A sewage treatment method beneficial to reducing sludge production
By using nitrospiniformis, nitrogenin, and thyroid denitrified compound solution in sewage treatment, the problem of sludge generated in sewage treatment is solved, and efficient sewage treatment and sludge yield are achieved. Reduces secondary environmental pollution and has high economic value.
Patent Information
- Application Number
- CN202410620676.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2044-05-20
AI Technical Summary
In sewage treatment, a large amount of sludge is generated when microorganisms decompose organic matter and nitrogen and phosphorus pollutants, resulting in secondary environmental pollution, and the problem of sludge treatment has not been effectively solved.
Using a compound bacterial solution made of nitrospini, Nitrectin, and T. denitrified, the bacterial solution is added to the pretreated water for stirring and sterilization, and the sludge yield is reduced, and the sludge yield is reduced through Specific bacterial fluid ratio and culture conditions improve the activity and efficiency of bacterial fluid.
It effectively reduces sludge production, improves sewage treatment efficiency and effect, reduces the impact of sludge treatment on the environment, and improves the economic value of the treatment process.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of sewage treatment, and in particular to a sewage treatment method that is beneficial to reducing sludge production. Background Art
[0002] Wastewater treatment is the process of purifying wastewater in order to make it meet the water quality requirements for discharge or reuse. Wastewater mainly includes solid impurities, suspended matter, organic matter, nitrogen and phosphorus pollutants, etc. Solid impurities and suspended matter can usually be separated from solid by physical methods. Pre-treated wastewater is usually degraded by biological means to achieve wastewater purification, so that the pollutant content in the treated clean water reaches the standard level.
[0003] Although inoculating sewage with microorganisms can achieve a very effective sewage treatment effect, in the process of decomposing organic matter and nitrogen and phosphorus pollutants, microorganisms will produce a large amount of excrement due to their physiological activities, that is, a large amount of sludge is formed. Since the treatment of sludge is still a major problem, the production of a large amount of sludge can easily cause secondary pollution of the environment. Therefore, there is still room for improvement. Summary of the invention
[0004] In order to reduce the sludge production during sewage treatment, the present application provides a sewage treatment method that is beneficial to reducing the sludge production
[0005] The present application provides a sewage treatment method that is beneficial to reducing sludge production and adopts the following technical solution:
[0006] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0007] Step 1), adding a flocculant into the sewage, filtering, and obtaining pretreated water;
[0008] Step 2), adding the composite bacterial solution to the pretreated water and stirring for 3-4 days;
[0009] Step 3), sterilize and filter to obtain purified water;
[0010] The culture method of the composite bacterial liquid is as follows:
[0011] Step 01), taking sewage, concentrating it, and obtaining concentrated sewage;
[0012] Step 02), inoculating Nitrospira, Nitrobacter vermifuge and Kingella denitrificans into concentrated sewage, culturing until the OD value is ≥1, and obtaining a composite bacterial solution.
[0013] By adopting the above technical scheme, a composite bacterial liquid formed by the composite culture of Nitrospira, Nitrobacter veseri and Kingella denitrificans is added into the pretreated water, so that the organic matter and nitrogen and phosphorus pollutants in the sewage can be well decomposed. At the same time, since the products of the composite bacteria are mainly gas, the sludge production is greatly reduced, which can effectively reduce the sludge production.
[0014] Through the cooperation of Nitrospira, Nitrobacter veseri and Kingella denitrifying, they can survive better in concentrated sewage, thereby making the cultivation efficiency of the composite bacterial solution higher. The composite bacteria in the composite bacterial solution have high activity and can reproduce rapidly by adding only a small amount to sewage, thereby making the sewage treatment efficiency higher and the treatment effect better.
[0015] Preferably, in step 02), the inoculation mass ratio of Nitrosospira, Nitrobacter veronii and Kingella denitrificans in the concentrated sewage is 3-5:1-3:6-8.
[0016] By adopting the above technical scheme and specifically selecting the inoculation mass ratio of Nitrosospira, Nitrobacter veronii and Denitrifying Kingella in concentrated sewage, the cooperation effect of Nitrosospira, Nitrobacter veronii and Denitrifying Kingella is better, the sewage treatment effect is better and the treatment efficiency is higher.
