KR20160017818A - System for advanced wastewater treatment using optimal micro-organism of pollutants and the method thereof - Google Patents

Abstract

More particularly, the present invention relates to a BAF process comprising BAF anoxic tank and BAF aerobic tank; And an A2O process comprising an anaerobic tank, an anoxic tank, an aerobic tank, and a settling tank. The treated water of the BAF process is supplied to the anaerobic tank of the A2O process for the purpose of an increase in nitrogen removal rate, The present invention relates to a sewage / wastewater advanced treatment system using an optimal microorganism and a method thereof, in which raw water for waste water is dividedly introduced into the BAF process and the A2O process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for advanced wastewater treatment using an optimal microorganism for each pollutant,

The present invention relates to a system and method for treating a wastewater by using an optimal microorganism for each pollutant, and more particularly to a system and method for treating a wastewater by using a fixed carrier having a biofilm formed by microorganisms, Biological Aerated Filter (BAF) process that removes nitrogen through nitrification and denitrification and alternately exposes microorganisms to anaerobic and aerobic conditions to induce the consumption of phosphorus in excess of that required for growth, Which is capable of effectively removing nitrogen and phosphorus in the waste water and wastewater, and a method thereof.

Recently, rapid industrialization and concentration of population in large cities have worsened environmental pollution and deteriorated the water quality environment. Nutrients such as nitrogen and phosphorus have been introduced into water resources such as rivers, streams and lakes to cause eutrophication.

At present, in order to solve the above-mentioned problems, technologies for removing nitrogen and phosphorus which are the cause of eutrophication in the wastewater treatment process are being developed and studied. Among them, microorganisms are excellent in nitrogen and phosphorus removal , And the ability to reduce water purification by reducing the use of water purification chemicals.

Currently, biological nitrogen removal methods using microorganisms include a method using activated sludge and a method using biofilm filter paper.

In the activated sludge process, nitrogen in a reduced form is oxidized into nitrate nitrogen by the action of nitrifying bacteria, and is then discharged to the atmosphere using nitrogen gas using denitrifying bacteria to remove nitrogen from the water column. More specifically, in the course of oxidizing ammonia nitrogen, the following nitrification reaction is performed by AOB (Ammonia Oxidation Bacteria) or NOB (Nitrite Oxidation Bacteria) which produce bioenergy.

NH ₄ ⁺ + 2O ₂ → NO ₃ ^- + 2H ⁺ + H ₂ O

In the above nitrification, 4.57 mg / L of oxygen is required for the oxidation of 1 mg / L of nitrogen, and the alkalinity of 7.14 mg / L (as CaCO ₃ ) is consumed. Oxidation of ammonia nitrogen to nitrite nitrogen was carried out using Nitrosomonas sp., Nitrococcus sp. And Nitrosospira sp. , And the nitrite nitrogen is oxidized to nitrate nitrogen by Nitrobacter sp., Nitrospira sp. And Nitrocystis sp. And the like. The nitrifying microorganism has a proliferation coefficient of 0.05-0.10 gVSS / g N, which is lower than that of 0.45-0.60 gVSS / g C, by a factor of 10, which is relatively long to induce nitrification reaction. The SRT (sludge stagnation Time).

As described above, the nitrified nitrogen is converted into the nitrogen gas form through the denitrification by the denitrifying bacteria and is discharged to the atmosphere. Nitric acid nitrogen is an electron donor that is lost to electrons and reduced to N _2. Microorganisms that use nitrate nitrogen as an electron acceptor and organic matter as a carbon source include Pseudomonas sp., Microscopics sp. And Acromobacter sp. And so on. As the denitrification reaction requires an organic carbon source, raw sewage, food wastewater and organic wastewater can be used. When methanol is used as an organic carbon source for denitrification, nitrogen is removed by the following route.

NO ₃ ^- + 1.08 CH ₃ OH + 0.24H ₂ CO _{3 -} > 0.06C ₅ H ₇ O ₂ N + 0.47N ₂ + 1.68H ₂ O + HCO ₃ ^-

In the denitrification reaction described above, 2.47 g of methanol is required for denitrifying 1 g of nitrate nitrogen, and generally 4 to 5 g of BOD is required when sewage is used as an organic carbon source.

