KR20000045943A - Treating method of wastewater using activated microorganism - Google Patents

Abstract

PURPOSE: A treating method of wastewater using activated microorganism is provided, which is characterized in that a settling pond and an aeration tank are installed to activate microorganism group. CONSTITUTION: A method is composed of a settling pond(1,5), controlling tanks(2,3,4) of wastewater level, an aeration tank(3), and controlling tank(8) of microorganism. Microorganism group is cultivated and activated using mineral component, so organic matters are adsorbed and metabolized. Microorganisms are fixed on the media in the contacting aeration tank(4), and activated in the controlling tank(7). Activated microorganisms are cultivated again with returned sludge in the controlling tank(8), and flocculated by coagulation and polymerization. Floc is filtered in the filtration tank(6), and concentrated(9).

Description

Large scale sewage treatment method using active microorganism

The present invention relates to a method for treating organic sewage and sewage. More specifically, the present invention relates to a treatment method for purifying organic sewage and sewage using a kind of activated sludge treatment method for regulating and activating soil microbial flora.

Nature has a food chain structure based on microorganisms, and natural ecosystems including humans have been able to continue their activities, depending on the generation and decomposition of organic matter through the decomposition and synthesis of various microbial groups. Due to the highly developed industrialized society and urbanization due to human activities, the construction of many dams is necessary to secure water due to the concentration of the population, but due to the construction of such dams, the self-cleaning ability of appeals is gradually being lost. As a result, a large amount of polluted minerals and organics are introduced into the stream, which leads to a very serious condition of the river and the natural environment.

As the seriousness of environmental pollution emerges, the contaminated wastewater does not rely on the self-cleaning ability of nature, and by applying the decomposition of organic substances in the natural state, a large amount of natural microorganisms concentrated in artificial structures are secured to decompose organic substances and Biological treatments are being developed to treat contaminated wastewater quickly in limited space by creating optimum environmental conditions for synthesis. In addition, since wastewater containing various chemicals discharged with human activities is difficult to be decomposed by microorganisms, a chemical treatment method using chemicals has been developed.

On the other hand, activated sludge method is generally used as the biological treatment method described above. The activated sludge method consists of an aeration tank and a precipitation tank in which the first settling tank and microorganisms grow, and recently, a method of increasing the number of more active microorganisms and adding microorganisms capable of decomposing hardly decomposable substances in the aeration tank based on such a reaction tank. Research is being conducted to improve the treatment efficiency by improving the sedimentation and sedimentation basin for the effective separation of the decomposed treated water and microorganisms.

However, until now, such biological treatment methods have a poor ability to cope with load fluctuations of influent raw water, and if filamentous microorganisms are overgrown in the aeration tank, the sedimentation property becomes poor and it is easy to cause instability of treated water quality. In addition, problems such as a weakening of the coping ability with chemicals such as bleach, which are likely to be contained in the influent raw water, and the need of a skilled operating technician are exposed.

In order to solve the above problems, the present inventors studied a method of most effectively purifying organic sewage and sewage using a kind of activated sludge treatment method that adjusts and activates the soil microbial flora that forms the basis of microorganisms in a natural ecosystem. . As a result, the present inventors have used microorganisms to oxidatively decompose organic materials by using the settling basin for primary sedimentation (1), the flow rate adjusting tank (2) which makes it possible to equalize the flow rate and concentration of the inflow source water, and the oxygen continuously supplied. Contact aeration tank (4), in which active microorganism groups in the simple aeration tank (3), the active microorganism regulator (7) and the active microorganism regulator (8) are attached to the contact media in large quantities, and oxidative decomposition of active organic substances proceeds (4), treated water and microorganisms Final sedimentation tank (5) for solid-liquid separation by gravity, active microbial regulator (7) designed to reactivate immobilized soil microorganisms by oxygen supply, and active microbial microorganism (1) ), A system consisting of filtration digestion tanks (6) to remove pin flocs, and peripheral treatment devices such as thickener tanks (9), sludge storage tanks (10) and dehydrators (11). We developed a method for processing waste water on a large scale.

1 is a flow chart of a large scale sewage treatment method using an active microorganism according to the present invention.

Figure 2 is a detailed view of the active microorganism regulator in the present invention.