[0017] Preferably, in the step 02), after inoculating Nitrosospira, Nitrobacter vermifuge and Kingella denitrificans, the culture is maintained at a constant temperature of 36-38° C. and cultured until the OD value is ≥1.
[0018] By adopting the above technical solution and maintaining a constant temperature of 36-38°C, the culture efficiency of the composite bacteria is higher, the OD value ≥ 1 can be reached more quickly, and the economic value is higher.
[0019] Preferably, in the step 01), the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1-2.
[0020] By adopting the above technical scheme, by specifically selecting the mass ratio of sewage before concentration and concentrated sewage after concentration, the concentrated sewage has a higher nutrient content and a higher harmful component, which can better screen the composite bacteria. The various bacteria in the cultured composite bacterial liquid are more adapted to the sewage environment, thereby making the sewage treatment more efficient and having a higher economic value.
[0021] Preferably, in step 2), 1-2 g of the composite bacterial liquid is added to every 1 ton of pretreated water.
[0022] By adopting the above technical solution, it is possible to achieve the effect of efficiently treating sewage while reducing the waste of composite bacterial liquid, thus having higher economic value.
[0023] Preferably, in step 2), the rotation speed during stirring is 10-15 r / min.
[0024] By adopting the above technical solution and continuously stirring at 10-15r / min, the composite bacteria has higher activity, and the sewage treatment effect is better and more efficient.
[0025] Preferably, in step 1), the flocculant is polyacrylamide.
[0026] By adopting the above technical solution, the flocculation effect is better, the solid impurities and suspended matter in the pretreated water can be better removed, and the sewage treatment effect is better.
[0027] Preferably, in step 3), sterilization is performed by introducing ozone.
[0028] By adopting the above technical solution, the complex bacteria can be effectively killed, making the treated purified water safer.
[0029] In summary, this application has the following beneficial effects:
[0030] 1. Since the present application adds a composite bacterial liquid composed of Nitrospira, Nitrobacter veseri and Kingella denitrificans into the pretreated water, the organic matter and nitrogen and phosphorus pollutants in the sewage can be well decomposed. At the same time, since the products of the composite bacteria are mainly gas, the sludge production is greatly reduced, which can effectively reduce the sludge production.
[0031] 2. In the present application, it is preferred to specifically select the inoculation mass ratio of Nitrosospira, Nitrobacter veronii and Denitrifying Kingella in the concentrated sewage, so that the cooperation between Nitrosospira, Nitrobacter veronii and Denitrifying Kingella is better, the sewage treatment effect is better, and the treatment efficiency is higher.
[0032] 3. In the present application, it is preferred to specifically select the mass ratio of the sewage before concentration to the concentrated sewage after concentration, so that the nutrients in the concentrated sewage are higher and the harmful components are also higher, which can better screen the composite bacteria. The various bacteria in the cultured composite bacterial liquid are more adapted to the sewage environment, thereby making the sewage treatment efficiency higher. DETAILED DESCRIPTION
[0033] The present application is further described in detail below with reference to the embodiments.
[0034] Example 1
[0035] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0036] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0037] Step 2), adding the composite bacterial solution to the pretreated water, adding 1g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 10r / min, and stirring for 3 days.
[0038] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0039] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0040] The culture method of the composite bacterial solution in step 2) is as follows:
[0041] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.
[0042] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 3 mg of Nitrospira, 1 mg of Nitrobacter vermiformis, and 6 mg of Kingella denitrificans, keep the temperature at 36°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0043] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0044] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0045] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0046] Example 2
[0047] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0048] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0049] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0050] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0051] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0052] The culture method of the composite bacterial solution in step 2) is as follows:
[0053] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.5.
[0054] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 4 mg of Nitrospira, 2 mg of Nitrobacter vermiformis, and 7 mg of Kingella denitrificans, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0055] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0056] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0057] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0058] Example 3
[0059] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0060] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0061] Step 2), adding the composite bacterial solution to the pretreated water, adding 2 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 15 r / min, and stirring for 4 days.