Also, there is a method of removing nitrogen through a process using the biofilm, wherein the biofilm is composed of a carrier to which the microorganism can adhere and a microorganism to grow on the carrier. In general, biofilm-forming bacteria are relatively resistant to toxicity and resistance to impacts such as load fluctuations, compared to suspended growth microorganisms. Also, the bacteria that adhered to the biofilm are operated at a long SRT (microbiological retention time) until they are desorbed and removed from the carrier, thereby forming a favorable condition for the nitrification reaction. The biofilm maintains aerobic and anaerobic conditions in a single carrier at the same time under aerobic conditions, so that nitrification and denitrification can be simultaneously performed. Thereby, there is an advantage that the power ratio of the sludge return pump and the diameter of the return pipe can be reduced by reducing the flow rate to be transported to the anoxic tank for denitrifying the nitrified sewage. 1 shows an upflow BAF process, which is a general form of a BAF process using a biofilm. As shown in the figure, in the aerobic state of the BAF process, nitrification and organic matter removal are performed, and in anoxic state, denitrification occurs mainly.

On the other hand, the biological removal method using microorganisms utilizes the intake of phosphorus for the growth of microorganisms. By alternately exposing microorganisms to anaerobic conditions and aerobic conditions, it is possible to consume more phosphorus than necessary for growth under aerobic conditions . In this case, organic matter such as VFAs (Volatile Fatty Acids) should be sufficient in anaerobic state, and organic matter should be removed and oxygen rich in aerobic state. It is possible to efficiently remove phosphorus in the wastewater by biological high-level treatment by repeating this anaerobic-aerobic condition.

In the anaerobic state, the heterotrophic bacteria take in organic matter generated through hydrolysis and fermentation. In this case, since there is no O ₂ or NO x-N that can be used as an electron acceptor in the anaerobic state, the electrons and carbon are accumulated as intracellular solids such as polyhydroxyacetate (PHA) and polyhydroxybutyrate (PHB). The synthesis of PHA and PHB requires active enzyme (HSCoA: Acetyl coenzyme A), and the energy required for this is obtained by the decomposition of polyphosphate. In this process, phosphates are released into water bodies.

In the aerobic state, when the phosphorylated microorganism moves to an aerobic state rich in electron acceptors such as O ₂ and NO x-N, the biochemical reaction opposite to the anaerobic state proceeds. That is, PHA and PHB are hydrolyzed to generate HSCoA, and the released electrons are transferred to electron acceptors such as O ₂ and NO x-N and used for ATP synthesis. At this time, phosphorus is treated in the waste water and wastewater by excessively synthesizing an energy storage material polyphosphate using a part of ATP.

The present invention relates to a novel waste water / wastewater treatment system and method capable of effectively removing nitrogen and phosphorus in the wastewater by fusing a method using the biofilm filter paper and a method using activated sludge, that is, the BAF method and the A2O method .

Next, a brief description will be given of the prior arts that exist in the field to which the technology of the present invention belongs, and the technical matters that the present invention intends to differentiate from the prior art will be described.

Japanese Unexamined Patent Application Publication No. 2010-125361 (Jun. 10, 2010) relates to a wastewater treatment system and a purification system, and more particularly to a wastewater treatment system and a purification system that include an anaerobic tank, an aerobic tank, a floating separation tank, And a rare-earth mineral filter medium is installed in the filtration tank body, so that a technology for a drainage treatment system capable of purifying livestock wastewater and the like in a simple and space-saving manner is proposed.

Japanese Patent Application Laid-Open No. 1995-171594 (1995.07.11) relates to a method and apparatus for denitrification and disinfection of sewage. More specifically, a biofilm filtration tank (hereinafter, referred to as " anaerobic tank " And a method and apparatus for treating wastewater capable of highly treating nitrogen and phosphorus, which can provide a nitrification liquid circulation line for circulating a part of the treated water obtained by the biofilm filtration tank to the denitrification unit .

Korean Patent No. 0398912 discloses a method for simultaneously removing nitrogen and phosphorus from wastewater and wastewater. More specifically, the present invention relates to a method for simultaneously removing nitrogen and phosphorus from an anaerobic filter medium and an aerobic biooxidizing filter paper, , Denitrification by denitrification bacteria by denitrifying the returned nitrification water by the anaerobic aerobic filter, removing phosphorus by the aerobic biooxidation filter paper, circulating the treated water of the biooxidized filter paper by 0.2 ~ And a method for simultaneously removing nitrogen and phosphorus in the wastewater.

