CN113003723A - Preparation method of coupled flora biofilm - Google Patents
Preparation method of coupled flora biofilm Download PDFInfo
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- CN113003723A CN113003723A CN202110180598.7A CN202110180598A CN113003723A CN 113003723 A CN113003723 A CN 113003723A CN 202110180598 A CN202110180598 A CN 202110180598A CN 113003723 A CN113003723 A CN 113003723A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/004—Apparatus and plants for the biological treatment of water, waste water or sewage comprising a selector reactor for promoting floc-forming or other bacteria
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to the technical field of biological sewage treatment, in particular to a preparation method of a coupled flora biofilm. The invention comprises the following steps: biological modification of the carrier; intermittently running to form an initial biofilm of slow-growing flora; continuously operating and reinforcing the biofilm of the slow-growing flora; intermittently operating the initial biomass of the additional fast growing flora; continuously operating the coupling bacterium biofilm. Based on the growth characteristics of functional microorganisms in a water treatment system, the method fully exerts the advantages of various functional floras and makes up for short plates of the functional floras in the biofilm formation process by organically combining carrier biological modification, system intermittent operation and continuous operation, establishes a high-efficiency and stable sewage biological denitrification system, and solves the problems of slow start and poor stability of a multi-florae coupled sewage biological denitrification system. The method is simple and convenient and is easy to realize.
Description
Technical Field
The invention relates to the technical field of biological sewage treatment, in particular to a preparation method of a coupled flora biofilm.
Background
The biological nitrogen removal of the sewage is a main way for removing nitrogen pollution of the wastewater, and the method has the advantages of low cost, thorough removal of pollutants and environmental friendliness.
The biofilm is the most feasible way for realizing the coupling and the efficient management of the multifunctional microbial flora of the biological denitrification system, but the denitrification system generally relates to a plurality of functional microbial floras, the living habits (such as DO, temperature, doubling time and the like) of the microbial floras are different, and how to efficiently and orderly couple the functional microbial floras to form the functional biofilm is a problem which needs to be solved after continuous attention is paid to the field. The existing technology usually adopts a one-time sludge inoculation and continuous water inflow operation mode to form a multi-flora coupling biological membrane, and the mode for establishing the biological membrane has long period and poor stability. In addition, because the initial retention rate of the seed sludge is low, the seed sludge is easy to run off along with effluent, and the seed sludge needs to be replenished for many times, the establishment process of the biological membrane is easy to fail.
Disclosure of Invention
The invention aims to provide a preparation method of a coupled flora biomembrane, which aims at solving the problems of long start-up period and poor stability of a multi-flora coupled biological system in the prior art and provides the preparation method of the coupled flora biomembrane to develop a more efficient and more stable multi-flora coupled sewage biological denitrification system.
The preparation method of the coupled flora biofilm provided by the invention comprises the following steps:
carrying out biological modification on the carrier;
forming an initial biofilm of slow-growing flora on the carrier by adopting an intermittent operation method;
reinforcing the formed initial biomembrane of the slow-growing flora by adopting a continuous operation mode;
adding initial biomass of fast growing flora on the biofilm of slow growing flora by adopting an intermittent operation mode to form a coupled flora biofilm;
and a continuous operation mode is adopted to strengthen the coupled flora biofilm.
The preparation method of the coupled flora biofilm provided by the invention has the advantages that:
the preparation method of the coupled flora biomembrane of the invention is based on the growth characteristics of functional microorganisms in the water treatment system, fully exerts the advantages of each functional flora and makes up for the short plate of the functional flora in the biofilm formation process by organically combining the biological modification of the carrier and the intermittent and continuous operation of the system, establishes a high-efficiency and stable sewage biological denitrification system, and solves the problems of slow start and poor stability of the multi-flora coupled sewage biological denitrification system. The method is simple and convenient and is easy to realize.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of the preparation method of coupled flora biofilm according to the present invention.
FIG. 2 is a process flow chart of a coupled flora biofilm preparation method based on the method of the present invention.
