A method of wastewater treatment

Abstract

The application belongs to the technical field of wastewater treatment, and discloses a wastewater treatment method, which comprises the following steps: first, butchering wastewater is sequentially introduced into a first filter tank and a second filter tank to filter solid impurities and grease in the butchering wastewater respectively, and first intermediate wastewater is obtained; second, an adjusting agent is added into the first intermediate wastewater to obtain second intermediate wastewater; finally, the second intermediate wastewater is sequentially introduced into an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, and the water quality meets the discharge standard; and in the scheme, the calcium content of the first filter tank and the second filter tank is 80-100 mg / L; through the above treatment method, on the one hand, the content of solid waste, ammonia, nitrogen and phosphorus in the butchering wastewater is reduced, and on the other hand, the chroma and COD content of the wastewater are reduced through the addition of the adjusting agent.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more particularly to a wastewater treatment method. Background Technology

[0002] Slaughterhouse and meat processing wastewater contains large amounts of blood, oil and grease, fur, meat scraps, bone fragments, viscera, undigested food, and feces. Furthermore, it contains numerous microorganisms harmful to human health, such as fecal coliforms and fecal streptococci. Direct discharge of untreated slaughterhouse and meat processing wastewater will seriously harm the surrounding environment and the health of humans and animals. The wastewater contains a large amount of organic matter, which, upon entering water bodies, rapidly consumes dissolved oxygen, causing fish and other aquatic life to die from oxygen deprivation. Under anaerobic conditions, organic matter at the bottom of rivers decomposes, producing foul odors, worsening water quality, polluting the environment, and affecting sanitation. Simultaneously, pathogens in the wastewater can act as vectors for infectious diseases, harming humans and animals.

[0003] Compared to other organic wastewater, slaughterhouse and meat processing wastewater has a particularly high ammonia nitrogen concentration, classifying it as high-ammonia nitrogen wastewater. Statistics show that approximately 2 billion cubic meters of wastewater are discharged annually from pig slaughterhouses in my country. 3 This accounts for approximately 6% of the total industrial wastewater discharge nationwide. The proteins, urea, uric acid, fats, and carbohydrates in slaughterhouse and meat processing wastewater are mostly in solid or dissolved states. These substances can be further converted into high concentrations of ammonia nitrogen through ammonification, reaching an average concentration of 50-60 mg / L, causing very serious environmental pollution. High ammonia nitrogen wastewater can cause eutrophication of water bodies, deteriorating their sensory properties. The specific hazards of slaughterhouse and meat processing wastewater include the following:

[0004] (1) It consumes dissolved oxygen in the water and accelerates the release of nutrients in the bottom sediment;

[0005] (2) It affects the water source and increases water supply costs;

[0006] (3) Ammonia nitrogen is toxic to humans and organisms;

[0007] (4) Eutrophication of water bodies occurs;

[0008] (5) Deterioration of the sensory properties of the water body;

[0009] (6) Carcinogenic and teratogenic effects;

[0010] (7) It disrupted the ecological balance of the lake;

[0011] (8) It affects the development of fisheries.

[0012] Therefore, the treatment of slaughterhouse wastewater and the continuous updating of slaughterhouse wastewater treatment technologies are urgently needed.

[0013] In his master's thesis, "Research and Application of Wastewater Treatment Technology for Slaughtering and Meat Processing at Shenyang Shuanghui," Cui Chen of Shenyang Jianzhu University predicted and analyzed the wastewater quality and discussed existing SBR wastewater treatment processes and A... 2 The / O process was introduced and compared, and the SBR process and A were also discussed. 2 A technical and economic analysis of the / O process was conducted, and the results showed that the operating cost of the SBR process was 2.21 yuan / ton of water, while the cost of the A process was lower. 2 The operating cost of the / O process is 1.88 yuan / ton of water. After comparison, the final decision was made to choose hydrolysis acidification + A. 2 / O process as a biological treatment process;

[0014] Furthermore, the verification test results of this scheme show that the biological treatment unit for wastewater from Shenyang Shuanghui slaughtering and meat processing uses A 2 The / O process is feasible, achieving COD and ammonia nitrogen removal rates of over 90% and TN removal rate of 73% after treatment, meeting the design effluent quality requirements. Furthermore, the hydraulic retention time, mixed liquor recirculation ratio, sludge recirculation ratio, and air-to-water ratio significantly influence A... 2 The treatment effect of the / O process is greatly affected. The best treatment effect is achieved when the hydraulic retention time is 16h, the sludge return ratio is 80%, the air-to-water ratio is 7:1, and the mixed liquor return ratio is 200%. However, it should be noted that this scheme has not conducted much testing and analysis on the selection of microbial species in the anaerobic and aerobic tanks.

