Method for treating organic wastewater by one membrane and three bacterial strains

Abstract

The application discloses a one-membrane three-strain treatment method for organic wastewater, which comprises the following steps: arranging fillers in a one-membrane three-strain pool and arranging an aeration device at the bottom; arranging anaerobic bacteria, facultative bacteria and aerobic bacteria in layers from inside to outside in sequence, and fixing and growing microbial strain sludge on the fillers in a biological membrane mode, while adding microbial strain sludge into an anaerobic hydrolysis pool; pumping the organic wastewater into an aeration adjusting pool for aeration treatment and air floatation treatment, then conveying the wastewater into the anaerobic hydrolysis pool for hydrolysis acidification of pollutants, and conveying the wastewater into the one-membrane three-strain pool at a preset rate for organic matter treatment; carrying out coagulation sedimentation and filtration on the organic wastewater after the organic matter treatment, collecting treatment residual sludge, and discharging treated clean water. Through the technical scheme, a stable ecological system can be formed for organic matter treatment, and finally the organic pollutant wastewater can be effectively controlled within the discharge index range, so that the water quality of the effluent can be stably up to the standard.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, especially to a one-membrane three-strain treatment method of organic wastewater. BACKGROUND

[0002] Printing and dyeing enterprises gradually upgrade the wastewater impurity removal and recycling technology, and wastewater recycling and resource utilization are also the development trend of wastewater treatment, which has huge market demand, and wastewater zero discharge and resource utilization have become one of the key development directions of many environmental protection enterprises. In order to further improve the clean production level of the printing and dyeing industry and reduce the waste of water and salt resources, it is necessary to break through the key technologies of impurity removal and resource utilization of printing and dyeing wastewater. SUMMARY

[0003] In view of the above problems, the present application provides a one-membrane three-strain treatment method of organic wastewater, which removes pollutants in organic wastewater by two-stage contact oxidation method and one-membrane three-strain treatment method. The treatment method combining anaerobic and aerobic processes can first hydrolyze and acidify high molecular substances and then fully degrade organic matter in wastewater. The one-membrane three-strain method can form a stable ecological system for organic matter treatment, and finally effectively control the organic pollutant wastewater within the discharge index range, ensuring that the effluent quality is stable and meets the standards.

[0004] To achieve the above purpose, the present application provides a one-membrane three-strain treatment method of organic wastewater, comprising:

[0005] A filler is arranged in the one-membrane three-strain tank, and an aeration device is arranged at the bottom of the one-membrane three-strain tank;

[0006] The anaerobic bacteria, facultative bacteria and aerobic bacteria are arranged in the order of inside to outside layer by layer, and the microbial strain sludge is fixed and grown on the filler in the form of biofilm, and the microbial strain sludge is added to the anaerobic hydrolysis tank;

[0007] After the organic wastewater is pumped into the aeration adjustment tank for aeration treatment and air flotation treatment, it is transported to the anaerobic hydrolysis tank for hydrolysis and acidification of pollutants;

[0008] The organic wastewater after hydrolysis and acidification is transported to the one-membrane three-strain tank at a preset rate for organic matter treatment;

[0009] The organic wastewater after organic matter treatment is subjected to coagulation sedimentation and filtration, and the treatment residue sludge is collected, and the treated clear water is discharged.

[0010] In the above technical solution, preferably, in the process of fixing and growing the microbial strain sludge on the filler in the form of biofilm, a step-by-step bacteria cultivation method is adopted;

[0011] Firstly, domestic sewage is introduced and aeration is carried out at a preset frequency to realize rapid proliferation of the microbial sludge, and after the microbial sludge grows and proliferates to a preset thickness, the domestic sewage during the rapid proliferation is discharged and treated.

[0012] Then, the strains in the microbial sludge are stably proliferated by their own proliferation characteristics during the organic matter treatment of the organic wastewater.

[0013] In the technical scheme, preferably, the growth amount ratio of the anaerobic bacteria, the facultative bacteria and the aerobic bacteria in the microbial sludge is 1:1.5:2.5.

