CN106554076B - Biological treatment method of ammonia-containing wastewater - Google Patents
Biological treatment method of ammonia-containing wastewater Download PDFInfo
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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
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Abstract
The invention discloses a biological treatment method of ammonia-containing wastewater, which comprises the steps of taking activated sludge as a carrier, adding a microorganism growth promoter under the condition that MLSS is 1000-2000 mg/L, and controlling DO to be 2.0-4.0 mg/L; when the ammonia nitrogen removal rate reaches 50% -70%, adding a denitrification microbial agent and a microbial growth promoter, and simultaneously reducing DO to 1.0-2.0 mg/L; when the ammonia nitrogen removal rate reaches more than 80%, reducing DO to 0.1-1.0 mg/L; the microbial growth promoter comprises 40-100 parts by weight of metal salt and 5-30 parts by weight of polyamine substance, wherein the metal salt consists of calcium salt, copper salt, magnesium salt and/or ferrous salt. According to the invention, by adding the denitrogenation microbial agent and the specific microorganism growth promoter into the treatment system and combining the control of the concentration of dissolved oxygen, the high-efficiency removal of ammonia nitrogen and total nitrogen in the same reactor can be realized, and the degradation-resistant organic matters in the wastewater can be efficiently removed, so that the effluent quality is improved.
Description
Technical Field
The invention belongs to the technical field of biological treatment of wastewater, and particularly relates to a biological treatment method of ammonia-containing wastewater.
Background
With the aggravation of nitrogen pollution and the continuous enhancement of public environmental awareness, the social requirements on the environment are increasingly improved, and the limitation on the ammonia nitrogen pollutants in the discharged wastewater is more strict at present. The newly issued discharge standard of pollutants for urban sewage treatment plants in 2002 provides a higher ammonia nitrogen discharge standard (less than or equal to 8mg/L, and less than or equal to 5mg/L if the recycling is carried out). The 'twelve five' project lists ammonia nitrogen as one of total amount control indexes, and simultaneously, partial industries and places can continuously establish stricter total nitrogen control standards. Therefore, solving the problem of ammonia nitrogen pollution becomes an important task of environmental protection science and technology work.
Biological denitrification is one of the more economical and effective methods for solving the nitrogen pollution. The microorganisms responsible for denitrification are mainly autotrophic nitrifying bacteria, regardless of the traditional microorganism attached wastewater treatment structure or a newly developed high-efficiency biomembrane treatment system. Autotrophic bacteria have slow proliferation speed, cannot compete with heterotrophic bacteria in a mixed culture activated sludge system, is difficult to obtain higher biomass, and has low nitrification efficiency, so that an autotrophic microorganism denitrification system has weak impact resistance, incomplete nitrification and low total nitrogen removal rate. Therefore, some new and better denitrifying microorganisms, such as heterotrophic nitrifying bacteria, aerobic denitrifying bacteria, anaerobic ammonium oxidizing bacteria, etc., are discovered in succession.
Compared with autotrophic nitrifying bacteria, although the rate of oxidizing ammonium salt by heterotrophic bacteria per unit biomass is slower than that by autotrophic bacteria, the rate of oxidizing ammonium salt by total heterotrophic bacteria is not slower than that by autotrophic bacteria. Some heterotrophic microorganisms can perform ammonia oxidation to obtain energy required by growth in the absence of an organic carbon source, and can also perform ammonia oxidation in the presence of organic matters without obtaining energy, so that the heterotrophic microorganisms are a secondary metabolic process, and the ammonia oxidation is not limited by the organic matters. Heterotrophic nitrifying bacteria are therefore of great interest as a novel denitrifying microorganism. Researchers at home and abroad carry out extensive research on aspects such as heterotrophic nitrification microorganism screening, functional metabolic pathways, enzymes and genes, but the research is only stopped at the laboratory research stage at present, and examples of really applying heterotrophic nitrifying bacteria to wastewater treatment in practical engineering are rare.