[0015] Chinese patent application 202211481339.9 discloses a method for treating slaughterhouse wastewater by biological contact oxidation, which includes: (1) filtering the slaughterhouse wastewater and then precipitating it, and then injecting the precipitated wastewater into an anaerobic tank; (2) adding anaerobic bacteria to the anaerobic tank, and then injecting the anaerobic wastewater into an aerobic tank after anaerobic treatment; and (3) aerating the wastewater in the aerobic tank to obtain the treated slaughterhouse wastewater.

[0016] This solution features high biological activity, excellent treatment effect on slaughterhouse wastewater, high load capacity, and strong shock resistance, effectively improving wastewater treatment efficiency. Furthermore, as seen in paragraph 28 of this solution, the anaerobic bacteria agent is selected from Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus, and Lactobacillus. The examples also demonstrate that, after using the combination of these bacteria, Examples 1-3 exhibited good inhibition of COD, ammonia nitrogen, total phosphorus, and total nitrogen. However, it is important to note that in the treatment of slaughterhouse wastewater, ammonia, nitrogen, and phosphorus are present in extremely high concentrations, making their removal crucial. Additionally, slaughterhouse wastewater contains a large amount of blood, thus optimizing its color is also essential.

[0017] Chinese patent application 201410344084.0 discloses a flocculant for wastewater treatment and its preparation method. The flocculant includes calcium sulfate, aluminum salt, sodium carbonate, polyacrylamide, sodium thiosulfate, chitosan, chitosan quaternary ammonium salt, diatomaceous earth, cement, and pH adjuster. The flocculant prepared by this method has good flocculation effect, fast flocculation speed, low chemical consumption, and wide applicability when used to treat high-concentration organic wastewater. It can effectively reduce the COD, color, turbidity, and total phosphorus content of wastewater, and can also remove algae. It is especially effective for treating wastewater with high COD, high turbidity, and high color.

[0018] Furthermore, as can be seen from the embodiments of this scheme, the flocculants prepared in embodiments 1-4 of this scheme have good flocculation capabilities in terms of COD, color, and turbidity in wastewater.

[0019] The problem this solution aims to solve is: how to develop a method suitable for treating slaughterhouse wastewater that can not only effectively reduce the ammonia nitrogen content in slaughterhouse wastewater, but also effectively reduce the color of slaughterhouse wastewater. Summary of the Invention

[0020] The purpose of this invention is to provide a method for treating slaughterhouse wastewater, which involves A 2 The / O treatment process effectively reduces the ammonia nitrogen content in slaughterhouse wastewater. Furthermore, by increasing the calcium ion content in the primary and secondary filtration tanks, it alters the charge properties of proteins in the blood within the slaughterhouse wastewater. Additionally, after the addition of flocculants, it can combine with the flocculants to form complexes or gels, thereby further reducing the blood content in the slaughterhouse wastewater.

[0021] To achieve the above objectives, this application discloses a method for treating slaughterhouse wastewater, comprising the following steps:

[0022] Step 1: Pass the slaughterhouse wastewater through the primary filtration tank and the secondary filtration tank in sequence to filter out solid impurities and grease from the slaughterhouse wastewater, and obtain the primary intermediate wastewater;

[0023] It should be noted that this application does not limit the specific structure of the primary and secondary filtration tanks. In actual use, the operator uses a filter screen to filter solid impurities and filters grease by the density of water and grease.

[0024] Step 2: Add a regulator to the primary intermediate wastewater obtained in Step 1 to obtain secondary intermediate wastewater; the regulator includes, by mass parts: 20-25 parts activated carbon, 15-20 parts polyaluminum chloride, 15-20 parts polyacrylamide, 15-20 parts ferrous sulfate, and 15-20 parts calcium oxide.

[0025] Step 3: Pass the secondary intermediate wastewater obtained in Step 2 into the anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, and then discharge it.