In the above-mentioned prior arts, there is disclosed a technique of operating a BAF process and an A / O process in combination, or performing a denitrification reaction by circulating treated water of a biooxidized filter paper, There is a difference from the present invention in that the arrangement of the BAF process and the A / O process is different from that of the present invention, and the technology related to piping, conveying technology, and separation introduction is not described.

In the case of sewage having a low C / N ratio, it is difficult to remove 100% of NOx-N from the BAF process effluent. Therefore, the high concentration of DO dissolved in the BAF process effluent is returned to the inside, And is used for aerobic subordinate microorganisms, thereby causing a problem that the denitration rate is further lowered.

The prior art for introducing the inflow sewage into the aerobic filtration process in its entirety is limited in that the anaerobic-aerobic condition is repeated alternately and the high-rate treatment of phosphorus by the bio-P microorganisms can not be performed.

On the other hand, in the prior art in which all the influent sewage is introduced into the A2O process and the phosphorus is biologically treated and then the BAF process is disposed in the subsequent process, the majority of the influent BOD is consumed by the aerobic heterotrophic microorganisms and the biosludge- There is a problem of excessive energy consumption due to an increase of the internal return rate (usually 200%). In addition, there is a limitation that a lot of sites are required when a subsequent BAF process is added in addition to the reaction time required for the A2O process.

The present inventors confirmed that oxidized NOx-N can be used for 100% denitration reaction by injecting NOx-N oxidized form in the BAF process into the anoxic tank of the A2O process which is organically installed with the BAF process. It was completed.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method for anaerobic fermentation, which comprises combining a BAF process using a biofilm filtration system and an A2O process comprising an anaerobic tank, anoxic tank, aerobic tank, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a system for treating waste water and wastewater that effectively removes contaminants and a method thereof.

The present invention also relates to a method for operating a wastewater treatment system in which the two processes are fused, comprising the steps of: dividing the wastewater into wastewater according to nitrogen and phosphorus treatment rates, Processing system and method therefor.

Further, in the operation of the sewage / wastewater treatment system in which the above two processes are fused, the treated water of the BAF process containing NOx-N and DO is supplied to the anoxic tank of the A2O process to increase the nitrogen removal rate And an object thereof is to provide a system for treating a wastewater and a wastewater capable of reducing oxygen injection costs and a method thereof.

The optimal microbial sewage / wastewater treatment system according to an embodiment of the present invention includes an anaerobic filtration membrane part at the lower part and an exhalation filtration membrane part at the upper part. The part of the raw wastewater water flows into the lower part and flows upward A biofilm filtration tank 100 in which denitrification, nitrification and organic matter removal reactions are sequentially performed; The biofilm filtration tank is disposed downstream of the biofilm filtration tank, An anaerobic tank in which dephosphorization is carried out in a divided manner; An anoxic tank disposed downstream of the anaerobic tank and treated with the treated water in the anaerobic tank and treated water of the biofilm filtration tank to perform denitrification; An oxic tank disposed downstream of the anoxic tank and having undergone nitrification by flowing the treated water treated in the anoxic tank; And a sedimentation tank for separating the sludge of the treated water treated in the oxic tank and the symbol water and discharging the symbol water to the final treated water.

50 to 70% of the total volume of the raw water to be introduced is introduced into the biofilm filtration tank, 30 to 50% of the total volume of the raw water and the raw water can be dividedly introduced into the anaerobic tank, To the anaerobic section of the biofilm filtration tank in the nitrification section of the biofilm filtration tank may be operated at 50% to 150% of the treated water volume flow rate of the biofilm filtration tank.

In addition, according to another embodiment of the present invention, in the method of treating wastewater with optimal microorganisms, a part of the raw wastewater is divided into the anaerobic filtration membrane portion of the biofilm filtration tank and the denitrification reaction using the carbon source in the influent water is performed A step of introducing the filtrate into the filtration membrane part of the rear unit; An anaerobic tank, anoxic tank, an oxic tank, and a settling tank are sequentially connected to the anaerobic tank of the A2O process, wherein the treated water of the biofilm filtration tank is discharged after the nitrification reaction is performed in the aerobic filtration membrane portion; Some of the raw water As the anaerobic tank of the A2O process A step of infiltrating; Flowing the treated water from the anaerobic tank to an anoxic tank disposed downstream of the anaerobic tank; Introducing treated water treated in the anoxic tank into an aerobic tank arranged at a rear end of the anoxic tank; Introducing treated water treated in the oxic tank before settlement, which is disposed at the rear end of the oxic tank; Separating the sludge and the symbol water from the settling tank and discharging the symbol water to the final treated water.