[0014] In the technical scheme, preferably, the COD removal rate or sludge settling ratio SV30 is monitored during the organic matter treatment of the one-membrane three-strain pool, and when the COD removal rate or sludge settling ratio SV30 decreases at a rate exceeding a preset value, the microbial sludge is recovered and grown in a rapid proliferation mode until the COD removal rate rises to more than 50% or the sludge settling ratio SV30 no longer decreases.

[0015] In the technical scheme, preferably, during the process of conveying the organic wastewater to the one-membrane three-strain pool for organic matter treatment, the water inflow amount is pumped in at 1%-2% of the volume of the one-membrane three-strain pool, and the water inflow amount is gradually increased by 2% per day until a preset daily water inflow amount is reached.

[0016] In the technical scheme, preferably, the microbial sludge is uniformly added to the filler in a preset order, the temperature is maintained above 15 degrees Celsius, the aeration device is turned on, and the phosphorus source is uniformly added to the filler and the anaerobic hydrolysis pool in a preset ratio.

[0017] In the technical scheme, preferably, during the process of treating the organic wastewater in the one-membrane three-strain pool, the dissolved oxygen DO content in the pool is maintained at 2-6 mg / L, and the sludge settling ratio SV30 is controlled at 25%-45%.

[0018] In the technical scheme, preferably, the microorganisms in the microbial sludge include Daphnia, Daphnia, Trichocerca and Philodina, and the strains include nitrifying strains, denitrifying strains and nitrifying-denitrifying composite strains.

[0019] In the technical scheme, preferably, the filler is a combined fiber filler.

[0020] In the technical scheme, preferably, in the one-membrane three-strain pool, the microbial strains exist in the sludge between the fillers and are suspended in the pool water. In the technical scheme, preferably, in the one-membrane three-strain pool, the microbial strains exist in the sludge between the fillers and are suspended in the pool water.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: pollutants in organic wastewater are removed by a two-stage contact oxidation method and a membrane-based three-strain treatment method. The anaerobic-aerobic treatment method can first hydrolyze and acidify the high molecular weight substances and then fully degrade the organic matter in the wastewater. The membrane-based three-strain treatment method can form a stable ecosystem to treat organic matter. Ultimately, the organic pollutant wastewater can be effectively controlled within the discharge index range, ensuring that the effluent water quality is stable and meets the standards. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of a one-membrane three-bacterial-strain treatment method for organic wastewater disclosed in one embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings:

[0025] like Figure 1 As shown, a method for treating organic wastewater using a single membrane with three bacterial strains according to the present invention includes:

[0026] Packing material is installed in a membrane-three-inoculum tank, and an aeration device is installed at the bottom of the membrane-three-inoculum tank;

[0027] Following the order of anaerobic bacteria, facultative anaerobic bacteria, and aerobic bacteria arranged layer by layer from the inside out, the microbial sludge is fixed and grown on the packing material in the form of a biofilm, while microbial sludge is added to the anaerobic hydrolysis tank.

[0028] After being pumped into the aeration equalization tank for aeration and flotation treatment, the organic wastewater is transported to the anaerobic hydrolysis tank for hydrolysis and acidification of pollutants.

[0029] The hydrolyzed and acidified organic wastewater is transported to a membrane-three-bacteria tank at a preset rate for organic matter treatment.

[0030] The organic wastewater after organic matter treatment is subjected to coagulation, sedimentation and filtration, the treatment residue sludge is collected and treated clean water is discharged.

[0031] In the embodiment, the pollutants in the organic wastewater are removed by a two-stage contact oxidation method and a membrane three-strain treatment method, the treatment method combining anaerobic and aerobic processes can hydrolyze and acidify the high molecular substances and then fully degrade the organic matters in the wastewater, the membrane three-strain can form a stable ecological system for organic matter treatment, and finally the organic pollutant wastewater can be effectively controlled within the discharge index range to ensure that the effluent quality is stable and meets the standards.