In fig. 2, 1 is an integrated biological aerated filter, 2 is a water inlet tank, 3 is a water inlet pump, 4 is a circulating pump, 5 is an aeration pump, 11 is an anoxic zone, 12 is an aerobic zone, and 13 is an aeration disc.
Detailed Description
The preparation method of coupled flora biomembrane provided by the invention has a flow chart as shown in figure 1, and comprises the following steps:
carrying out biological modification on the carrier;
forming an initial biofilm of slow-growing flora on the carrier by adopting an intermittent operation method;
reinforcing the formed initial biomembrane of the slow-growing flora by adopting a continuous operation mode;
adding initial biomass of fast growing flora on the biofilm of slow growing flora by adopting an intermittent operation mode to form a coupled flora biofilm;
and a continuous operation mode is adopted to strengthen the coupled flora biofilm.
In the preparation method of the coupled flora biofilm, the process of biologically modifying the carrier comprises the following steps:
inoculating the excess sludge of the municipal sewage plant into the municipal sewage to form an activation solution, wherein the sludge concentration in the activation solution is 1000 mg/L-2000 mg/L; adding a carrier into an activating solution, wherein the filling ratio is 50-70%; aerating air into the activation solution to ensure that the carrier is fully contacted with the activation solution, and maintaining the dissolved oxygen in the activation solution at 3-6 mg/L; and after the operation is carried out for 2-3 days, taking the carrier out of the activating solution, and finishing the biological modification treatment of the carrier. The carrier can be ceramsite, polyethylene ring or polyurethane sponge.
In the preparation method of the coupled flora biofilm, the initial growth of the slow growth flora is formed on the carrierThe specific process of the material film is as follows: the modified carrier and aerobic sludge (A) are treated2O process aerobic tank sludge) and a matrix liquid are mixed and then added into the integrated biological aerated filter to form a sludge-water mixed solution, the volume concentration of the aerobic sludge in the sludge-water mixed solution is 1000-1500 mg/L, the carrier filling ratio is 60-80%, and the matrix liquid is composed of NH with the volume concentration of 50-100 mg/L4 +-N and essential trace elements required by the microorganism; the mode operation of the integrated biological aerated filter is as follows: stopping water inflow after the integrated biological aerated filter is filled with the mixed liquid, circulating the sludge-water mixed liquid in the integrated biological aerated filter through a circulating pump, wherein the flow rate of the circulating pump is (1/23 filter volume)/h, the temperature is 15-30 ℃, the pH value is 7.2-7.4, the dissolved oxygen in the aerobic zone of the filter is maintained at 2-4 mg/L, and when NH is contained in the substrate liquid4 +Stopping circulation after the N concentration is lower than 10mg/L, standing for 0.5h, discharging supernatant with the water discharge ratio of 2:1, supplementing new matrix liquid to the integrated biological aerated filter, starting circulation operation of the next period, and obtaining an initial biological membrane after the mass volume concentration of sludge entering a circulating pump is lower than 100 mg/L.
In the preparation method of the coupled flora biofilm, a continuous operation mode is adopted, and the specific process of reinforcing the formed initial biofilm of the slow-growing flora comprises the following steps: continuously supplying substrate liquid to the integrated biological aerated filter by a water inlet pump, wherein the flow rate of the water inlet pump is set to (1/24 filter volume)/h; the temperature is 15-30 ℃, the pH value is 7.2-7.4, the dissolved oxygen in the aerobic zone of the filter is maintained at 2-4 mg/L, and the operation is carried out for 3-5 days, so that the initial biomembrane reinforcement is completed.