[0026] The calcium ion content in the primary and secondary filtration tanks is 80–100 mg / L.

[0027] Preferably, the anaerobic tank contains anaerobic bacteria, which are selected from at least one of Clostridium bengalicum, Staphylococcus pasteurellii, denitrifying bacteria, Bacillus clausti, and Bacillus serrata.

[0028] Preferably, the aerobic tank contains aerobic bacteria, which are nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria, and the mass ratio of nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria is 2-4:1-3:2-4.

[0029] Preferably, in step 2, the mass ratio of the regulator to the primary intermediate wastewater is 1:350-500.

[0030] Preferably, the anaerobic bacteria are Clostridium bengalicylate, Staphylococcus pasteurellii, and denitrifying bacteria.

[0031] Preferably, the anaerobic tank is provided with a packing zone, which includes, by weight, 20-25 parts ceramic particles, 10-15 parts nickel foam, and 60-65 parts activated sludge.

[0032] It should be noted that the activated sludge mentioned above is activated sludge containing anaerobic and aerobic bacteria that has settled in the sedimentation tank.

[0033] Preferably, the nickel foam is nickel foam supported on carbon nanotubes, and the method for preparing the nickel foam supported on carbon nanotubes includes the following steps:

[0034] Step A1: Cut the nickel foam into 2cm×2cm×2mm blocks;

[0035] Step A2: Disperse carbon nanotubes in pure water to obtain a carbon nanotube dispersion;

[0036] Step A3: Immerse the blocky nickel foam in the carbon nanotube dispersion, then add ascorbic acid to the carbon nanotube dispersion, heat in a water bath, and dry to obtain nickel foam loaded with carbon nanotubes.

[0037] The mass ratio of nickel foam, carbon nanotubes, and ascorbic acid is 1:0.15 to 0.3:0.1.

[0038] Preferably, the concentration of carbon nanotubes in the carbon nanotube dispersion is 10–15 mg / L.

[0039] Preferably, the water bath heating temperature is 70-80°C and the heating time is 6-8 hours.

[0040] The beneficial effects of this application are: this application passes A 2 The / O treatment process effectively reduces the ammonia nitrogen content in slaughterhouse wastewater. Furthermore, by increasing the calcium ion content in the primary and secondary filtration tanks, it alters the charge properties of proteins in the blood within the slaughterhouse wastewater. Additionally, after the addition of flocculants, it can combine with the flocculants to form complexes or gels, thereby further reducing the blood content in the slaughterhouse wastewater. Detailed Implementation

[0041] The present invention will now be clearly and completely described in conjunction with embodiments thereof. It should be noted that, unless specific conditions are specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0042] Example 1

[0043] I. Preparation of nickel foam supported on carbon nanotubes:

[0044] Step A1: Cut the nickel foam into 2cm×2cm×2mm blocks;

[0045] Step A2: Disperse carbon nanotubes in pure water to obtain a carbon nanotube dispersion, wherein the concentration of carbon nanotubes in the dispersion is 12 mg / L.

[0046] Step A3: Immerse the bulk nickel foam in the carbon nanotube dispersion at a mass ratio of nickel foam, carbon nanotubes and ascorbic acid of 1:0.2:0.1. Then add ascorbic acid to the carbon nanotube dispersion. Then heat in a water bath at 80°C for 6 hours and then dry at 80°C for 3 hours to obtain nickel foam loaded with carbon nanotubes.

[0047] II. Wastewater Treatment:

[0048] Step 1: Pass the slaughter wastewater into the primary filter tank and the secondary filter tank in sequence, and add calcium oxide into the primary filter tank and the secondary filter tank at the same time to make the calcium ion content in the primary filter tank and the secondary filter tank reach 80mg / L.

[0049] Solid impurities and grease in slaughterhouse wastewater are filtered through a primary filtration tank and a secondary filtration tank, respectively, to obtain primary intermediate wastewater;

[0050] Step 2: Add the regulator to the primary intermediate wastewater obtained in Step 1 at a mass ratio of 1:350 to obtain secondary intermediate wastewater; the regulator includes, by mass parts: 20 parts activated carbon, 20 parts polyaluminum chloride, 20 parts polyacrylamide, 20 parts ferrous sulfate, and 20 parts calcium oxide.