CN101302485A discloses a heterotrophic nitrification microbial agent, a culture method and application thereof, the agent contains stenotrophomonas maltophilia (A)Stenotrophomonas maltophiliastrainDN 1.1) and Pseudomonas putida (Pseudomonas putida strainDN 1.2), the microbial inoculum can effectively remove ammonia nitrogen and total nitrogen in water body, and can also remove ammonia nitrogen and total nitrogen in water bodySo as to remove COD in the organic wastewater simultaneously, and is suitable for treating high-concentration aquaculture wastewater. When the microbial inoculum is used for treating pig farm wastewater with the ammonia nitrogen concentration of 455-600 mg/L, the experiment is carried out for 94-95 h, the removal rate of the ammonia nitrogen in the wastewater reaches 87% -88%, and the ammonia nitrogen content of treated effluent is 59-72 mg/L; after the treatment for 95h, 790mg/L of total nitrogen in the inlet water can be treated to 164mg/L, and the total nitrogen removal rate is 79.2%. CN200910021020.7 discloses a preparation method of a water quality improving microecological preparation for reducing ammonia nitrogen and nitrite nitrogen, wherein the microbial agent relates to an arthrobacter CGMCC No.1282, but the microecological preparation belongs to the technical fields of aquaculture technology and ecological environment protection. CN201210130644.3 discloses a salt-tolerant microbial agent and a preparation method thereof, wherein the microbial agent contains Staphylococcus cohnii FSDN-C, Arthrobacter FDN-1, Flavobacterium aquatile FDN-2, Paracoccus denitrificans DN-3 and Methylobacterium SDN-3. CN201210130645.8 discloses A microbial agent for wastewater treatment and A preparation method thereof, wherein the microbial agent contains Coicoccus palustris FSDN-A, Arthrobacter FDN-1, Flavobacterium aquatile FDN-2, Paracoccus denitrificans DN-3 and Methylobacterium SDN-3. However, the microbial agent according to the present invention is mainly suitable for treating wastewater containing low COD and having good biodegradability, and the effect of treating ammonia-containing wastewater containing hardly degradable organic pollutants is not seen.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a biological treatment method of ammonia-containing wastewater. According to the invention, by adding the denitrogenation microbial agent and the specific microbial growth promoter into the treatment system and combining the control of the concentration of dissolved oxygen, the high-efficiency removal of ammonia nitrogen and total nitrogen in the same reactor can be realized, the nondegradable organic pollutants in the wastewater can be removed, and the effluent quality is improved.
The biological treatment method of the ammonia-containing wastewater comprises the following steps: (1) taking activated sludge of a sewage treatment plant as a microbial carrier, adding a microbial growth promoter under the condition that the sludge concentration (MLSS) is 1000-2000 mg/L, and controlling the dissolved oxygen concentration (DO) to be 2.0-4.0 mg/L, preferably 2.0-3.0 mg/L; (2) when the ammonia nitrogen removal rate reaches 50-70%, adding a denitrification microbial agent and a microbial growth promoter, and simultaneously reducing the dissolved oxygen concentration to 1.0-2.0 mg/L, preferably 1.0-1.5 mg/L; (3) when the ammonia nitrogen removal rate reaches more than 80%, reducing the dissolved oxygen concentration to 0.1-1.0 mg/L, preferably 0.1-0.5 mg/L; the microbial growth promoter comprises 40-100 parts by weight of metal salt and preferably 50-80 parts by weight of polyamine substance, and 5-30 parts by weight of polyamine substance and preferably 10-20 parts by weight of polyamine substance; the metal salt is composed of calcium salt, copper salt, magnesium salt and/or ferrous salt.
The metal salt in the microbial growth promoter can be calcium salt, magnesium salt, copper salt and/or ferrous salt, wherein Ca is2+、Mg2+And Cu2+The molar ratio of (5-15): (5-25): 0.5-5), preferably (8-12): 10-20): 1-4; or salts of calcium, ferrous and copper, where Ca2+、Fe2+And Cu2+The molar ratio of (5-15): (1-8): 0.5-5), preferably (8-12): 2-6): 1-4; or calcium, magnesium, ferrous and copper salts, of which Ca is present2+、Mg2+、Fe2+And Cu2+The molar ratio of (5-15): (5-25): (1-8): 0.5-5), preferably (8-12): 10-20): 2-6): 1-4.