The flow rate of the treated water flowing out of the biofilm filtration tank to the anoxic tank may be 50% to 150% of the biofilm filtration tank treated water flow rate.

The present invention relates to a system for treating a sewage / wastewater using an optimal microorganism and a method thereof. By fusing a BAF process and an A 2 O process, nitrogen can be treated stably and efficiently at the winter season, , The costs of chemicals, oxygen supply costs, sludge return pump installation costs, and operation costs can be saved.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an exemplary view for explaining an upflow BAF process, which is a general form of a biofilm filtration tank using a biofilm. FIG.
FIG. 2 is an exemplary view for explaining the structure of a sewage / wastewater advanced treatment system using an optimal microorganism according to an embodiment of the present invention.
FIG. 3 is an exemplary diagram for explaining a site-saving effect of an advanced sewage / wastewater treatment system using an optimal microorganism according to an embodiment of the present invention.
4 is a flowchart for explaining a method of treating a sewage / wastewater using an optimal microorganism according to an embodiment of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

Throughout this specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise. Further, throughout the present specification, BOD is a biological oxygen demand, usually means an organic substance or an organic pollutant used in the art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a system for advanced sewage / wastewater treatment using optimal microorganisms and a method thereof will be described with reference to the accompanying drawings.

The present invention relates to a biofilm filtration tank 100 including an anaerobic filtration membrane part 110 and an aeration filtration membrane part 120 for removing organic matter and nitrogen using denitrifying bacteria and nitrifying bacteria adhering to a biofilm and an anaerobic tank 210, The wastewater treatment function is improved by fusing the A2O process 200 composed of the aerobic tank 220, the oxic tank 230 and the settling tank 240 and using the floating microorganisms to remove organic matter, nitrogen and phosphorus, The present invention relates to a system for treating a wastewater and a wastewater treatment method using the optimum microorganism that can reduce the cost of wastewater treatment.

FIG. 2 is an exemplary view for explaining the structure of a sewage / wastewater advanced treatment system using an optimal microorganism according to an embodiment of the present invention.

As shown in FIG. 2, an optimal microorganism-based sewage / wastewater treatment system according to the present invention is a combination of the A 2 O process 200 downstream of the BAF process 100.

는 송풍기로서 생물막 여과조의 호기 여과막부(120)로 산소를 공급한다.The biofilm filtration tank 100 or BAF process includes an anaerobic filtration membrane 110 and an aeration filtration membrane 120. The A2O process 200 includes an anaerobic tank 210, an anoxic tank 220, an aerobic tank 230, And a settling tank 240. The raw and wastewater raw water is divided into the BAF anoxic tank 110 and the anaerobic tank 210. [ 2

Feeds the oxygen to the breath filtration membrane portion 120 of the biofilm filtration tank as a blower.

50% to 70% of the flow rate of the raw water and the raw wastewater is dividedly introduced into the anaerobic filtration membrane part 110 to perform a denitrification reaction. The denitrification reaction is performed by a denitrifying bacteria which adheres to the fixed carrier of the anaerobic filtration membrane part 110. The organic matter in the wastewater is used as a carbon source to convert nitrogen into gas form in NOx-N, The nitrogen is removed by discharging. The bottom and wastewater from which the nitrogen and organic substances are partially removed from the oxygen-free filtration membrane part 110 flows into the filtration membrane part 120.

In the breath filtration membrane part 120, nitrification reaction is performed. The nitrification reaction is carried out by nitric oxide bacteria adhering to the fixed carrier of the breath filtration membrane part 120. The nitrification reaction part includes an anaerobic filtration membrane part 110 in which BOD is consumed and an aerobic filtration membrane part 120 in which ammonia nitrogen is converted into nitrate nitrogen , The treated water flowing out of the biofilm filtration tank contains substantially no BOD and NH ₄ -N and is rich in NOx-N and PO ₄ -P. In the biofilm filtration tank 100, Is returned to the anaerobic filtration membrane part 110 to perform nitrogen removal through denitrification. At this time, the volume flow rate to be transported is preferably 50% to 150% of the volume of the treated water volume of the biofilm filtration tank supplied to the anoxic tank 200 of the A2O process 200. The return rate is adjusted so that the NOx-N of the biofilm filtration tank treated water becomes 15 mg / L or less and the denitrification reaction is completely carried out when it enters the anaerobic tank of the A2O process. The treated water of the biofilm filtration tank 100 supplied to the anoxic tank 220 of the A2O process 200 is again subjected to nitrogen removal through the denitrification reaction together with the raw wastewater and the raw wastewater which are divided into the A2O process 200.