[0051] Step 3: The secondary intermediate wastewater obtained in Step 2 is sequentially fed into the anaerobic tank, anoxic tank, aerobic tank, and sedimentation tank, and discharged when the water quality meets the standards.

[0052] The anaerobic bacteria in the anaerobic tank are denitrifying bacteria and Bacillus clausti.

[0053] The aerobic bacteria in the aerobic tank are nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria, and the mass ratio of nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria is 2:1:2.

[0054] The packing zone comprises, by weight, 20 parts ceramic particles, 15 parts nickel foam loaded with carbon nanotubes, and 65 parts activated sludge.

[0055] Example 2

[0056] Step 1: Pass the slaughter wastewater into the primary filter tank and the secondary filter tank in sequence, and add calcium oxide into the primary filter tank and the secondary filter tank at the same time to make the calcium ion content in the primary filter tank and the secondary filter tank 90mg / L.

[0057] Solid impurities and grease in slaughterhouse wastewater are filtered through a primary filtration tank and a secondary filtration tank, respectively, to obtain primary intermediate wastewater;

[0058] Step 2: Add the regulator to the primary intermediate wastewater obtained in Step 1 at a mass ratio of 1:420 to obtain secondary intermediate wastewater; the regulator includes, by mass parts: 25 parts activated carbon, 15 parts polyaluminum chloride, 20 parts polyacrylamide, 20 parts ferrous sulfate, and 20 parts calcium oxide.

[0059] Step 3: The secondary intermediate wastewater obtained in Step 2 is sequentially fed into the anaerobic tank, anoxic tank, aerobic tank, and sedimentation tank, and discharged when the water quality meets the standards.

[0060] The anaerobic bacteria in the anaerobic tank are Clostridium bengalifolium and denitrifying bacteria;

[0061] The aerobic bacteria in the aerobic tank are nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria, and the mass ratio of nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria is 3:2:3.

[0062] The packing zone comprises, by mass, 24 parts ceramic particles, 13 parts nickel foam loaded with carbon nanotubes, and 63 parts activated sludge.

[0063] Example 3

[0064] Step 1: Pass the slaughter wastewater into the primary filter tank and the secondary filter tank in sequence, and add calcium oxide into the primary filter tank and the secondary filter tank at the same time to make the calcium ion content in the primary filter tank and the secondary filter tank 100mg / L.

[0065] Solid impurities and grease in slaughterhouse wastewater are filtered through a primary filtration tank and a secondary filtration tank, respectively, to obtain primary intermediate wastewater;

[0066] Step 2: Add the regulator to the primary intermediate wastewater obtained in Step 1 at a mass ratio of 1:500 to obtain secondary intermediate wastewater; the regulator includes, by mass parts: 25 parts activated carbon, 20 parts polyaluminum chloride, 15 parts polyacrylamide, 15 parts ferrous sulfate, and 15 parts calcium oxide.

[0067] Step 3: The secondary intermediate wastewater obtained in Step 2 is sequentially fed into the anaerobic tank, anoxic tank, aerobic tank, and sedimentation tank, and discharged when the water quality meets the standards.

[0068] The anaerobic bacteria in the anaerobic tank are Clostridium benziae, denitrifying bacteria, and Bacillus clausti.

[0069] The aerobic bacteria in the aerobic tank are nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria, and the mass ratio of nitrifying bacteria, sulfate-reducing bacteria, and polyphosphate bacteria is 4:3:4.

[0070] The packing zone comprises, by weight, 25 parts ceramic particles, 15 parts nickel foam loaded with carbon nanotubes, and 60 parts activated sludge.

[0071] Example 4

[0072] The method is basically the same as in Example 1, except that the anaerobic bacteria in the anaerobic tank are Clostridium betaine, denitrifying bacteria, and Staphylococcus pasteurellii; and the mass ratio of Clostridium betaine, denitrifying bacteria, and Staphylococcus pasteurellii is 1:1:1.

[0073] Example 5

[0074] The method is basically the same as in Example 1, except that the anaerobic bacteria in the anaerobic tank are Clostridium betaine, denitrifying bacteria, and Serratia marcescens; and the mass ratio of Clostridium betaine, denitrifying bacteria, and Serratia marcescens is 1:1:1.