The calcium salt in the microbial growth promoter is CaSO4Or CaCl2Preferably CaSO4(ii) a The magnesium salt is MgSO4Or Mg Cl2Preferably MgSO (MgSO)4(ii) a The ferrous salt is FeSO4Or FeCl2Preferably FeSO4(ii) a The copper salt being CuSO4Or CuCl2Preferably CuSO4. The polyamine substance in the microorganism growth promoter is spermine, spermidine or a mixture of spermine and spermidine.
The microbial growth promoter provided by the invention also can comprise 0.5-15 parts by weight of inorganic hydroxylamine acid, and preferably 2-10 parts by weight. The inorganic acid hydroxylamine is one or more of hydroxylamine hydrochloride, hydroxylamine sulfate or hydroxylamine phosphate, and is preferably hydroxylamine sulfate. The appropriate amount of the inorganic hydroxylamine acid can be used as a matrix of hydroxylamine oxidoreductase to directly participate in the metabolic process of nitrobacteria, shorten the enzymatic reaction process, and simultaneously can be used as an activator of cells to accelerate the growth of the cells.
The adding amount of the microbial growth promoter in the step (1) is 10-40 mg/L, preferably 20-30 mg/L, of the promoter in the sewage treatment system.
The activated sludge of the sewage treatment plant in the step (1) of the invention can come from an oil refining sewage treatment plant, a catalyst sewage treatment plant or an urban sewage plant and the like. And (3) firstly putting activated sludge of a sewage treatment plant into a newly started system into the sewage treatment structure, wherein the dosage of the activated sludge is 1000-2000 mg/L. And adding an accelerant after the activated sludge is subjected to stuffy aeration for a proper time, wherein DO is controlled to be 3.0-5.0 mg/L in the stuffy aeration process, and the stuffy aeration is generally carried out for 24-168 hours. For a running system, an accelerator can be added under the condition of adjusting the sludge concentration in the system to be 1000-2000 mg/L.
The denitrified microbial agent used in the step (2) of the invention is all the existing microbial agents with denitrogenation performance. Preference is given to using a microorganism which contains Arthrobacter (A), (B), (CArthrobacter creatinolyticus) FDN-1 and Flavobacterium aquatile (F: (F;)Flavobacterium mizutaii) One or two of FDN-2, Paracoccus denitrificans(s) ((s))Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) One or two of SDN-3, simultaneously contains Marseconobacter palustris: (C)Kocuria palustris) FSDN-A and Staphylococcus cohnii (II)Staphylococcus cohnii) FSDN-C, the six strains are described in CN102465105, CN102465106, CN102465104, CN102465103, CN103103141 and CN 103103142.
In the step (2), microbial inoculum is added into the system according to 0.001-0.01% of the volume of the wastewater treated per hour every day, microbial growth promoter is added at the same time of adding the microbial inoculum, and the adding amount of the microbial growth promoter is added according to the concentration of the promoter in the sewage treatment system of 5-25 mg/L, preferably 10-20 mg/L.
In the invention, the concentration of ammonia nitrogen in the treated wastewater is 30-400 mg/L, COD is 600-2000 mg/L (Cr method, the same below), BOD is 100-500 mg/L, the temperature is controlled to be 20-40 ℃ and the pH is controlled to be 7.0-9.0 in the wastewater treatment process.
According to the invention, according to the difference between the growth characteristics and the denitrification mechanism of the denitrification microorganisms, the denitrification microbial agent and the specific microorganism growth promoter are added into the treatment system, and the dissolved oxygen concentration of the treatment system in different denitrification stages is regulated, so that the synergistic effect among different microorganisms is enhanced, the adverse effects among different microorganisms are eliminated, the high-efficiency removal of ammonia nitrogen and total nitrogen in the same reactor can be realized, the non-degradable organic pollutants in the wastewater can be removed, and the effluent quality is improved.