<Explanation of symbols for main parts of drawing>

1: tide tank

2: flow adjustment tank

3: simple aeration tank

4: contact aeration tank

5: final sedimentation tank

6: Filtration tank

7: active microbial regulator

8: active microbial regulator

9: thickener

10: sludge storage tank

11: dehydrator

12: microorganism control tank inlet pipe

23: fluid flow tube

24: coordinator diffuser

Accordingly, the present invention provides a settling basin (1) for the first settling and removal of the sand or easily sedimentable contaminants contained in the influent, flow rate adjusting tank (2) to equalize the flow rate and concentration of the influent, and continuously supplied oxygen Simple aeration tank (3) in which microorganisms oxidatively decompose organic materials by using, contact aeration tank (4), in which active microorganism groups in active microorganism control tank (8) are attached to a large amount of contact media to actively oxidatively decompose organic materials. A final settling tank for solid-liquid separation of treated water and microorganisms by gravity, an active microorganism regulator designed to activate immobilized soil microorganisms back into microorganisms by oxygen supply, and a large number of activated microorganisms with return sludge Such as active microbial conditioning tank (8), filtered digestion tank (6) for removing pin floc, and thickening tank (9), sludge storage tank (10) and dehydrator (11). Using the system and the system consisting of a service processing unit to a method of large-scale processing the waste water.

That is, according to the method of the present invention as described above, the microorganism group prepared by culturing the random soil microbial bacterial flora contained in the sewage (wastewater), and mixed with various soil preparations and the like and the minerals eluted from the microorganism regulator When activated microorganisms are cultured and activated in the aeration tank, the metabolites, randomly decomposable organic matters and suspended organics of random soil microbial fungi are absorbed and metabolized by activated microorganisms. In the case of dissolved organic matter, macromolecules and flocs are rapidly formed by complex functions such as adsorption, coagulation, and polymerization by polymers produced by activated microorganisms. Therefore, the sedimentation property of the sludge is greatly improved, and solid-liquid separation between the treated water and the microorganism can be performed smoothly, thereby ensuring a stable and good treated water quality.

On the other hand, in order to effectively remove pin-floc formed by endogenuos respiration in the aeration tank and suspended matters which do not settle out by these pin flocs, a filtration decomposition tank is installed and a floating media is filled. Thus, by attaching the microorganisms to the surface of the filled media to form a condition that can be decomposed by the microorganisms and once again removed, it is possible to secure a stable, economical and efficient treatment water quality.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Wastewater treatment method according to the invention can be carried out according to the flow chart of FIG. As shown in Fig. 1, the large-scale sewage treatment method using the active microorganism of the present invention starts from the settling basin (1) that primarily precipitates and removes sand or easily sedimentable contaminants contained in the influent source water. In addition, the reaction tank used in the method of the present invention minimizes the flow rate and concentration change of the incoming raw water to improve the treatment efficiency of the subsequent treatment facility, and equalizes the flow rate and concentration in order to minimize the influence of the subsequent treatment facility due to the impact load. Flow control tank (2), which allows the microorganisms to oxidatively decompose organic matter using oxygen continuously supplied (3), active microbial regulator (7) and activated microbial group in the control tank (8) Contact aeration tank (4) where oxidative decomposition of active organic materials is progressed by attaching a large amount to the media, final sedimentation tank (5) for solid-liquid separation of treated water and microorganisms by gravity, and various microorganisms present in soil are immobilized for long-term storage Activated microorganism regulators (7), activated microorganism regulators (7), designed to be activated again by the oxygen supply. Active microbial conditioning tank (8) for mass cultivation activated with the returned sludge, filtration digestion tank (6) for removing pin floc, and peripheral treatment equipment to reduce the amount of sludge and increase the concentration to increase the subsequent treatment efficiency and facility cost. And a condenser (9) for reducing the operating cost, a sludge storage tank (10) for storing the concentrated sludge, and a dehydrator (11) for removing the water of the condensed sludge to reduce the amount of sludge to be disposed of and for convenient disposal. It is.

First, the sewage treatment method according to the present invention, by removing the non-corrosive inorganic material and particles having a large particle size of 0.2mm or more in the sewage in the sedimentation (1) to prevent the wear of the pump equipment and to prevent the damage or closure of the treatment facilities, subsequent treatment The facility can be operated smoothly. The settling paper 1 can be rectangular or square, and the number is preferably two or more. In addition, the earth and sand 22 deposited on the lower portion of the settlement 1 can be removed by manpower in a small case, but in the case of a large scale it can be treated by installing a mechanical discharge device.

The to-be-processed object via the settling basin 1 flows into the flow regulating tank 2. The flow regulating tank 2 is installed for the purpose of absorbing and equalizing the fluctuations in the flow rate of the influent sewage and the water quality in order to increase the treatment efficiency of the subsequent treatment facility and improve the treatment water quality. In the case of small-scale treatment facilities, the length of the inlet pipe is short, so the fluctuations in the inflow water quality and inflow flow are large, so it is desirable to install it. Can be installed. In addition, considering the economic performance and ease of maintenance, if the scale is not large, it can be operated by performing the role of the primary sedimentation tank in parallel. The sludge deposited under the flow adjusting tank 2 is transferred to the concentration tank 9 through the sludge discharge line 19.