[0032] In the implementation process, for the printing and dyeing wastewater and other organic wastewater, a two-stage contact oxidation method and a membrane three-strain treatment method are used to remove COD, BOD, ammonia nitrogen, total phosphorus and other pollutants. Specifically, first, collect technical process data related to microbial treatment of organic wastewater, classify, analyze, research, and then carry out systematic screening of high-quality microbial species for comparison, focusing on analyzing, researching, inducing and summarizing various biological fillers. Finally, by combining biological fillers and microbial treatment, the membrane three-strain treatment method for organic wastewater of the present application is adopted, which meets the path of solving the difficult treatment of high-concentration organic wastewater, is reasonable in technology, stable in operation, and the effluent meets the standards, and has lower harm to the environment.

[0033] In the membrane three-strain treatment process, the use of high-quality microorganisms can remove a large amount of organic matter in the composite wastewater, and after system treatment, the pollutant content in the water can be greatly reduced, and the microbial community of the water treatment system can not be damaged, so that the stability of the water environment system can be ensured.

[0034] In the above embodiment, preferably, in the process of fixing and growing the microbial strain sludge in the form of a biological membrane on the filler, a step-by-step culture method is used to realize the culture and domestication of the sludge. There are many types of microorganisms in nature, which have strong adaptability and diverse metabolic modes. The method of one membrane three-strains is used to adjust and treat the water quality in structure.

[0035] In the step-by-step culture method, domestic sewage is first introduced and aeration is performed at a predetermined frequency to realize rapid proliferation of the microbial strain sludge, and after the microbial strain sludge grows and proliferates to a predetermined thickness according to a predetermined mode, the domestic sewage during the rapid proliferation is discharged and treated.

[0036] The strains in the microbial strain sludge can stably proliferate by their own proliferation characteristics during the organic matter treatment of the organic wastewater.

[0037] In the above embodiment, the strains include nitrifying strains, denitrifying strains and nitrifying-denitrifying composite strains, which can be classified according to different oxygen demands and different removal objects.

[0038] (1) Nitrobacteria: aerobic bacteria, including nitrate bacteria, nitrite bacteria, etc. This kind of bacteria lives in aerobic water or sand layer, and plays an important role in sewage purification process, widely exists in every corner of nature, and research has found that there are thousands of nitrobacteria, which mainly removes ammonia nitrogen and degrades part of COD. Strong sewage treatment bacteria can effectively remove ammonia nitrogen, so that the effluent can meet the discharge standard.

[0039] (2) Denitrifying bacteria: not completely opposite to nitrifying bacteria, which uses oxygen in nitrate to oxidize organic matter to obtain energy required for its activity, and can convert nitrate nitrogen to nitrogen. In aquaculture industry, it plays a role in degrading COD, accelerating hydrolysis and acidification process, and improving treatment efficiency.

[0040] (3) Nitrate and denitrifying bacteria: in the increasingly complex sewage treatment situation, the use of nitrifying or denitrifying bacteria alone is more and more difficult to achieve bacterial balance. The inaccurate ratio of nitrification and denitrification will cause a lot of energy and bacterial waste, and it is also difficult to achieve the expected effect of sewage treatment. Compound bacteria can adjust itself according to the actual water quality, achieve bacterial balance, and the effect of sewage treatment is naturally better.

[0041] Treatment bacteria are specially cultured according to the types of sewage pollutants, and have special degradation ability for sewage, such as common nitrifying bacteria for removing organic matter and denitrifying bacteria for removing nitrogen. Bacteria rely on metabolism to decompose organic matter in wastewater, so a certain time is needed for wastewater and bacteria to mix fully to achieve the desired effect. The reaction time is longer than chemical treatment, but the treatment effect of bacteria is remarkable, the cost is low, and no one needs to watch during operation, so it can be widely used.