In the anaerobic tank 210, 30 to 50% of the raw water flow rate flows into the raw wastewater. In the anaerobic tank 210, the phosphorus-containing microorganisms contained in the sludge carried in the sedimentation tank 240 decompose the polyphosphate and release the phosphate into the water body while accumulating electrons and carbon as solid substances in cells such as PHA and PHB.

In the case of general household sewage, the ratio of the fraction flowing into the BAF process and the A2O process is 30% -50%: 50% -70% for A2O: BAF, respectively. In the case of less than 30% of the inflow rate by the A2O process, the amount of VFA (Volatile Fatty Acid) required for overproduction by Bio-P microorganisms is insufficient and the concentration of phosphorus in discharged water becomes high. If more than 50% However, even if 100% of the nitrogen is removed from the BAF process, measures for further removal of nitrogen contained in the 50% sewage introduced into the A2O process are required. Therefore, in order to obtain the optimum effect of the present invention in general sewage, it is preferable to divide 30% -50% inflow sewage into the A2O process.

In the anoxic tank 220, treated water supplied from the biofilm filtration tank 100 supplied from the biofilm filtration tank 100 and wastewater discharged naturally from the anaerobic tank 210 flow into the anoxic tank 220. The bottom / wastewater flowing from the anaerobic tank 210 contains a large amount of organic matter, and the treated water flowing from the biofilm filtration tank 100 is rich in DO and NOx-N. Through this process, the denitrification reaction takes place with the BOD contained in the raw sewage divided by the anoxic tank 220 as a carbon source, the organic matter in the wastewater is reduced, and organic matter is removed from the subsequent aerobic tank 230 And the amount of oxygen required for nitrification can be minimized.

In the aerobic tank 230, the phosphorus and wastewater in the anaerobic tank 210 is removed by a phosphorus-removing microorganism that accumulates high-molecular substances such as PHA and PHB. The phosphorus-removing microorganisms accumulate excessive amounts of polyphosphate in the body during the decomposition of PHA and PHB synthesized in the body. Thus, by disposing microorganisms that ingest excessive phosphorus, .

The waste sludge is removed from the sedimentation tank 240 and the remaining sludge and a part of the lower and wastewater are returned to the anaerobic tank 210 to maintain the concentration of the microorganisms in the system, And then supplied to the anoxic tank 220 to increase the nitrogen removal rate in the wastewater.

The sewage / wastewater system of the present invention as described above can reduce the site required compared with the conventional biological / nitrogen / phosphorus / wastewater system. FIG. 3 is an exemplary diagram for explaining a site-saving effect of an advanced sewage / wastewater treatment system using an optimal microorganism according to an embodiment of the present invention.

As shown in FIG. 3, when the raw sewage / wastewater treatment system using the optimum microorganism of the present invention is supplied with 70% of BAF and 30% of the raw water for the A2O process, 6 hrs and 9.2 hrs nitrogen and phosphorus treatment facilities. Since the general A2O process is operated with an effective HRT of 8 hr (the same as the theoretical HRT), the inventive process can reduce the site by 25% or more.

In addition, the BAF process of the wastewater treatment system of the present invention enables relatively high density nitric oxide bacteria accumulation as compared with the floating growth A2O process. Normally, the percentage of nitrate bacteria in the floating growth A2O method is 5-10%, but the BAF process that filled the fixed carrier can maintain the nitrate bacteria share of 15% -20%. Independent nutrient nitrification bacteria have a growth rate of about 1/5 of that of aerobic heterotrophic bacteria and a rapid decrease in activity below 12 ° C.

Therefore, if the water temperature is below 12 ℃, it is necessary to increase the population of nitrifying bacteria to buffer the decrease in activity due to low water temperature.

