CN111439892A - Domestic sewage treatment device and method with integrated membrane bioreactor - Google Patents
Domestic sewage treatment device and method with integrated membrane bioreactor Download PDFInfo
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- CN111439892A CN111439892A CN202010328671.6A CN202010328671A CN111439892A CN 111439892 A CN111439892 A CN 111439892A CN 202010328671 A CN202010328671 A CN 202010328671A CN 111439892 A CN111439892 A CN 111439892A
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- 239000012528 membrane Substances 0.000 title claims abstract description 68
- 239000010865 sewage Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000020477 pH reduction Effects 0.000 claims abstract description 32
- 239000010802 sludge Substances 0.000 claims abstract description 31
- 230000007062 hydrolysis Effects 0.000 claims abstract description 27
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 24
- 238000005276 aerator Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 239000004155 Chlorine dioxide Substances 0.000 claims description 12
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 8
- 241000894006 Bacteria Species 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 244000005700 microbiome Species 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000000645 desinfectant Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 241000606125 Bacteroides Species 0.000 claims description 3
- 241000193403 Clostridium Species 0.000 claims description 3
- 241000605122 Nitrosomonas Species 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims description 2
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 238000000855 fermentation Methods 0.000 claims description 2
- 230000004151 fermentation Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000010992 reflux Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 239000000306 component Substances 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000003301 hydrolyzing effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/02—Aerobic processes
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a domestic sewage treatment device and method of an integrated membrane bioreactor. The device comprises a grating tank, an adjusting tank, a hydrolysis acidification tank, an integrated membrane biological reaction tank, a disinfection tank and a sludge tank. Compared with other processes, the invention has the advantages that the organic matters (COD and BOD) of the process5) The removal capability and the nitrogen and phosphorus removal capability are strong, and the process is simple and easy to manage.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a domestic sewage treatment device and method of an integrated membrane bioreactor.
Background
According to statistics, the annual discharge amount of domestic sewage in rural areas of China is about 80 hundred million tons, the rural sewage treatment rate is only 6 percent, and 96 percent of villages do not have sewage discharge pipelines and sewage treatment systems. Rural domestic sewage has the characteristics of high dispersibility, difficulty in uniform collection, small water quantity, large water quantity fluctuation and the like, and the environment pollution is brought to the nature by directly discharging wastewater. The rural domestic sewage treatment technology in China mostly adopts the traditional physicochemical, artificial wetland and biological treatment technologies, and the adoption of the technologies faces the following problems: the process is complex and the management is difficult; the quality of the effluent is unstable.
Disclosure of Invention
The invention aims to provide an integrated membrane bioreactor biological sewage assistant device and method with simple process and stable effluent quality aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides an integrated membrane bioreactor domestic sewage treatment device, which comprises a grating tank, a regulating tank, a hydrolysis acidification tank, an integrated membrane bioreactor, a disinfection tank and a sludge tank, wherein the grating tank is used for removing large granular substances in sewage; the inlet of the adjusting tank is communicated with the grating tank and is used for adjusting the water quantity and the water quality; the inlet of the hydrolysis acidification tank is communicated with the outlet of the regulating tank and is used for hydrolysis acidification; the inlet of the integrated membrane biological reaction tank is communicated with the hydrolysis acidification tank and is used for removing organic matters; the inlet of the disinfection tank is communicated with the water outlet of the integrated membrane biological reaction tank and is used for disinfecting the outlet water; the sludge tank inlet is communicated with the sludge outlet of the integrated membrane biological reaction tank and is used for discharging sludge.
Preferably, two lifting pumps, two sets of liquid level meters and one set of flow meter are arranged in the regulating reservoir.
Preferably, a microporous aerator, a perforated pipe and a membrane assembly are arranged in the integrated membrane biological reaction tank, the membrane assembly is connected with a self-priming pump and a back-flushing pump, and the microporous aerator and the perforated pipe are connected with an aerator.