[0075] Comparative Example 1

[0076] It is basically the same as Example 1, except that the calcium ion content in the primary and secondary filtration tanks is 20 mg / L.

[0077] Comparative Example 2

[0078] It is basically the same as Example 1, except that the calcium ion content in the primary and secondary filtration tanks is 300 mg / L.

[0079] Comparative Example 3

[0080] The method is basically the same as in Example 1, except that the anaerobic bacteria in the anaerobic tank are Bacillus coagulans and Bacillus subtilis, and the mass ratio of Bacillus coagulans to Bacillus subtilis is 1:1.

[0081] Comparative Example 4

[0082] It is basically the same as Example 1, except that the foamed nickel is foamed nickel without loading any substance.

[0083] Comparative Example 5

[0084] It is basically the same as Example 1, except that the foamed nickel is foamed nickel supported on activated carbon.

[0085] Comparative Examples 6-9

[0086] The method is basically the same as in Example 1, except that the formulation of the regulator is shown in Table 1:

[0087] Table 1: Formulation of Regulators for Comparative Examples 6-9

[0088]

[0089] Comparative Examples 10-13

[0090] The method is basically the same as in Example 1, except that the formulation of the regulator is shown in Table 2:

[0091] Table 2: Formulation of Regulators for Comparative Examples 10-13

[0092]

[0093] Performance testing:

[0094] The same batch of slaughterhouse wastewater was treated using the examples and comparative examples, and the ammonia content, nitrogen content, phosphorus content, color, and COD value before and after treatment were recorded for each example and comparative example. The ammonia removal rate, nitrogen removal rate, phosphorus removal rate, color removal rate, and COD removal rate were calculated. The results are shown in Table 3.

[0095] Table 3: Wastewater Treatment Results of Each Example and Comparative Example

[0096]

[0097]

[0098] Results analysis:

[0099] 1. As can be seen from Examples 1-3, when the calcium ion content in the primary and secondary filtration tanks reaches 90 mg / L, the removal rates of ammonia, nitrogen, and phosphorus after wastewater treatment are significantly higher than those in other examples. At the same time, the treatment of color and COD also has certain advantages compared with Examples 1 and 3, indicating that the system has a stronger ability to treat pollutants at this calcium ion concentration.

[0100] 2. As can be seen from Examples 1 and 4, when Clostridium bengalicum, denitrifying bacteria and Staphylococcus pasteurellium are used in combination, Example 4 shows a certain degree of improvement in the treatment capacity of ammonia, nitrogen, phosphorus, color and COD. We speculate that the reason for this phenomenon is that the increased abundance of bacterial species enhances their decomposition capacity when dealing with different pollutants.

[0101] 3. As can be seen from Examples 1 and 5, when Clostridium bengalicum, denitrifying bacteria, and Serratia marcescens are selected and used in combination, Example 5 shows a significant improvement in the treatment capacity for ammonia, nitrogen, phosphorus, color, and COD. We speculate that the reason for this phenomenon is that Clostridium bengalicum, denitrifying bacteria, and Serratia marcescens in this example are more suitable for decomposing pollutants in slaughterhouse wastewater.

[0102] 4. As can be seen from Example 1 and Comparative Example 1, when the concentration of calcium ions in the primary and secondary filtration tanks is reduced, the color removal rate decreases significantly, and the removal rates of ammonia, nitrogen, and phosphorus also decrease to varying degrees. We speculate that high concentrations of calcium ions can alter the charge properties of proteins in the blood of slaughterhouse wastewater, and can combine with flocculants to form complexes or gels after subsequent flocculant addition. When the calcium ion concentration is reduced, the flocculant's rate and ability to flocculate blood components decrease to a certain extent, thus leading to an increase in residual blood components in the blood water, which in turn leads to a significant decrease in the color removal rate.

[0103] 5. As can be seen from Example 1 and Comparative Example 2, when the calcium ion content is further increased, the ammonia, nitrogen, phosphorus, color and COD values ​​do not decrease significantly compared with Example 1, and the effect is almost the same as that of Example 3.

[0104] 6. As can be seen from Example 1 and Comparative Example 3, when Bacillus coagulans and Bacillus subtilis not disclosed in this application are used to treat wastewater, the removal rates of ammonia, nitrogen, phosphorus, color, and COD are significantly reduced. We believe that the above-mentioned Bacillus coagulans and Bacillus subtilis may perform well in the field of wastewater treatment, but the above-mentioned strains are not suitable for use in the treatment of slaughterhouse wastewater.