The effluent TKN removal rate (microbial uptake and nitrification mechanism) was 95.5% in the BAF process for 2 months. On the other hand, in the suspended growth A2O process, the removal rate of inflow TKN was 40.0%.

In addition, since phosphorus removal microorganisms are used for phosphorus removal, there is no need for a separate chemical treatment facility. In special situations such as upstream of a water source where a high rate of inhalation is required, partial chemical treatment after biological removal can reduce the cost of chemicals such as coagulant and alkali.

In addition, NOx-N and DO discharged from the BAF process are injected into the anoxic tank of the A2O process to be used for removing BOD, thereby reducing the oxygen injection cost for BOD oxidation. In the general A2O process, The transfer pump consumes a large amount of moving energy. In contrast, in the present invention, 50 to 70% of the wastewater is injected in the BAF process, so the internal return rate is 1 The energy required for the transportation is only 50 to 70% of that of the A2O process, which is 30-50% less than the conventional A2O process. In particular, injecting the treated water of the BAF process into the anoxic tank of the A2O process has the advantage of achieving the effect of internal transportation and not requiring pumping energy.

Hereinafter, the present invention will be described in more detail by way of examples, but it should be apparent that the present invention is not limited by the following examples.

Example 1, Comparative Example 1 and Comparative Example 2 were carried out using sewage treatment plant (Yongdeok Resupia) in Yongin-si, Gyeonggi-do.

≪ Example 1 >

For the same experimental reactor as in FIG. 2, the raw sewage was divided into 7: 3 portions for BAF and A2O processes, respectively, and the BAF process effluent was injected into the anoxic tank of the A2O process.

≪ Comparative Example 1-A2O Process >

 The A2O process was carried out in the same size as the A2O process used in Example 1, and the internal transfer and sludge return ratios were applied in the same manner as in Example 1. On the other hand, in the case of the A2O method, the sludge loss due to the high concentration MLSS occurred during the operation with the short reaction time (HRT), and the SRT was operated at 5d by increasing the sludge disposal amount.

≪ Comparative Example 2-BAF alone >

In order to verify the nitrification efficiency of the BAF process, it was operated at an effective reaction time of 2 hours and filled with a floating carrier having a diameter of 2-4 mm of PE material.

The operating conditions of Example 1, Comparative Example 1 and Comparative Example 2 are shown in the following table.

The following table shows the results of comparative tests for individual methods. In Example 1 and Comparative Example 1, the removal rates of BOD and SS were more than 96.4%. On the other hand, the removal efficiency of reducing nitrogen TKN was 96.9% in Example 1 and 64.6% in the case of A2O alone, showing that the removal efficiency of Example 1 was 32.3%.

Although the reaction time in the exhalation state of Comparative Example 1 and Comparative Example 2 was the same at 2.5 hours, it was judged that the TKN removal rate of Example 1 was much higher than that of the high density nitrifying bacteria culture which is an advantage of the BAF process.

On the other hand, the phosphorus removal rates of Comparative Example 1 and Comparative Example 2 show a very large difference. In Comparative Example 2, the phosphorus removal rate was as low as 19.8%, whereas in Comparative Example 1, the phosphorus removal rate was as high as 94.6%. That is, the A2O process was relatively superior to the BAF process in the phosphorus removal process, but the BAF process was superior in the nitrogen removal process. Example 1 shows that by combining the advantages of the A2O process with the advantages of the BAF process, Nitrogen, and phosphorus removal rate of the exhaust gas.

4 is a flowchart for explaining a method of treating a sewage / wastewater using an optimal microorganism according to an embodiment of the present invention.

As shown in FIG. 4, according to the present invention, the bottom / wastewater treatment method using the optimal microorganisms is characterized in that the raw wastewater fed into the bottom / wastewater treatment system is first treated with the anaerobic filtration membrane of the biofilm filtration tank and the anaerobic tank (S101). In general living sewage, the fractional inflow rate to the BAF process is in the range of 50% -70%. In the condition that the nitrogen removal rate should be increased according to the characteristics of the influent water, the inflow rate to the biofilm filtration tank is increased, Conversely, if the condition is to be improved, the operation is performed to reduce the inflow rate.