In the preparation method of the coupled flora biofilm, the initial biomass of the fast growing flora is added on the biofilm of the slow growing flora to form the coupled flora biofilm, and the specific process comprises the following steps: adding anoxic sludge (A) into the integrated biological aerated filter2O process anoxic tank sludge) and a matrix liquid to form a sludge-water mixed liquid, wherein the sludge concentration in the mixed liquid is 1500-2000 mg/L, and the matrix liquid comprises: NH with a volume concentration of 50mg/L4 +-N, NO at a volume concentration of 50mg/L3 -N, chemical oxygen demand (hereinafter referred to as COD) at a volume concentration of 400mg/L, andthe basic trace elements required by the microorganisms are composed, and the operation mode of the integrated biological aerated filter is as follows: stopping water inflow after the integrated biological aerated filter is filled with the matrix liquid, enabling muddy water mixed liquid to be circularly treated in the integrated biological aerated filter through a circulating pump, enabling the flow rate of the circulating pump to be (1/23 filter volume)/h, the temperature to be 15-30 ℃, the pH value to be 7.0-7.2, maintaining the dissolved oxygen in an aerobic area of the integrated biological aerated filter at 1-2mg/L, stopping circulation when the COD concentration in the matrix liquid is lower than 50mg/L, standing for 0.5h, discharging supernate and supplementing new matrix liquid, enabling the drainage ratio of the integrated biological aerated filter to be 2:1, starting the circulation operation of the next period, and obtaining the coupling flora biofilm when the mass volume concentration of sludge entering the circulating pump is lower than 200 mg/L.
In the preparation method of the coupling flora biofilm, the continuous operation mode is adopted, and the process of strengthening the coupling flora biofilm comprises the following steps: continuously supplying substrate liquid to the integrated biological aerated filter through a water inlet pump; the flow rate of the water inlet pump is set to be (1/24 filter chamber volume)/h; the temperature is 15-30 ℃, the pH is 7.0-7.1, and the dissolved oxygen in the aerobic zone of the integrated biological aerated filter is maintained at 1-2 mg/L; run to System to NH4 +-N and NO3 —The removal rate of N can reach more than 50 percent.
The preparation method of the coupled flora biofilm may further comprise: the substrate liquid is changed into actual domestic sewage, wherein NH is contained in the actual domestic sewage4 +The volume concentration of N is 30-50 mg/L, the volume concentration of COD is 200-400 mg/L, the hydraulic retention time (HRT for short) is 24 hours, a circulating pump is started, the reflux ratio of the circulating pump is 1:1, the dissolved oxygen in an aerobic zone of the integrated aeration biological filter is maintained at 1-2mg/L, and water NH is discharged from the filter4 +-N<5mg/L and TN<The HRT is gradually reduced to the integrated biological aerated filter according to the concentration of 15mg/L so as to meet the requirements.
Reference will now be made in detail to embodiments of the method of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment of the invention provides a preparation method of a coupled flora biomembrane, which is based on the growth characteristics of functional microorganisms in a water treatment system, fully exerts the advantages of each functional flora and makes up for the short plate of each functional flora in the biomembrane forming process by organically combining biological modification of a carrier and intermittent and continuous operation of the system, establishes a high-efficiency and stable sewage biological denitrification system, and solves the problems of slow start and poor stability of a multi-flora coupled sewage biological denitrification system. The method is simple and convenient and is easy to realize.
An embodiment of a coupled flora biofilm preparation method provided by the invention is shown in fig. 1 and fig. 2, and the embodiment comprises the following processing steps:
step one, biological modification of a carrier:
the method comprises the steps of adding ceramsite (with the particle size of 4-6mm) into a UASB reactor (1L), adding actual domestic sewage and activated sludge (with the sludge concentration of 1500-2000 mg/L) into a water inlet barrel (24L), pumping a sludge-water mixed solution in the water inlet barrel into the UASB reactor from the bottom by a water inlet pump (with the flow rate of 8L/d), flowing out of the UASB reactor from the top of the UASB and flowing into the water inlet barrel, aerating the UASB (maintaining the dissolved oxygen at 3-4 mg/L), operating for 3 days, taking out the ceramsite from the UASB reactor, and finishing the biological modification treatment on the ceramsite.