[0105] 7. As can be seen from Examples 1 and Comparative Examples 4 and 5, when the nickel foam is nickel foam without any loading or nickel foam loaded with activated carbon, its removal rates of ammonia, nitrogen, phosphorus, color and COD all decrease to varying degrees. We believe that only when nickel foam with high specific surface area and three-dimensional porous structure is used in combination with carbon nanotubes with the same high specific surface area can its adsorption capacity be fully utilized.

[0106] 8. As can be seen from Example 1 and Comparative Examples 6-9, when any component is missing from the regulator, the removal rates of ammonia, nitrogen, phosphorus, color, and COD in the wastewater are significantly reduced, indicating that activated carbon, polyaluminum chloride, polyacrylamide, ferrous sulfate, and calcium oxide in the regulator are indispensable in this application.

[0107] 9. As can be seen from the comparison examples 1 and 10-13, when any component in the regulator is replaced, the removal rates of ammonia, nitrogen, phosphorus, color, and COD in the wastewater are significantly reduced, indicating that activated carbon, polyaluminum chloride, polyacrylamide, ferrous sulfate, and calcium oxide in the regulator are irreplaceable in this application.

Claims

1. A method of treating wastewater, characterized by, The method comprises the following steps: step 1, slaughter wastewater is sequentially introduced into a first filter tank and a second filter tank to filter solid impurities and grease in the slaughter wastewater, and first intermediate wastewater is obtained; step 2, an adjusting agent is added into the first intermediate wastewater to obtain second intermediate wastewater; the adjusting agent comprises, in parts by mass, 20-25 parts of activated carbon, 15-20 parts of polyaluminum chloride, 15-20 parts of polyacrylamide, 15-20 parts of ferrous sulfate and 15-20 parts of calcium oxide; and step 3, the second intermediate wastewater is sequentially introduced into an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank and a discharge tank; the content of calcium ions in the first filter tank and the second filter tank is 80-100 mg / L. The anaerobic tank is provided with a filler area, and the filler area comprises, in parts by mass, 20-25 parts of ceramic particles, 10-15 parts of foamed nickel and 60-65 parts of activated sludge. The foamed nickel loaded with carbon nanotubes is prepared by the following steps: step A1, the foamed nickel is cut into blocks with a size of 2 cm*2 cm*2 mm; step A2, carbon nanotubes are dispersed in pure water to obtain a carbon nanotube dispersion; and step A3, the blocky foamed nickel is immersed in the carbon nanotube dispersion, ascorbic acid is then added to the carbon nanotube dispersion, water bath heating is performed, and drying is performed to obtain the foamed nickel loaded with carbon nanotubes; wherein the mass ratio of the foamed nickel, the carbon nanotubes and the ascorbic acid is 1:0.15-0.3:0.

1.

2. The wastewater treatment method according to claim 1, characterized by, The anaerobic tank contains anaerobic bacteria, and the anaerobic bacteria are at least one of Clostridium beijerinckii, Staphylococcus pasteuri, denitrifying bacteria, Clostridium kluyveri and Serratia marcescens.

3. The wastewater treatment method according to claim 1, characterized by, The aerobic tank contains aerobic bacteria, and the aerobic bacteria are nitrifying bacteria, sulfate-reducing bacteria and phosphorus-accumulating bacteria, and the mass ratio of the nitrifying bacteria, the sulfate-reducing bacteria and the phosphorus-accumulating bacteria is 2-4:1-3:2-4.

4. The wastewater treatment method according to claim 1, characterized by, In step 2, the mass ratio of the adjusting agent to the first intermediate wastewater is 1:350-500.

5. The wastewater treatment method according to claim 2, characterized by, The anaerobic bacteria are Clostridium beijerinckii, Staphylococcus pasteuri and denitrifying bacteria.

6. The wastewater treatment method according to claim 1, characterized by, The concentration of the carbon nanotubes in the carbon nanotube dispersion is 10-15 mg / L.

7. The wastewater treatment method according to claim 1, characterized by, The heating temperature of the water bath heating is 70-80 DEG C, and the heating time is 6-8 hours.

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