[0042] The cycle of biochemical bacteria depends on the water temperature and water quality of wastewater. When the water temperature is higher than 15℃, the bacteria cultivation process is faster, and when the water temperature is lower than 15℃, the sludge acclimation time is longer, so the sludge cultivation and acclimation should be carried out in May-November as much as possible. When debugging in winter, the water temperature should be increased, and the temperature of biochemical tank should be guaranteed, generally not less than 15℃. As for the water quality of wastewater, non-toxic, harmless and easily biodegradable wastewater, the biochemical bacteria cultivation time is generally 10-20 days, while toxic, harmful and difficult to biodegrade wastewater needs a longer process, about 30-60 days or even longer.

[0043] For chemical wastewater or wastewater with poor biodegradability, the above step-by-step bacteria cultivation method should be adopted.

[0044] The purpose of rapid proliferation is to enable sludge to quickly grow onto the combined packing material. Generally, the microorganisms in the purchased sludge are damaged to varying degrees during dewatering or transportation. They need a good living environment to recover and grow in the new environment. If organic wastewater is used directly for acclimation at this time, it will inevitably lead to the death of a large number of microorganisms. Therefore, in the first stage, a portion of domestic sewage can be used for cultivation, aerated twice a day, with each aeration in the aerobic tank lasting 8 hours, to enable the microorganisms to recover and reproduce quickly. This method is called rapid proliferation. During the rapid proliferation period, the wastewater in the biological treatment tank can be discharged through the sludge acclimation pipe, and the water can be discharged after the sludge has settled for 4-8 hours. The rapid proliferation period is generally 7-10 days. Microorganisms grow and reproduce on the membrane, gradually producing anaerobic bacteria, facultative anaerobic bacteria, and aerobic bacteria from the inside out, creating a stable ecosystem. When subjected to external water quality shocks, the three types of bacteria can resist the shocks and maintain the stability of the system.

[0045] In the above embodiments, preferably, the growth ratio of anaerobic bacteria, facultative anaerobic bacteria, and aerobic bacteria in the microbial sludge is 1:1.5:2.5, enabling them to work synergistically to resist shocks and improve the system's stability in treating different types of organic pollutants. Furthermore, shocks (such as large volumes of water or high concentrations) should be avoided during sludge acclimation; once the microbial cultivation is complete, normal operation can commence.

[0046] In the above embodiments, preferably, the COD removal rate or sludge settling ratio SV30 is monitored daily during organic matter treatment in the membrane-triple microbial incubator. When the rate of decline of the COD removal rate or sludge settling ratio SV30 exceeds the preset value, the increasing influent flow of wastewater should be stopped immediately, and the microbial sludge should be restored to growth through rapid proliferation until the COD removal rate rises to more than 50% or the sludge settling ratio SV30 stops declining.

[0047] In the above embodiment, preferably, during the process of transporting organic wastewater to the membrane-triple microbial incubator for organic matter treatment, the influent volume on the first day is based on the volume of the membrane-triple microbial incubator, for example, per 100m³. 3 Pump in 1%-2% of the volume of the three-inoculum membrane tank, and gradually increase the influent volume by 2% per day until the preset daily influent volume is reached. As the wastewater pumping volume gradually increases, the pumping volume of domestic sewage should be reduced accordingly until the addition is stopped, or waste alcohol can be added proportionally (1 kg of waste alcohol is calculated as 1.5 kg of COD).

[0048] In the above embodiments, preferably, microbial sludge is added evenly to the packing material in a preset order, the temperature is kept above 15 degrees Celsius, the aeration device is turned on at the same time, and phosphorus source is added evenly to the packing material and the anaerobic hydrolysis tank in a preset ratio.

[0049] Specifically, in the process of adding microbial sludge, the adding conditions are as follows:

[0050] ① Water cannot be added when the activated sludge is added.

[0051] ② The fan and other devices must be fully opened at the same time when the activated sludge is added, so as to ensure that the activated sludge added into the pool body will not deposit, and at the same time, sufficient oxygen source is provided for the activated sludge;

[0052] ③ The activated sludge must be uniformly added into the biochemical zone to ensure that the sludge does not appear in the accumulation phenomenon in the biochemical zone;

[0053] ④ Considering that the temperature is relatively low at present, the activated sludge transported to the plant cannot be overnight, and should be added in time, that is, the activated sludge is added as soon as it arrives, to ensure the activity of the sludge.