Preferably, the sludge outlet of the integrated membrane biological reaction tank is also communicated with the hydrolysis acidification tank.
Preferably, the disinfectant inlet of the disinfection tank is connected with a chlorine dioxide generator.
On the other hand, the invention also provides a domestic sewage treatment method of the integrated membrane bioreactor, which comprises the following steps of 1) introducing sewage into a grid pool, then introducing the sewage into an adjusting pool, adjusting the water quantity and the water quality, controlling the flow of the sewage entering the adjusting pool through a flowmeter, 2) lifting the sewage in the step 1) to a hydrolysis acidification pool, adding fermentation bacteria to perform hydrolysis acidification on the water quality, wherein the hydraulic retention time is 4h, 3) introducing the sewage obtained in the step 2) into an integrated membrane bioreactor, aerating and stirring the sewage, fully mixing the sewage with suspended and attached microorganisms, degrading organic matters in the sewage by aerobic microorganisms in the pool, enabling the water quality of effluent to reach the standard through a membrane module, returning part of sludge generated in the process to the hydrolysis acidification pool, and discharging the other part of sludge into a sludge pool for treatment, and 4) mixing the liquid in the step 3) with chlorine dioxide, then introducing into a disinfection pool, and discharging the disinfected feces coliform with the number of less than 1000/L.
Preferably, the fermenting bacteria in step 2) include one or more of clostridium, bacteroides, yeast, mold and nitrosomonas.
Preferably, the dissolved oxygen in the integrated membrane biological reaction tank in the step 4) is 2-2.5 mg/L, and the aeration intensity is 60-80 m3/(m2·h)。
Preferably, the membrane flux of the membrane module in the integrated membrane biological reaction tank in the step 4) is 20L (m)2/h)。
Compared with the prior art, the invention has the advantages that:
the device comprises a grating tank, an adjusting tank, a hydrolysis acidification tank, an integrated membrane biological reaction tank, a disinfection tank and a sludge tank, and when the device is used, sewage can be treated by sequentially passing through the grating tank, the adjusting tank, the hydrolysis acidification tank, the integrated membrane biological reaction tank and the disinfection tank. Compared with the traditional physical and chemical, artificial wetland and biological treatment technologies, the method has simple process and easy management. The integrated membrane bioreactor replaces gravity precipitation in the traditional process, solves the technical problem that the treatment result is determined by particle settleability, can well realize solid-liquid separation, and ensures the quality of effluent water.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.
Fig. 1 is a block diagram of the present invention.
Reference numbers in the figures: 1. a grid tank; 2. a regulating tank; 3. a hydrolysis acidification pool; 4. an integrated membrane biological reaction tank; 5. a disinfection tank; 6. a sludge tank; 7. an aerator; 8. a chlorine dioxide generator.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, there will now be described in detail, with reference to the accompanying drawings, a non-limiting detailed description of the present invention.
As shown in figure 1, the integrated membrane bioreactor domestic sewage treatment device comprises a grating tank 1, a regulating tank 2, a hydrolysis acidification tank 3, an integrated membrane biological reaction tank 4, a disinfection tank 5 and a sludge tank 6, wherein an outlet of the grating tank 1 is communicated with an inlet of the regulating tank 2, an outlet of the regulating tank 2 is connected with an inlet of the hydrolysis acidification tank 3 through a suction pump, an outlet of the hydrolysis acidification tank 3 is communicated with an inlet of the integrated membrane biological reaction tank 4, a water outlet of the integrated membrane biological reaction tank 4 is communicated with the disinfection tank 5, and a sludge outlet of the integrated membrane biological reaction tank 4 is communicated with the hydrolysis acidification tank 3 and the sludge tank 6.
A set of stainless steel grating with a grating gap of 5mm is arranged in the grating pool 1.