The object to be processed via the flow regulating tank 2 is transferred to the aeration tanks 3 and 4. In the aeration tanks (3, 4), various microorganisms oxidize organic substances using oxygen supplied continuously and nutrients contained in wastewater, and organic substances are accumulated through the proliferation of microorganisms and flocculation of suspended matter and colloidal substances. Removed. In the present invention, the aeration tank is installed in two stages, in order to increase the concentration of microorganisms in the single stage aeration tank (3), the sludge in the final settling tank (5) and the activated microorganisms in the active microorganism control tank (8) are continued. As it is supplied, it is excellent in floc formation of sludge, excellent in sedimentation, and excellent in processing efficiency.

The two-stage contact aeration tank (4) is equipped with a plate-shaped filter media to improve the ability to cope with fluctuations in the flow rate and water quality that occur a lot in small-scale treatment facilities, and to prevent sedimentation defects caused by lengthening the aeration time to reduce sludge generation. have. In addition, by lengthening the residence time (SRT) of the sludge induces active nitrification by nitrifying microorganisms to promote the removal of nutrients, it is installed to increase the ability to respond to environmental factors such as temperature and pH of the microorganisms.

The conditions of the preferred media to be installed in the contact aeration tank (4) must first ensure sufficient voids so as not to disturb the flow of the fluid, second, ensure biological, physical, and chemical stability in the reaction tank, and third, ensure sufficient microorganisms. For example, the specific surface area of the media must be large, and fourth, economics must be available. In addition, the shape of the contact medium is good plate-like structure that is easy to attach the microorganisms and does not affect the flow of the aeration chamber, it is preferable to arrange at right angles to the diffuser to prevent turbulence. The material is preferably a plate-shaped media having a thickness of 2-3 cm, made of polyurethane, from the viewpoint of microbial adhesion ability, permanence and economy.

The active microbial regulator 7 is composed of a lithotripsy, microbial influenza pumice and a mineral regulator and a coordination regulator installed at the bottom thereof. Various minerals essential for the growth of microorganisms are eluted by the mixing action of the coordinator's oxygen supply, and the eluted microorganisms and the native microorganisms of the inoculated pumice can help the activity of the microorganisms eluted while passing through the immobilized microbial layer. give.

In addition, as shown in Fig. 2, the regulator 7 may be provided with a fluid flow tube 23 in the center to prevent sludge settling at the bottom and to smooth the flow of the upper and lower portions.

Various microorganisms eluted from the immobilized microbiota and microorganisms in the return sludge 16 are introduced into the active microorganism conditioning tank 8. In the active microorganism control tank 8, the introduced active microbial group and the return sludge are mass cultured, propagated and activated using the organic matter of the to-be-processed and transported to the simple aeration chamber 3, where a large amount through active oxidation and proliferation is performed. The organic substance of will be removed. In addition, it is possible to ensure a stable treatment efficiency by fully exhibiting a buffering role for the microbial inhibitors (chlorine-based bleach and detergents, etc.) contained in the raw water.

The amount of influent flowing into the active microorganism regulator (7) is 50% of influent (12) and sedimented sludge (16), respectively, and the amount of influent varies depending on the size of the treatment plant. Sludge) is suitable for 1/20-1/50 of influent water on small scale and 1/50-1/100 on large scale. The residence time of the active microorganism regulator (7) was found to be consistent with the results of the microbial activation experiment in the laboratory and the literature.

The final settling tank 5 primarily aims at separating the sludge and the treated water generated by the biological treatment. The shape of the final settling tank 5 depends on the relationship between the site area and other treatment facilities and the cost of construction, but usually a circular settling basin is used. The precipitated sludge is conveyed to the simple aeration tank 3 through the return line 17 and part of it is returned to the active microorganism control tank 8, and the surplus sludge is sent to the sludge line 19 together with the settling sludge of the flow adjustment tank 2. Is sent to the thickener (9).

In general, the amount of return of the treated water through the conveying line 17 is determined in a range in which the microbial concentration (MLSS) of the simple aeration tank is maintained at a constant level, and those skilled in the art will know the site conditions and conditions of the aeration tank, the inflow water quality and These conveyances can be easily determined according to the quantity.

On the other hand, if the residence time in the aeration tanks (3, 4) is long, the sludge generation amount is reduced by the endogenous breathing of the microorganisms, but the pin flocs that the microorganisms do not form flocs are generated. Since the formed pin floc is not precipitated in the settling tank is discharged as it is to act as a deterioration factor of the treated water quality, by installing a filtration decomposition tank (6) to prevent this. When the filter medium is filled with suspended media, the outflowing microorganisms adhere to the surface of the media, and the remaining dissolved oxygen by oxygen supplied from the aeration tanks (3, 4) and the microorganisms attached to the media are used for biological treatment of residual organic substances. Sedimentation of the pin floc ensures stable treatment water quality. The media used is not particularly limited as long as the media have the conditions that the general media have. The filter filling rate is 100%, and in order to prevent the media from tipping to the water flow, a method of connecting the media between the media is preferable.