According to the invention, the microbial growth promoter is added while the microbial inoculum is added, so that the added microbial inoculum can be rapidly combined with the activated sludge, and the denitrification microorganisms in the activated sludge realize rapid cell proliferation under the combined action of metal salt, polyamine substances and inorganic hydroxylamine acid, can rapidly degrade substrates, and can improve the denitrification rate of the whole system. The different microorganisms and the growth promoter are used in a matched manner, so that the dosage of the microbial inoculum can be obviously reduced, the adaptability of the microbial inoculum to the environment is improved, and the long-term stable operation of the system is maintained.
Detailed Description
The present invention will be described in detail with reference to specific examples. The invention adds microorganism growth promoter and denitrogenation microbial agent with different compositions and proportions when in biological treatment of wastewater, can be directly added into activated sludge of a wastewater treatment plant for use, and can also treat wastewater containing ammonia nitrogen and refractory organic pollutants in a proper biochemical reactor.
Firstly, preparing a metal salt solution according to the proportion and the formula of the nitrobacteria growth promoter shown in the table 1, and adding polyamine substances and inorganic hydroxylamine acid into the metal salt solution before use to prepare the growth promoters I-IV, wherein the concentration of the promoters is 0.5 g/L.
TABLE 1 formulation and proportions of growth promoters
The denitrified microbial inoculum used by the invention can adopt the microbial inoculum A-D prepared in the patent CN201410731313.4 in the example 1 and the microbial inoculum E, F prepared in the example 6.
Example 1
The method can produce waste water containing refractory organic matters and ammonia nitrogen in the production process of a catalyst in an oil refinery, and has the water quality characteristics that: pH9.2, COD 900mg/L, BOD 100mg/L, ammonia nitrogen 137 mg/L. In the long-term operation process of the system, the ammonia nitrogen removal effect is poor, the total nitrogen concentration is up to 152mg/L, the SVI of the activated sludge is more than 200mL/g, and the sedimentation performance is poor.
The sludge concentration of the treatment system is adjusted to 1000mg/L by the treatment according to the method of the invention. Adding a microorganism growth promoter I according to the concentration of the promoter in the treatment system of 25mg/L, and controlling the DO in the system to be about 3.0mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 50%, adding liquid bacterial suspension A into the system according to 0.008% of the volume of the waste water treated per hour every day, adding microorganism growth promoter I according to the concentration of the promoter in the reaction system of 15mg/L, and simultaneously controlling DO to be about 1.5 mg/L. When the ammonia nitrogen removal rate is more than 80 percent, the DO is controlled to be about 0.5mg/L for 15 days. The wastewater treatment temperature is controlled at 30 ℃ and the pH value is controlled at 7.5. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Example 2
The same wastewater as in example 1 was treated, and the sludge concentration of the treatment system was adjusted to 1500 mg/L. Adding a microorganism growth promoter II according to the concentration of the promoter in the treatment system of 20mg/L, and controlling the DO in the system to be about 2.5mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 70 percent, liquid bacterial suspension B is added into the system every day according to 0.005 percent of the volume of the wastewater treated every hour, a microorganism growth promoter II is added according to the concentration of the promoter in the reaction system being 20mg/L, and DO is controlled to be about 1.5 mg/L. When the ammonia nitrogen removal rate is more than 85 percent, the DO is controlled to be about 0.4mg/L for 15 days. The sewage treatment temperature is 25 ℃, and the pH value is 8.5. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Example 3
The water quality of chemical wastewater containing refractory organic pollutants is characterized in that: COD is about 2000mg/L, BOD is about 450mg/L, ammonia nitrogen is about 150mg/L, and pH is 8.7. After the conventional activated sludge treatment process is adopted for treatment, the COD of the effluent is still as high as about 300mg/L, the ammonia nitrogen is still as high as 200mg/L, and the total nitrogen is as high as 250 mg/L.