A set of flow meter, two sets of liquid level meters and two sets of lift pumps are arranged in the regulating tank 2, and the flow rate of the lift pumps is 10m3H, a lift of 10m and a power of 0.75 KW. The flow meter is used for controlling the sewage flow into the regulating reservoir 2; the two sets of liquid level meters are used for controlling the running state of the lift pump, so that the lift pump is prevented from still running in a water-free state.
The effective volume of the hydrolysis acidification tank 3 is 34m3. A set of water-hydrolyzing acidification tank 3 is arranged inside and connected with an aeratorThe perforated pipe of (1) is used for increasing the contact interface between air and waste water and dissolving oxygen in the air into water. An aeration pipe in the hydrolysis acidification tank 3 is connected with the outlet of the aerator 7.
A microporous aerator, a perforated pipe and a membrane component are arranged in the integrated membrane biological reaction tank 4, the membrane component is connected with a self-priming pump and a back-flushing pump, and the microporous aerator and the perforated pipe are connected with an aerator 7. The microporous aerator and the perforated pipe both belong to air diffusion devices, and are used for increasing the contact interface between air and wastewater and dissolving oxygen in the air into water, the microporous aerator belongs to a micro-bubble type air diffusion device, and the perforated pipe belongs to a middle-bubble type air diffusion device. The membrane component is a core component of the membrane bioreactor, pollutants are separated through ultrafiltration, and the membrane component of the embodiment adopts a built-in hollow fiber membrane component. The self-priming pump pumps the treated wastewater out of the membrane bioreactor. The back washing pump is used for washing the polluted membrane component after operating under certain conditions. The sludge pump is used for discharging the residual sludge of the membrane bioreactor.
The disinfectant inlet of the disinfection tank 5 is connected with the outlet of an HB-200 chlorine dioxide generator 8, the generating amount of the chlorine dioxide generator 8 is 200g/h, and the power is 0.4 KW.
A 40QW8-15-1.1 sludge pump is arranged in the sludge tank 6, and the flow rate of the sludge pump is 8m3H, lift 15m, power 1.1 KW.
The domestic sewage treatment method of the integrated membrane bioreactor comprises the following steps:
1) the sewage is introduced into the grid pond 1 to intercept large substances in the sewage. The sewage contains various floating substances and needs to be intercepted by a grating. So as to prevent the subsequent water pump or treatment equipment from being blocked and avoid the increase of the maintenance frequency caused by the precipitation in the subsequent water tank. Because the water quantity is small, the amount of grid slag is small, and in order to reduce the construction cost, an artificial grid is adopted in design, and the grid slag cleaned by the artificial grid and other garbage are periodically transported outwards or incinerated for disposal.
2) After being treated by the grating, the sewage overflows to the regulating tank 2 to balance the water quantity and the water quality. Because the quality of the water discharged by the sewage is very uneven, the quality and the fluctuation of the water quantity of the incoming sewage are large, the quality and the quantity of the water subjected to biochemical treatment can be stable only by introducing the sewage into the regulating tank 2, and the impact load of a subsequent treatment structure is reduced.
3) The sewage is lifted by a pump to enter a hydrolytic acidification tank 3, and various bacteria which can survive in an anaerobic and aerobic state exist in the tank, so that the purposes of hydrolytic acidification and decomposition of the raw water quality into small molecules are achieved. Hydrolytic acidification is accomplished by a wide variety of fermenting bacteria, such as: one or more of clostridium, bacteroides, microzyme, mould and nitrosomonas. The wastewater remained there for about 4 hours, with an expected organic removal of 25%.
4) The wastewater enters an integrated membrane biological reaction tank 4 after hydrolytic acidification treatment. The sewage is fully mixed with suspended and attached microorganisms under the aeration and stirring of the sewage, the aerobic microorganisms in the pool degrade organic matters in the sewage to convert the organic matters into CO2, H2O, inorganic salts, new ecological flora and the like, and the aim of purifying the water quality is fulfilled by filtering the organic matters through a membrane module. The wastewater remained there for about 8 hours, with an expected organic removal of 85%. Part of the sludge generated in the step reflows to the hydrolysis acidification tank 3, the reflow ratio is 300 percent, and the rest sludge is discharged to the sludge tank 6 and then compressed and transported outside at regular time.