[0062] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0063] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0064] The culture method of the composite bacterial solution in step 2) is as follows:
[0065] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:2.
[0066] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 5 mg of Nitrospira, 3 mg of Nitrobacter vermiformis, and 8 mg of Kingella denitrificans, keep a constant temperature of 38°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0067] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0068] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0069] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0070] Comparative Example 1
[0071] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0072] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0073] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0074] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0075] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0076] The culture method of the composite bacterial solution in step 2) is as follows:
[0077] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.5.
[0078] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 4 mg of European Nitrosomonas, 2 mg of Nitrobacter vermifuge, and 7 mg of Kingella denitrificans, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0079] Nitrosomonas eutropha was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd. with the accession number: ATCC 25978.
[0080] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0081] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0082] Comparative Example 2
[0083] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0084] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0085] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0086] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0087] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0088] The culture method of the composite bacterial solution in step 2) is as follows:
[0089] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.5.
[0090] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 4 mg of Nitrosospira, 2 mg of C-107 marine Nitrosococcus, and 7 mg of Kingella denitrificans, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0091] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0092] C-107 marine nitrosococcus was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC19707.
[0093] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0094] Comparative Example 3
[0095] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0096] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0097] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0098] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0099] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0100] The culture method of the composite bacterial solution in step 2) is as follows:
[0101] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.5.
[0102] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 4 mg of Nitrospira, 2 mg of Nitrobacter vermiformis, and 7 mg of Denitrifying Halomonas, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0103] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0104] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0105] Denitrifying Halomonas was purchased from Shanghai Collection Biotechnology Center, strain number: SHBCC D12602.
[0106] Comparative Example 4
[0107] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0108] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0109] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0110] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0111] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0112] The culture method of the composite bacterial solution in step 2) is as follows:
[0113] Step 01), take 1L of sewage, and concentrate it by rotary evaporation, the rotary evaporation temperature is 60°C, and the pressure is 0.01MPa, to obtain concentrated sewage, and the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1.5.
[0114] Step 02), take 10 ml of concentrated sewage into a test tube, inoculate 4 mg of European Nitrosomonas, 2 mg of C-107 marine Nitrosococcus, and 7 mg of Denitrifying Halomonas, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0115] Nitrosomonas eutropha was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd. with the accession number: ATCC 25978.
[0116] C-107 marine nitrosococcus was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC19707.
[0117] Denitrifying Halomonas was purchased from Shanghai Collection Biotechnology Center, strain number: SHBCC D12602.
[0118] Comparative Example 5
[0119] A sewage treatment method that is beneficial to reducing sludge production includes the following steps:
[0120] Step 1), add flocculant into sewage, add 1kg flocculant into every ton of water, filter through filter screen to obtain pretreated water.
[0121] Step 2), adding the composite bacterial solution to the pretreated water, adding 1.5 g of the composite bacterial solution to every 1 ton of pretreated water, rotating at a speed of 13 r / min, and stirring for 3.5 days.
[0122] Step 3), the rotation speed is 60r / min, ozone is introduced for sterilization, the ozone introduction amount is 1L / h, ozone is continuously introduced for 1h, and sludge and purified water are obtained respectively after filtering through filter cloth.
[0123] Wherein, the flocculant in step 1) is polyacrylamide, which is purchased from Gongyi Huixiang Water Purification Materials Co., Ltd.
[0124] The culture method of the composite bacterial solution in step 2) is as follows:
[0125] Step 01), take 150 mL of sewage, heat it to 60°C, and cool it naturally to obtain sewage for culture.
[0126] Step 02), take 10 ml of wastewater for culture into a test tube, inoculate 4 mg of Nitrospira, 2 mg of Nitrobacter vermiformis, and 7 mg of Kingella denitrificans, keep the temperature at 37°C, and culture until the OD value = 1 to obtain a composite bacterial solution.
[0127] Nitrosospira was purchased from Beijing Biobio Biotechnology Co., Ltd. with the accession number: ATCC 25196.
[0128] Nitrobacter wesleyi was purchased from Beijing Biobio Biotechnology Co., Ltd., with the accession number: ATCC 25391.