The sludge concentration of the treatment system is adjusted to 2000mg/L by the treatment according to the method of the invention. Adding a microorganism growth promoter III according to the concentration of the promoter in the treatment system of 25mg/L, and controlling the DO in the system to be about 2.0mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 60 percent, liquid bacterial suspension C is added into the system every day according to 0.008 percent of the volume of the waste water treated every hour, a microorganism growth promoter III is added according to the concentration of the promoter in the reaction system being 20mg/L, and DO is controlled to be about 1.0 mg/L. When the ammonia nitrogen removal rate is more than 90 percent, the DO is controlled to be about 0.3mg/L for 15 days. The sewage treatment temperature is 30 ℃, and the pH value is 8.0. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Example 4
The same wastewater as in example 3 was treated, and the sludge concentration of the treatment system was adjusted to 1500 mg/L. Adding a microorganism growth promoter IV according to the concentration of the promoter in the treatment system of 30mg/L, and controlling the DO in the system to be about 2.5mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 60 percent, liquid bacterial suspension D is added into the system every day according to 0.01 percent of the volume of the wastewater treated every hour, a microorganism growth promoter IV is added according to the concentration of the promoter in the reaction system being 15mg/L, and DO is controlled to be about 1.0 mg/L. When the ammonia nitrogen removal rate is more than 80 percent, the DO is controlled to be about 0.2mg/L for 15 days. The sewage treatment temperature is 25 ℃, and the pH is 7.8. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Example 5
The same wastewater as in example 3 was treated, and the sludge concentration of the treatment system was adjusted to 2000 mg/L. Adding a microorganism growth promoter III according to the concentration of the promoter in the treatment system of 25mg/L, and controlling the DO in the system to be about 2.0mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 60 percent, liquid bacterial suspension E is added into the system every day according to 0.005 percent of the volume of the wastewater treated every hour, a microorganism growth promoter III is added according to the concentration of the promoter in the reaction system being 20mg/L, and DO is controlled to be about 1.0 mg/L. When the ammonia nitrogen removal rate is more than 90 percent, the DO is controlled to be about 0.3mg/L for 15 days. The sewage treatment temperature is 30 ℃, and the pH value is 8.0. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Example 6
The same wastewater as in example 3 was treated, and the sludge concentration of the treatment system was adjusted to 1500 mg/L. Adding a microorganism growth promoter IV according to the concentration of the promoter in the treatment system of 30mg/L, and controlling the DO in the system to be about 2.5mg/L at the initial stage. When the ammonia nitrogen removal rate is more than 60 percent, liquid bacterial suspension F is added into the system every day according to 0.005 percent of the volume of the wastewater treated every hour, a microorganism growth promoter IV is added according to the concentration of the promoter in the reaction system being 15mg/L, and DO is controlled to be about 1.0 mg/L. When the ammonia nitrogen removal rate is more than 80 percent, the DO is controlled to be about 0.2mg/L for 15 days. The sewage treatment temperature is 25 ℃, and the pH is 7.8. SVI in the detection system is less than 200mL/g, ammonia nitrogen, total nitrogen and COD in the effluent after analysis and treatment after one month operation, and the results are shown in Table 2.
Comparative example 1
The processing flow and the processing conditions are the same as those of the example 1, except that: no microbial growth promoter is added. The ammonia nitrogen, total nitrogen and COD of the effluent after the analysis treatment after one month of operation are shown in the table 2.
Comparative example 2
The processing flow and the processing conditions are the same as those of the example 1, except that: and a denitrification microbial agent is not added. The ammonia nitrogen, total nitrogen and COD of the effluent after the analysis treatment after one month of operation are shown in the table 2.
Comparative example 3
The processing flow and the processing conditions are the same as those of the example 1, except that: the dissolved oxygen concentration was controlled to be 2.5mg/L all the time. The ammonia nitrogen, total nitrogen and COD of the effluent after the analysis treatment after one month of operation are shown in the table 2.
Comparative example 4
The processing flow and the processing conditions are the same as those of the example 1, except that: the dissolved oxygen concentration was controlled to be 0.5mg/L all the time. The ammonia nitrogen, total nitrogen and COD of the effluent after the analysis treatment after one month of operation are shown in the table 2.