FIG. 2 is a diagram of an embodiment of a coupled flora biofilm preparation method based on the method of the present invention, the coupled flora biofilm preparation method, the system includes an integrated biological aerated filter 1, a water inlet tank 2, a water inlet pump 3, a circulating pump 4, and an aeration pump 5; the integrated biological aerated filter 1 mainly comprises an anoxic zone 11, an aerobic zone 12 and an aeration disc 13.
The substrate liquid in the water inlet tank 2 is pumped into the integrated biological aerated filter 1 from the bottom through the water inlet pump 3 and sequentially passes through the anoxic zone 11, the aeration disc 13 and the aerobic zone 12 flow out from the top, the circulating pump pumps the water at the top of the aerobic zone 12 into the bottom of the anoxic zone 11, and the aeration pump 5 pumps the air into the bottom of the aerobic zone 12 through the aeration disc 13 to maintain the aerobic environment of the aerobic zone 12.
Step two, intermittently running to form an initial biofilm of slow-growing flora:
the modified ceramsite and the aerobic sludge (A) are treated2O process aerobic tank sludge) and a matrix liquid are mixed and then added into an integrated biological aerated filter 1(1L), the sludge concentration is 1500-2000 mg/L, the aerobic zone and the anoxic tank are filled with ceramsite, and the matrix liquid comprises the following components (mg/L): NH (NH)4 +-N(100)，CaCl2·2H2O(180)，KH2PO4(10)，MgSO4·7H2O(300)，NaHCO3(500) And KHCO3(500). The concentration of the two trace element solutions was 1.25mL/L to avoid nutrient limitation. The system is operated at room temperature, and the pH value of the matrix liquid is kept between 7.2 and 7.4 by adding sodium hydroxide solution (1M) and hydrochloric acid solution (1M). The aeration rate is maintained at 30-60 ml/min (maintaining DO in an aerobic zone)>2mg/L)。
The system runs in a clearance water inlet mode, the sludge-water mixed liquor is circularly treated in the integrated biological aerated filter through the circulating pump, the flow rate of the circulating pump is (1/23L)/h, and when NH is contained in the substrate liquid4 +And stopping circulation after the N concentration is lower than 10mg/L, precipitating for 0.5h, discharging the supernatant, supplementing new matrix liquid (the water discharge ratio is 2:1), and starting circulation operation of the next period. When the sludge concentration entering the circulation pump is lower than 100mg/L, the process of step S120 is completed.
Step three, continuously operating and reinforcing the slow-growth flora biofilm:
keeping the operation condition of the step S120 unchanged, changing the intermittent water feeding into the continuous water feeding with HRT of 24h, and after the operation for 3-5d, discharging water NH4 +-N<10mg/L。
Step four, intermittently operating the initial biomass of the additional fast growing flora:
inoculating anoxic sludge (A) to the aeration biological filter tank which completes the third step treatment2O process anoxic tank sludge), the inoculated sludge concentration is 1500-2000 mg/L, and the matrix solution comprises the following components (mg/L): NH (NH)4 +-N(50)，NO3 --N(50)，COD(400)，CaCl2·2H2O(180)，KH2PO4(10)，MgSO4·7H2O(300)，NaHCO3(500) And KHCO3(500). The concentration of the two trace element solutions was 1.25mL/L to avoid nutrient limitation. The system is operated at room temperature, and the pH value of the matrix liquid is kept between 7.0 and 7.1 by adding sodium hydroxide solution (1M) and hydrochloric acid solution (1M). The aeration rate is maintained at 20-30 ml/min (1-2 mg/L for DO in the aerobic zone).
The system operates in a clearance water inlet mode, the sludge-water mixed liquor is circularly treated in the integrated biological aerated filter through the circulating pump, the flow rate of the circulating pump is (1/23L)/h, when the COD concentration in the substrate liquid is lower than 50mg/L, the circulation is stopped, the substrate liquid is precipitated for 0.5h, the supernatant liquid is discharged, new substrate liquid is supplemented (the water discharge ratio is 2:1), and the circulating operation of the next period is started. When the sludge concentration entering the circulating pump is lower than 200 mg/L.