[0129] Denitrifying Kingella was purchased from Beijing Bio-Bowei Biotechnology Co., Ltd., with the accession number: ATCC 33394.
[0130] Experiment 1
[0131] The same batch of domestic wastewater was taken and divided into several portions, each with a mass of 10 kg, and treated respectively by the wastewater treatment methods of the embodiments and comparative examples that are beneficial to reducing sludge production.
[0132] The sludge obtained in step 3) is dried at 110° C. for 30 min and weighed to obtain the weight of the sludge produced after sewage purification.
[0133] The chemical oxygen demand (COD) of the pretreated water obtained in step 1) is tested according to GB18918-2002 "Pollutant Discharge Standard for Urban Sewage Treatment Plants", and then the chemical oxygen demand (COD) of the purified water obtained in step 3) is tested.
[0134] The specific test data of Experiment 1 are shown in Table 1.
[0135] Table 1
[0136]
[0137]
[0138] According to the data comparison in Table 1, the sludge production of each embodiment is lower than that of each comparative example. It can be seen that the compound bacterial liquid of each embodiment can better reduce the sludge production and reduce the secondary pollution to the environment after sewage treatment by compounding Nitrospira, Nitrobacter vermiformis and Kingella denitrificans.
[0139] The chemical oxygen demand (COD) of the purified water of Example 2 is lower than that of Comparative Examples 1-4. It can be seen that the composite bacterial liquid of the embodiment can better cooperate with each other to stimulate the activity of microorganisms through the combination of Nitrosospira, Nitrobacter veronii, and Kingella denitrificans, so that the efficiency of decomposing organic matter and nitrogen and phosphorus pollutants is higher. Under the same treatment time, the effect of sewage treatment can be effectively improved, thereby achieving the effect of shortening the sewage treatment time, and having higher economic value.
[0140] The chemical oxygen demand (COD) of the purified water of each embodiment is lower than that of comparative example 5. It can be seen that the use of concentrated sewage can better screen the microorganisms when culturing the composite bacterial solution, and the activity of the microorganisms in the composite bacterial solution obtained by culture is higher, so that the efficiency of the microorganisms in decomposing organic matter and nitrogen and phosphorus pollutants is higher, the time required for sewage treatment is shorter, the efficiency is higher, and the economic value is higher.
[0141] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
Claims
1. A sewage treatment method that is beneficial to reducing sludge production, characterized in that: The following steps are involved: Step 1), adding flocculant into sewage, filtering, and obtaining pretreated water; Step 2), adding the composite bacterial solution into the pretreated water and stirring for 3-4 days; Step 3), sterilize and filter to obtain purified water; The culture method of the composite bacterial liquid is as follows: Step 01), taking sewage, concentrating it, and obtaining concentrated sewage; Step 02), inoculating Nitrospira, Nitrobacter vermifuge and Kingella denitrificans into the concentrated sewage, and culturing until the OD value is ≥1 to obtain a composite bacterial solution; In the step 02), the inoculation mass ratio of Nitrospira, Nitrobacter vermifuge and Kingella denitrificans in the concentrated sewage is 3-5:1-3:6-8; In the step 01), the mass ratio of the sewage before concentration to the concentrated sewage after concentration is 10:1-2.
2. A sewage treatment method according to claim 1 that is beneficial to reducing sludge production, characterized in that: In the step 02), after inoculating Nitrospira, Nitrobacter vermifuge and Kingella denitrificans, the culture is maintained at a constant temperature of 36-38° C. and cultured until the OD value is ≥1.
3. A sewage treatment method according to claim 1 that is beneficial to reducing sludge production, characterized in that: In the step 2), 1-2 g of the composite bacterial solution is added to every ton of pretreated water.
4. A sewage treatment method according to claim 1 that is beneficial to reducing sludge production, characterized in that: In the step 2), the rotation speed during stirring is 10-15 r / min.
5. A sewage treatment method according to claim 1 that is beneficial to reducing sludge production, characterized in that: In the step 1), the flocculant is polyacrylamide.
6. A sewage treatment method according to claim 1 that is beneficial to reducing sludge production, characterized in that: In the step 3), sterilization is performed by introducing ozone.
Citation Information
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