodegradable but is adsorbed and accumulated on the sludge (adsorption action is promoted when the acid range is below pH 6). Keep nitrogen in the pH range of about 9 to allow the reaction to proceed in the solubilization direction.

At this time, the supply of the required alkali is to be adjusted automatically through the acidity regulator, and when the operation as described above, in the stirring step (S41), the recovery of the sludge is lowered activity is started.

When the sludge and the growth aid are evenly mixed in the stirring step (S41), the concentration of oxygen in the water (DO) is maintained at about 0.5 ppm so as to perform full-scale proliferation culture and purification of the microorganisms that have begun to recover activity.

Prokaryotic microorganisms, aerobic basic microorganisms (Procaryotes), are dominant species in the DO range above, and eukaryotic microorganisms (Eucaryotes type, etc.) are recessive conditions and proliferation culture is inhibited. Due to this, it is to promote the proliferation culture of prokaryotes by interfering with the food chain formation.

The unresolved waste (garbage, etc.) included in the growth aid in the stirring step (S41) may be a factor of increasing the excess sludge when it is transferred to the wastewater treatment plant as it is, so it is necessary to separate the supernatant with the supernatant. .

Therefore, in order to separate the solid residue, it is necessary to set up the conditions that can be separated by settling by standing still, and to impart this function, it is necessary to block the horizontal vortex due to air aeration.

In order to impart the above function, in the present invention, a vortex phenomenon may be reduced or blocked by installing a precipitation baffle made by using a lock mat type media.

The number of settling baffles is more than one, and the vortices are reduced by arranging the openings, and the lower openings contacting the bottom are disposed between the settling baffles and the settling baffles by the air lifting phenomenon by arranging them properly with the air supply. This expected undecomposed residue will not remain.

Solids that have been moved without vortex through the settling baffle will sink to the bottom and the remaining ascending liquid (microorganisms) will be separable to the top. (Supernatant separation step S42)

The supernatant separated to the upper is stored and moved to the microbial storage tank, and since the stored microorganisms are grown and cultured, the supernatant may be supplied directly to the collection tank 101 or the aeration tank 104 constituting the wastewater treatment apparatus 100. Step S43)

The microorganisms stored in the microorganism supplying step (S43) are modified and cultured to be supplied to a denaturing incubator for increasing the proliferation cleavage rate and the enzyme generating ability, and then supplying the microorganisms to the microbial incubator 110 or the wastewater treatment apparatus 100 after the denaturing culture. (Denatured culture step S44)

The denaturation culture step (S44) is a form of adding a specific chemical to the microorganisms or irradiating X-rays, irradiating gamma rays or ultraviolet rays (UV) by receiving the microorganisms from the microorganism supply step (S43) and Exposure to denaturation inducing means to induce denaturation of the same microorganism.

Among the major mechanisms of the reactions involved in biological wastewater treatment, the most important mechanism is actually a biochemical reaction, and ultimately hydrolysis and metabolism occurs by the action of specific enzymes as biocatalysts.

In any case, the microorganisms adsorb organic matters for their proliferation and metabolism, or they adsorb with organic matters, and microorganisms have the property of producing enzymes necessary for themselves.

In particular, if special conditions are created by adding specific chemicals to the basic microbial group, X-ray irradiation, ultraviolet (UV) irradiation, gamma-ray irradiation, etc., microorganisms themselves are mutated (denatured) to cope with such conditions. By increasing the rate of proliferation and splitting, or by such a phenomenon, the ability to generate enzymes is rapidly increased, so that the modified microorganisms subjected to the denaturation culture step (S44) can be supplied to maximize the treatment efficiency of the wastewater.

The present invention as described above has the advantage of maximizing the efficiency of wastewater treatment by receiving microorganisms from the microbial culture apparatus associated with the wastewater storage device when the activity of the microorganisms of the wastewater treatment apparatus is reduced.

100; Wastewater Treatment System
110; Microbial incubator
S1; Tough anaerobic aeration process
S2; Chemical Town Reaction Process
S3; Solid-liquid Separation Process
S4; Microbial Culture Propagation Process
S5; Final sediment separation process
S6; Sludge Treatment Process
S11; Rising water separation stage
S41; Stirring Step
S42; Supernatant separation stage
S43; Microbial Supply Stage
S44; Metamorphic Culture Stage

Claims (3)

An anaerobic aeration process (S1) for discharging sludge containing microorganisms having reduced activity in the wastewater of the sump or aeration tank into which the wastewater is introduced;
A chemical coagulation reaction process (S2) for coagulating by reacting the wastewater and the chemicals through the coagulation reaction tank;
Separating the aggregates and solids and sending the sedimentation sludge to a dehydration facility, and separating the aggregates and solids into aeration tank (S3);
Microbial culture propagation process (S4) of receiving only supernatant separated from the aggregate and performing digestion and culture / proliferation by aerobic microorganisms;
A final sediment separation process (S5) of precipitating and removing contaminants adsorbed by the activated sludge produced by the microbial culture propagation process (S4) and then discharging the treated water to a dewatering facility.
Treated and discharged the sludge generated in the flocculant and solid-liquid separation process (S3) and the final sediment separation process (S5), and supplied to the anaerobic aeration process (S1) to reprocess the supernatant generated in the sludge treatment process. In the waste water treatment method consisting of a sludge treatment process (S6);
In the anaerobic aeration process (S1), one or more sedimentation baffles are installed by using a microorganism carrier of a lock mat (Lock Mat) type capable of attaching and growing microorganisms. Precipitating aggregates through and having a supernatant separation step (S11) for separating the supernatant;
The microbial culture propagation process (S4) is a wastewater treatment method characterized in that it further has a step to maximize the treatment efficiency by receiving the microorganisms cultured through the microbial incubator to supply to the sump tank or aeration tank. The method of claim 1, further comprising:
In the microbial culture propagation process (S4), the sludge with reduced activity is supplied from the sump tank or the aeration tank, and the growth aid and the growth aid used in the microbial culture or the modified culture are supplied with heat to maintain the optimum temperature for the saccharification reaction. And stirring the step of evenly mixing the sludge and the growth aid (S41);
A supernatant water separation step (S42) of allowing the mixture of the sludge and the growth aid to pass through the precipitation baffle to precipitate the solids to the bottom to separate the microorganisms (supernatant) while maintaining the proper dissolved oxygen of the mixture of the sludge and the growth aid;
Wastewater treatment method comprising the step of supplying microorganisms (S43) for temporarily supplying the cultured microorganisms to the wastewater treatment apparatus. The method according to claim 1 or 2,
The microorganism cultured in the microbial backstroke proliferation process (S4) is supplied to a denaturation incubator to increase the growth cleavage rate and enzyme generation capacity, and then modified culture step (S44) to supply to the agitating step (S41) or waste water treatment device after denaturation culture. Waste water treatment method comprising a gutter more.

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