Step five, continuously operating the coupling bacterium group biofilm reinforcement:
keeping the operation condition of the step four unchanged, changing the intermittent water feeding into the continuous water feeding with HRT of 24h, and after the operation for 3-5d, discharging NH water4 +-N<10mg/L, NO in effluent3 --N<20mg/L, and finishing the treatment of the fifth step.
Step six, continuously operating to improve the efficiency of the coupled flora biofilm system:
keeping the operation condition of the step five unchanged, and changing the inlet water into actual domestic sewage (NH)4 +-N30-50 mg/L, COD: 200-400 mg/L) and HRT of 24h, starting a circulating pump (reflux ratio of 1:1) to obtain water NH4 +-N<5mg/L, effluent TN<After 15mg/L, HRT is reduced to 16h, and other operations are carried outThe line condition is not changed, and the effluent reaches NH again4 +-N<5mg/L, effluent TN<After 15mg/L, further reducing HRT to 12h, 8h and 6h in sequence, and continuing the treatment until the system reaches the performance meeting the on-site demand.
The main process parameters of each process step are shown in Table 1
Through the steps, a biological film with aerobic autotrophic nitrifying bacteria as a main body is formed in an aerobic area of the integrated biological aerated filter, a biological film with heterotrophic denitrifying bacteria as a main body is established in an anoxic area, and the effluent of the system reaches the first-level A standard and has stable performance.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A preparation method of coupled flora biomembrane is characterized by comprising the following steps:
carrying out biological modification on the carrier;
forming an initial biofilm of slow-growing flora on the carrier by adopting an intermittent operation method;
reinforcing the formed initial biomembrane of the slow-growing flora by adopting a continuous operation mode;
adding initial biomass of fast growing flora on the biofilm of slow growing flora by adopting an intermittent operation mode to form a coupled flora biofilm;
and a continuous operation mode is adopted to strengthen the coupled flora biofilm.
2. The method of claim 1, wherein the step of biologically modifying the carrier comprises:
inoculating the excess sludge of the municipal sewage plant into the municipal sewage to form an activation solution, wherein the sludge concentration in the activation solution is 1000 mg/L-2000 mg/L; adding a carrier into an activating solution, wherein the filling ratio is 50-70%; aerating air into the activation solution to ensure that the carrier is fully contacted with the activation solution, and maintaining the dissolved oxygen in the activation solution at 3-6 mg/L; and after the operation is carried out for 2-3 days, taking the carrier out of the activating solution, and finishing the biological modification treatment of the carrier.
3. The method for preparing coupled flora biofilm according to claim 2, wherein the carrier is ceramsite, polyethylene ring or polyurethane sponge.
4. The method for preparing coupled flora biofilm according to claim 1, wherein the specific process of forming the initial biofilm of slow growing flora on the carrier is as follows: mixing the modified carrier, aerobic sludge and matrix liquid, and adding the mixture into an integrated biological aerated filter to form sludge-water mixed liquid, wherein the volume concentration of the aerobic sludge in the sludge-water mixed liquid is 1000-1500 mg/L, the carrier filling ratio is 60-80%, and the matrix liquid is composed of NH4 +-N and essential trace elements required by microorganisms, NH in the mud-water mixture4 +The mass volume concentration of N is 50-100 mg/L; the mode operation of the integrated biological aerated filter is as follows: stopping water inflow after the integrated biological aerated filter is filled with the mixed liquid, circulating the muddy water mixed liquid in the integrated biological aerated filter through a circulating pump, wherein the flow rate of the circulating pump is (1/23 filter volume)/h, the temperature is 15-30 ℃, the pH value is 7.2-7.4, the dissolved oxygen in the aerobic zone of the filter is maintained at 2-4 mg/L, and when the integrated biological aerated filter is filled with the mixed liquid, the dissolved oxygen in the aerobic zone of the filter is maintained at 2-4 mgNH in the mixed solution4 +Stopping circulation after the N concentration is lower than 10mg/L, standing for 0.5h, discharging supernatant with the water discharge ratio of 2:1, supplementing new matrix liquid to the integrated biological aerated filter, and supplementing NH in mixed liquid after the matrix liquid is supplemented4 +And (4) recovering the mass volume concentration of the N to 50-100 mg/L, starting the circulation operation of the next period, and obtaining an initial biological membrane when the mass volume concentration of the sludge entering the circulation pump is lower than 100 mg/L.