Determination of the residence time in the filtration tank (6) is determined through laboratory-scale experiments and hydraulic experiments, preferably 2-3 hours in 24 hours continuous operation, and above all, continuous injection in the field It is important to ensure continuity of flow by In addition, the sludge precipitated in the lower part of the filtration cracking tank (6) is designed to be transported to the flow rate adjusting tank (2) through the sludge discharge facility 20 to maintain a constant treatment efficiency.

The sludge thickening tank 9 is operated to reduce the volume of sludge, thereby reducing the cost of the post-treatment plant and the operation. In general, Gravity Thickening is the most used. However, depending on the purpose of use, Dissolved Air Flotation Thickening or Centrifugal Thickening may be applied. In addition, since the odor is very severely induced in the concentration tank 9, the activated microorganisms of the active microorganism adjusting tank 8 may be introduced into the concentration tank 9 through the inflow line 15 to achieve biological odor removal. The concentrated sludge is transferred to the sludge storage tank 10, and the concentrated supernatant is returned to the flow adjusting tank through the conveying line 21 for reprocessing.

The sludge storage tank 10 temporarily stores concentrated sludge and its capacity is determined according to the operation method of the dehydrator 11, which is a subsequent facility. Sludge dewatering 10 is used to remove the water in the sludge to reduce the amount of sludge to be disposed of. In general, mechanical dehydration methods are widely used, and mechanical dehydration methods include vacuum dehydration, filer press, belt press, centrifugal dehydrator, and the like. The dehydrated cake is disposed of by conventional methods such as landfilling or incineration.

<Example>

Artificial sewage was prepared on a laboratory scale and treated as a sample according to the sewage treatment method using the above-mentioned active microorganisms, and the results are shown in Table 1. Inflow water was collected directly from the J sewage treatment plant in Seoul and mixed with manure, similar to the actual sewage generation concentration.

Metric Influent (mg / L) Effluent (mg / L) Removal efficiency (%) BOD 233 4.9 97.9 CODcr 600 48 92.0 SS 223 3.0 98.7 T-N 74 8.0 89.1 T-P 9.4 6.4 31.9

As can be seen from the above results, in the conventional conventional activated sludge method, BOD in effluent is 30 mg / L and SS is 30 mg, whereas in the present invention, BOD is 4.9 mg / L and SS is 3.0 mg / L. Showed very good results.

According to the present invention, there is provided a sewage and sewage treatment method which is easier to cope with the load fluctuations of the influent compared to the conventional activated sludge method, has a high treatment efficiency with respect to chemicals contained in the influent raw water, and has good sedimentation.

Claims (4)

Settling basins for the first settling and removal of sand or easily sedimentary contaminants contained in the influent (1), flow control tanks (2) to equalize the flow rate and concentration of the influent, and microorganisms using continuously supplied oxygen Simple aeration tank (3) for oxidative decomposition of organic materials, active microorganism group in active microorganism control tank (8) is attached to contact media in large quantities, and contact aeration tank (4) where oxidative decomposition of active organic materials proceeds, treated water and microorganisms Final settling tank for solid-liquid separation by gravity (5), active microbial regulator designed to activate immobilized soil microbiota back to microorganisms by oxygen supply (7), active microbial regulator with large amount of activated microorganisms with return sludge (8) ), Filtration digestion tank (6) to remove pin floc, and peripheral treatment devices such as thickener (9), sludge storage tank (10) and dehydrator (11). Large-scale waste water treatment method using the active microbe using the system. The microorganism regulator 7 according to claim 1, wherein the active microorganism regulator 7 is composed of lithotripsy, inoculated pumice and mineral layers, and a coordinating diaphragm installed at the bottom thereof. The various microorganisms eluted from the immobilized microbial layer and the microorganisms in the return sludge (16) pass through the active microorganism control tank (8), which is multiplied and activated using the organic materials of the inflowing treatment sludge (3). Large scale sewage treatment method using an active microorganism, characterized in that the transfer to. An active device according to claim 1, wherein a fluid flow pipe (23) is provided at the center of the active microorganism regulator (7) to prevent sludge settling at the bottom of the regulator (7), and an active fluid designed to smoothly flow the upper and lower portions. Large scale sewage treatment using microorganisms. The flow rate adjusting tank (2) and the sludge thickening tank (3) according to claim 1, wherein the microorganisms activated in the active microorganism adjusting tank (8) are introduced into the flow adjusting tank (2) and the concentrating tank (9) through a predetermined amount through the inflow lines (14, 15). Large scale sewage treatment method using active microorganism designed to remove the biological odor of 9).