The denitrification reaction is carried out using the carbon source by the denitrifying bacteria in the anaerobic filtration membrane to remove the nitrogen from the raw wastewater fed into the biofilm filtration tank (S102). The bottom / wastewater passing through the anaerobic filtration membrane part flows into the breath filtration membrane part 120, and the nitrification reaction is performed by the nitrifying bacteria in the breath filtration membrane part (S103). A part of the treated water subjected to nitrification in the aerobic filtration membrane part is returned to the anaerobic filtration part, and the nitrification water is further denitrified in the biofilm filtration tank, and a part of the treated water is supplied to the anaerobic tank of the A2O process (S104).

In the anaerobic tank of the A2O process, phosphorous is discharged to the water body through a process of synthesizing a polymer material in vivo such as PHA and PHB by using the carbon in the bottom / wastewater into which the phosphorylated microorganism has been infiltrated (S105). In the anaerobic tank of the A2O process, treated wastewater discharged from the anaerobic tank and treated water of the biofilm filtration tank are introduced, and denitrification is performed to remove nitrogen (S106). Thereafter, the nitrification reaction takes place again in the aerobic tank of the A2O process. Inorganic microorganisms synthesized from the anaerobic tank, such as PHA and PHB, accumulate excessive polyphosphate in the body while decomposing the PHA and PHA. - Remove the phosphorus in the wastewater (S107). In the settling tank 240 of the A2O process, the waste sludge is removed and the remaining sludge is returned to the anaerobic tank (S108).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

100: Biofilm filtration tank 110: Anaerobic filtration membrane
120: Aerobic filtration membrane part 200: A2O process
210: Anaerobic tank 220: Anoxic tank
230: aerobic tank 240: settling tank

Claims (8)

A biofilm filtration tank 100 including an anaerobic filtration membrane section at a lower portion and an exhalation filtration membrane section at an upper portion and a denitrification and nitrification and an organic matter removal reaction are sequentially performed while a part of the original wastewater flows into the lower portion and flows upward;
An anaerobic tank disposed downstream of the biofilm filtration tank and having a part of the raw water and the wastewater to be partly inflowed to perform descent;
An anoxic tank disposed downstream of the anaerobic tank and treated with the treated water in the anaerobic tank and treated water of the biofilm filtration tank to perform denitrification;
An oxic tank disposed downstream of the anoxic tank and having undergone nitrification by flowing the treated water treated in the anoxic tank;
And a sedimentation tank for separating the sludge of the treated water treated in the oxic tank and the symbol water and discharging the symbol water to the final treated water. The method according to claim 1,
50 to 70% of the total volume of the raw water to be introduced is introduced into the biofilm filtration tank, and 30 to 50% of the total volume of the raw water and the wastewater is divided into anaerobically divided wastewater. . The method according to claim 1,
Wherein 50% to 150% of the flow rate of the treated water in the biofilm filtration tank flowing into the anoxic tank from the treated water flowing out from the biofilm filtration tank is returned to the anaerobic filtration membrane. The method according to claim 1,
Wherein some of the sludge in the settling tank is transported to the anaerobic tank (210). A part of the raw wastewater is divided into an oxygen-free filtration part of a biofilm filtration tank, a denitrification reaction is performed using a carbon source in the influent water, and then flows into the breath filtration part;
An anaerobic tank, anoxic tank, an oxic tank, and a settling tank are sequentially connected to the anaerobic tank of the A2O process, wherein the treated water of the biofilm filtration tank is discharged after the nitrification reaction is performed in the aerobic filtration membrane portion;
Some of the raw water As the anaerobic tank of the A2O process A step of infiltrating;
Flowing the treated water from the anaerobic tank to an anoxic tank disposed downstream of the anaerobic tank;
Introducing treated water treated in the anoxic tank into an aerobic tank arranged at a rear end of the anoxic tank;
Introducing treated water treated in the oxic tank before settlement, which is disposed at the rear end of the oxic tank;
Separating the sludge and the representative water from the settling tank and discharging the representative water to the final treated water. 6. The method of claim 5,
50 to 70% of the total volume of the raw water and the wastewater is introduced into the biofilm filtration tank, and 30 to 50% of the total volume of the raw water and the wastewater is divided into the anaerobic tank. . 6. The method of claim 5,
Wherein 50% to 150% of the flow rate of the treated water in the biofilm filtration tank flowing into the anoxic tank from the treated water flowing out of the biofilm filtration tank is returned to the anaerobic filtration membrane. 6. The method of claim 5,
Wherein some of the sludge in the settling tank is transported to the anaerobic tank (210).

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