5. The method for preparing coupled flora biofilm according to claim 1, wherein the specific process of reinforcing the formed initial biofilm of slow growing flora in a continuous operation mode comprises the following steps: continuously supplying substrate liquid to the integrated biological aerated filter by a water inlet pump, wherein the flow rate of the water inlet pump is set to (1/24 filter volume)/h; the temperature is 15-30 ℃, the pH value is 7.2-7.4, the dissolved oxygen in the aerobic zone of the filter is maintained at 2-4 mg/L, and the operation is carried out for 3-5 days, so that the initial biomembrane reinforcement is completed.
6. The method for preparing coupled flora biofilm according to claim 1, wherein the initial biomass of fast growing flora is added to the biofilm of slow growing flora, and the specific process for forming coupled flora biofilm is as follows: adding anoxic sludge and matrix liquid into the integrated biological aerated filter to form sludge-water mixed liquid, wherein the sludge concentration of the mixed liquid is 1500-2000 mg/L, and the matrix liquid consists of: NH with a volume concentration of 50mg/L4 +-N, NO at a volume concentration of 50mg/L3 —N, COD with volume concentration of 400mg/L and essential trace elements required by microorganisms, and the operation mode of the integrated biological aerated filter is as follows: stopping water inflow after the integrated biological aerated filter is filled with substrate liquid, circulating muddy water mixed liquor in the integrated biological aerated filter through a circulating pump, wherein the flow rate of the circulating pump is (1/23 filter volume)/h, the temperature is 15-30 ℃, the pH value is 7.0-7.2, dissolved oxygen in an aerobic area of the integrated biological aerated filter is maintained at 1-2mg/L, when the COD concentration in the substrate liquid is lower than 50mg/L, stopping circulation, standing for 0.5h, discharging supernate and supplementing new substrate liquid, and performing integrated biological aerated treatmentAnd (3) starting the circulation operation of the next period when the water discharge ratio of the biological filter is 2:1, and obtaining the coupling flora biofilm after the mass volume concentration of the sludge entering the circulating pump is lower than 200 mg/L.
7. The method for preparing coupled flora biofilm according to claim 1, wherein the continuous operation mode is adopted, and the process for strengthening the coupled flora biofilm comprises the following steps: continuously supplying the substrate liquid according to claim 7 to the integrated biological aerated filter by a water feed pump; the flow rate of the water inlet pump is set to be (1/24 filter chamber volume)/h; the temperature is 15-30 ℃, the PH is 7.0-7.1, and the dissolved oxygen in the aerobic zone of the integrated biological aerated filter is maintained at 1-2 mg/L; run to System to NH4 +-N and NO3 —The removal rate of N can reach more than 50 percent.
8. The method for preparing coupled-flora biofilm according to claim 7, further comprising: the substrate liquid is changed into actual domestic sewage, wherein NH is contained in the actual domestic sewage4 +The volume concentration of N is 30-50 mg/L, the volume concentration of COD is 200-400 mg/L, the hydraulic retention time is 24 hours, a circulating pump is started, the reflux ratio of the circulating pump is 1:1, the dissolved oxygen in an aerobic zone of the integrated biological aerated filter is maintained at 1-2mg/L, and NH (ammonia) is discharged from the filter4 +-N<5mg/L and TN<And the hydraulic retention time is gradually reduced to meet the requirement of the efficiency of the integrated biological aerated filter based on 15 mg/L.
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