[0054] The adding method is as follows:

[0055] The activated sludge transported is directly added by using a conveyor or pumped into the biochemical zone.

[0056] 30 tons of activated sludge is added to the anaerobic tank, and 30 tons of activated sludge is added to the first and second contact oxidation tanks respectively, a total of 90 tons of activated sludge is needed.

[0057] In addition, according to the needs of microbial growth, 100 kg of sodium dihydrogen phosphate needs to be added to supplement the phosphorus source needed by microorganisms, and the main adding positions are the aeration adjustment tank and the one-membrane three-strain tank, and the anaerobic hydrolysis tank is supplemented. The adding amount is small at the beginning of the debugging process, and after the microorganisms are attached to the filler, the adding amount is increased to 3-4 times of the original.

[0058] In the above embodiment, preferably, in the process of treating organic waste water in the one-membrane three-strain tank, the dissolved oxygen DO content in the tank is maintained at 2 mg / L-6 mg / L, and the sludge settling ratio SV30 is controlled at 25%-45%. If it exceeds 50%, the sludge should be discharged in time. The equipment must be one-use one-backup, and keep 24 hours continuous operation, finally ensure that the effluent water quality is qualified and C:N:P=100:5:1.

[0059] In addition, anaerobic treatment combined with aerobic method is not the traditional anaerobic digestion, and its hydraulic retention time (HRT) is generally 3-5 h, only hydrolysis and acidification occurs. The process flow is mainly aimed at some high molecular substances with poor biodegradability in printing and dyeing wastewater, expecting that they are hydrolyzed and acidified in the anaerobic section to become smaller molecules, thereby improving the biodegradability of the wastewater and creating conditions for aerobic treatment. By using this flow, the problems of PVA and dyes are better solved. Another major feature of this flow is that the excess sludge produced in the aerobic section is completely returned to the anaerobic section, and the anaerobic section has a longer solid retention time (SRT), which is beneficial to sludge anaerobic digestion, thereby significantly reducing the amount of excess activated sludge in the entire system. Therefore, the anaerobic section in the anaerobic-aerobic system has a dual role: one is to pretreat the wastewater, improve its biodegradability, and adsorb and degrade part of the organic matter; the other is to digest the excess sludge in the system.

[0060] In the above embodiment, preferably, the microorganisms in the microbial strain sludge include Vorticella, Blepharisma, Aschoffia and Euplotes.

[0061] Specifically, the specific characteristics of each of the above microorganisms include:

[0062] (I) Vorticella

[0063] (1) Morphological characteristics: bell-shaped, the edge of the front port is wider than the body, and the rear end has a bell handle with stretchability. The endoplasm contains many oval food vacuoles, often with some yellow color.

[0064] (2) Activity characteristics: fixed growth in bacterial slime.

[0065] (3) Indicative significance: when a large number of Vorticella appear in the aeration tank at the initial stage of operation, it indicates that the activated sludge has matured and the oxygenation is normal.

[0066] (II) Blepharisma

[0067] (1) Morphological characteristics: similar to Vorticella, with an enlarged surrounding port lip at the front end. The colony, the handle has no muscle filament and does not contract.

[0068] (2) Activity characteristics: fixed growth, and individual species live in plankton.

[0069] (3) Indicative effect: Vorticella, cover insects, rotifers, etc. appear at the same time when the water quality is clear and the effluent is clear and transparent. However, a large number of Blepharisma appear in sanitary wastewater, which is a sign of sludge swelling and deflocculation.

[0070] (III) Aschoffia (also known as plate shell insect)

[0071] (1) Morphological characteristics: The body is grenade-shaped, with hardened exine, and the surface is surrounded by orderly arranged exine shell plates. From front to back, the shell plates are separated into six segments by transverse grooves, each with a certain form and number of "windows". The posterior end of the perianal plate is rounded, often with 2 to 3 spines. The body cilia are evenly distributed in the longitudinal direction of the shell plate. The cytostome is surrounded by cilia, and the cytostomal stylet is thin.