TABLE 2 treatment Effect of different examples and comparative examples
As can be seen from Table 2, when the method of the present invention is used for treating ammonia-containing wastewater containing refractory organic pollutants, a good treatment effect is obtained, and the dosage of the microbial inoculum is low.
Claims (8)
1. A biological treatment method of ammonia-containing wastewater is characterized by comprising the following steps: taking activated sludge of a sewage treatment plant as a microbial carrier, adding a microbial growth promoter under the condition that the sludge concentration is 1000-2000 mg/L, and controlling the dissolved oxygen concentration to be 2.0-4.0 mg/L at the initial stage; when the ammonia nitrogen removal rate reaches 50-70%, adding a denitrification microbial agent and a microbial growth promoter, and simultaneously reducing the dissolved oxygen concentration to 1.0-2.0 mg/L; when the ammonia nitrogen removal rate reaches more than 80%, reducing the dissolved oxygen concentration to 0.1-1.0 mg/L; the microbial growth promoter comprises 40-100 parts by weight of metal salt and 5-30 parts by weight of polyamine substance; the metal salt consists of calcium salt, copper salt, magnesium salt and/or ferrous salt; the metal salt in the microorganism growth promoter is calcium salt, magnesium salt and copper salt, wherein Ca is2+、Mg2+And Cu2+The molar ratio of (5-15): (5-25): 0.5-5); or salts of calcium, ferrous and copper, where Ca2+、Fe2+And Cu2+The molar ratio of (5-15): (1-8): 0.5-5); or salts of calcium, magnesium, ferrous and copperWherein Ca is2+、Mg2+、Fe2+And Cu2+The molar ratio of (5-15): (5-25): (1-8): 0.5-5); the polyamine substance in the microorganism growth promoter is spermine, spermidine or a mixture of spermine and spermidine; the denitrified microbial agent contains arthrobacterium (A), (B), (C) and (C)Arthrobacter creatinolyticus) FDN-1 and Flavobacterium aquatile (F: (F;)Flavobacterium mizutaii) One or two of FDN-2, Paracoccus denitrificans(s) ((s))Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) One or two of SDN-3, simultaneously contains Marseconobacter palustris: (C)Kocuria palustris) FSDN-A and Staphylococcus cohnii (II)Staphylococcus cohnii）FSDN-C。
2. The method of claim 1, wherein: the calcium salt in the microorganism growth promoter is CaSO4Or CaCl2Magnesium salt is MgSO4Or MgCl2The ferrous salt is FeSO4Or FeCl2The copper salt is CuSO4Or CuCl2。
3. The method of claim 1, wherein: the microbial growth promoter also comprises 0.5-15 parts by weight of inorganic hydroxylamine acid.
4. The method of claim 3, wherein: the inorganic hydroxylamine acid is one or more of hydroxylamine hydrochloride, hydroxylamine sulfate or hydroxylamine phosphate, and the content is 2-10 parts by weight.
5. The method of claim 1, wherein: the adding amount of the microbial growth promoter in the initial stage is 10-40 mg/L according to the concentration of the microbial growth promoter in the sewage treatment system.
6. The method of claim 1, wherein: the activated sludge of the sewage treatment plant comes from a refinery sewage treatment plant, a catalyst sewage treatment plant or an urban sewage treatment plant.
7. The method of claim 1, wherein: when the ammonia nitrogen removal rate reaches 50-70%, adding a denitrification microbial agent into the system according to 0.001-0.01% of the volume of the wastewater treated per hour every day, and simultaneously adding a microbial growth promoter according to the concentration of the microbial growth promoter in the sewage treatment system of 5-25 mg/L.
8. The method of claim 1, wherein: the concentration of ammonia nitrogen in the treated wastewater is 30-400 mg/L, COD is 600-2000 mg/L, and BOD is 100-500 mg/L; the temperature in the wastewater treatment process is controlled to be 20-40 ℃, and the pH is controlled to be 7.0-9.0.
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