[0072] (2) Activity characteristics: The swimming speed is fast, and it is not suitable for moving in the mycelium due to the lack of crawling bristles, and it often moves outside the mycelium.

[0073] (3) Indicating effect: It often appears under low BOD load and high dissolved oxygen concentration, and the treated water has low BOD.

[0074] (Four) Euplotes

[0075] (1) Morphological characteristics: The body is solid and will not bend or change shape, it is wide oval, the back is often convex, the abdomen is flat, the posterior is less narrow than the anterior, the posterior is rounded, the oral margin area is large and long, there are 7 anterior tactile hairs, 5 anal tactile hairs, 4 tail tactile hairs, the stretchable bubble is located on the right side of the posterior half, and the large nucleus is in the form of a very long band.

[0076] (2) Activity characteristics: It has the ability to crawl in the mycelium due to the presence of cilia and bristles.

[0077] (3) Indicating effect: It often appears under low BOD load, and the treated water BOD is usually around 10 mg / l.

[0078] In the above embodiment, preferably, the filler is a combined fiber filler. Specifically, the filler in the present application uses a microbial carrier with a large specific surface area, which plays an important role in the amount of biological solids, oxygen utilization rate, water flow conditions, and the contact between wastewater and organisms in the contact oxidation tank, and is an important factor affecting the treatment effect of the biological contact oxidation tank. Through the arrangement of the combined filler, a mode of one membrane and multiple strains can be realized, which is the key technology of the present application.

[0079] In the above embodiment, preferably, in the one-membrane three-strain tank, part of the microbial strains exist in the sludge between the fillers, and part of them are suspended in the tank water, so that it has the characteristics of both activated sludge method and biological filter.

[0080] The biological contact oxidation method is a biological membrane method process between activated sludge method and biological filter, which is characterized by setting fillers in the tank, aerating the tank bottom to oxygenate the wastewater, and keeping the wastewater in the tank in a flowing state to ensure that the wastewater is in full contact with the fillers immersed in the wastewater, avoiding the defect that the wastewater and fillers in the biological contact oxidation tank do not contact evenly.

[0081] The oxygen required by the microorganisms in the biological contact oxidation method is usually supplied by air blowing aeration. After the biological membrane grows to a certain thickness, the microorganisms near the filler wall carry out anaerobic metabolism due to the lack of oxygen, and the gas produced and the scouring effect caused by the aeration will cause the biological membrane to fall off and promote the growth of new biological membrane, forming the metabolism of the biological membrane. The falling biological membrane will flow out of the pool with the effluent. The biological contact oxidation method has the following characteristics:

[0082] ① Due to the large specific surface area of the filler, the oxygenation condition in the pool is good, and the amount of biological solids per unit volume in the pool is high, so the biological contact oxidation pool has a high volumetric load;

[0083] ② Since the biological contact oxidation pool has a large amount of biological solids and the water flow is completely mixed, it has strong adaptability to sudden changes in water quality and quantity;

[0084] ③ The amount of residual sludge is small, there is no problem of sludge bulking, and the operation and management are simple.

[0085] According to the organic wastewater treatment method disclosed in the above embodiments, the implementation significance includes:

[0086] Economic benefits: prevent secondary environmental pollution, maintain water quality safety in industrial parks and other areas, and ensure people's environmental safety.

[0087] Social benefits: reduce the emission of pollution factors, effectively improve the regional environment, and further protect the water, air, and soil environmental quality of the Xingtai Industrial Park.

[0088] Ecological benefit indicators: COD reduction of 1314 tons / year, organic matter reduction of 2357 tons / year, ammonia nitrogen reduction of 6.57 tons / year, BOD reduction of 262 tons / year, and raw water reduction rate of more than 90%.

[0089] Sustainable impact indicators: after the implementation of the project, the environmental quality is effectively improved, and the happiness index of local residents is effectively improved. The environmental impact on the industrial park is small, and it has a positive significance for ecological restoration.

[0090] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for treating organic wastewater using a single membrane with three bacterial strains, characterized in that, The application relates to a method for treating organic wastewater. The method comprises the following steps: filling materials are arranged in a membrane three-strain pool, and an aeration device is arranged at the bottom of the membrane three-strain pool; microbial strain sludge is arranged on the filling materials in a biological membrane mode according to the sequence of anaerobic bacteria, facultative bacteria and aerobic bacteria from inside to outside, and the microbial strain sludge is added into an anaerobic hydrolysis pool; organic wastewater is pumped into an aeration adjusting pool for aeration treatment and air floatation treatment, and then is delivered into the anaerobic hydrolysis pool for hydrolysis acidification of pollutants; the hydrolysis acidified organic wastewater is delivered into the membrane three-strain pool at a preset rate for organic matter treatment; the organic matter treated organic wastewater is subjected to coagulation sedimentation and filtration, and treated residue sludge is collected and discharged, and treated clean water is discharged; in the process of growing the microbial strain sludge on the filling materials in a biological membrane mode, a step-by-step cultivation method is adopted; firstly, domestic sewage is introduced and aeration is carried out at a preset frequency to realize rapid proliferation of the microbial strain sludge, and the domestic sewage during the rapid proliferation is discharged after the microbial strain sludge grows and proliferates to a preset thickness according to a preset mode; secondly, the microbial strain sludge is stably proliferated by the strain self-reproduction characteristics during the organic matter treatment of the organic wastewater; in the process of delivering the organic wastewater into the membrane three-strain pool for organic matter treatment, the water inflow amount is 1%-2% of the volume of the membrane three-strain pool on the first day, and the water inflow amount is gradually increased by 2% per day until a preset daily water inflow amount is reached; the growth amount ratio of the anaerobic bacteria, the facultative bacteria and the aerobic bacteria in the microbial strain sludge is 1:1.5:2.5; 2. The method of claim 1, wherein the three bacteria species are selected from the group consisting of Pseudomonas putida, Bacillus subtilis, and Bacillus licheniformis. the microorganisms in the microbial strain sludge include vorticella, lepadella, tritrichomonas and paramoecium, and the strains include nitrifying strains, denitrifying strains and nitrifying-denitrifying composite strains.

3. The method of claim 1, wherein the three bacteria species are selected from the group consisting of Pseudomonas putida, Bacillus subtilis, and Bacillus thuringiensis. the COD removal rate or sludge settling ratio SV30 is monitored during the organic matter treatment of the membrane three-strain pool, and the microbial strain sludge is recovered and grown in a rapid proliferation mode when the COD removal rate or sludge settling ratio SV30 decreases at a rate exceeding a preset value until the COD removal rate is increased to more than 50% or the sludge settling ratio SV30 no longer decreases.

4. The method according to claim 1, wherein the three bacteria species are selected from the group consisting of Pseudomonas putida, Bacillus subtilis, and Bacillus thuringiensis. the microbial strain sludge is uniformly added into the filling materials according to a preset sequence, the temperature is kept above 15 DEG C, the aeration device is started, and phosphorus sources are uniformly added into the filling materials and the anaerobic hydrolysis pool according to preset proportions.

5. The method according to claim 1, wherein the three bacteria species are selected from the group consisting of Pseudomonas putida, Bacillus subtilis, and Bacillus thuringiensis. during the organic matter treatment of the organic wastewater in the membrane three-strain pool, the dissolved oxygen DO content in the pool is kept at 2 mg / L-6 mg / L, and the sludge settling ratio SV30 is controlled at 25%-45%.

6. The method according to claim 5, wherein the three bacteria species are selected from the group consisting of Pseudomonas putida, Bacillus subtilis, and Bacillus thuringiensis. the filling materials are combined fiber type filling materials. in the membrane three-strain pool, the microbial strains exist in sludge between the filling materials and are suspended in pool water.

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