5) The sewage is filtered by the membrane component and enters the disinfection tank 5 for disinfection, so that the faecal coliform group number is less than 1000/L, the disinfection uses a chlorine dioxide disinfectant, wherein, sodium chlorate and hydrochloric acid in the chlorine dioxide generator 8 are accurately metered by respective metering devices, and then are put into a reactor for reaction to generate chlorine dioxide gas, and the chlorine dioxide gas is pumped by a jet aerator and mixed with water to prepare the high-efficiency chlorine dioxide disinfectant.
Claims (9)
1. The integrated membrane bioreactor domestic sewage treatment device is characterized by comprising a grating tank, a regulating tank, a hydrolysis acidification tank, an integrated membrane bioreactor, a disinfection tank and a sludge tank, wherein,
the grating tank is used for removing large-particle substances in the sewage;
the inlet of the adjusting tank is communicated with the grating tank and is used for adjusting the water quantity and the water quality;
the inlet of the hydrolysis acidification tank is communicated with the outlet of the regulating tank and is used for hydrolysis acidification;
the inlet of the integrated membrane biological reaction tank is communicated with the hydrolysis acidification tank and is used for removing organic matters;
the inlet of the disinfection tank is communicated with the water outlet of the integrated membrane biological reaction tank and is used for disinfecting the outlet water;
the sludge tank inlet is communicated with the sludge outlet of the integrated membrane biological reaction tank and is used for discharging sludge.
2. The integrated membrane bioreactor domestic sewage treatment device of claim 1 wherein two lift pumps, two sets of level gauges and one set of flow meter are provided in the conditioning tank.
3. The integrated membrane bioreactor domestic sewage treatment device of claim 1, wherein the integrated membrane bioreactor is internally provided with a microporous aerator, a perforated pipe and a membrane module, the membrane module is connected with a self-priming pump and a back-flushing pump, and the microporous aerator and the perforated pipe are connected with an aerator.
4. The integrated membrane bioreactor domestic sewage treatment device of claim 1 wherein the sludge outlet of the integrated membrane bioreactor tank is further communicated with a hydrolysis acidification tank.
5. The integrated membrane bioreactor domestic sewage treatment unit of claim 1 wherein the disinfectant inlet of the disinfection tank is connected to a chlorine dioxide generator.
6. The domestic sewage treatment method of the integrated membrane bioreactor is characterized by comprising the following steps:
1) the sewage enters the adjusting tank to adjust the water quantity and the water quality after being introduced into the grid tank, and the flow of the sewage entering the adjusting tank is controlled by a flowmeter;
2) lifting the sewage in the step 1) to a hydrolysis acidification tank, adding fermentation bacteria to carry out hydrolysis acidification on the water, wherein the hydraulic retention time is 4 hours;
3) introducing the sewage obtained in the step 2) into an integrated membrane biological reaction tank, fully mixing the sewage with suspended and attached microorganisms by aeration stirring, degrading organic matters in the sewage by aerobic microorganisms in the tank, enabling the quality of effluent to reach the standard through a membrane component, refluxing one part of sludge generated in the process to a hydrolysis acidification tank, and discharging the other part of sludge after the other part of sludge enters a sludge tank for treatment;
4) and (3) introducing the liquid in the step 3) into a chlorine dioxide disinfection tank, and discharging the liquid after the number of faecal coliform bacteria is less than 1000 per L after disinfection.
7. The integrated membrane bioreactor domestic sewage treatment method of claim 6 wherein said fermenting bacteria in step 2) comprises one or more of Clostridium, Bacteroides, yeast, mold and Nitrosomonas.
8. The method for treating domestic sewage by using an integrated membrane bioreactor according to claim 6, wherein the dissolved oxygen in the integrated membrane bioreactor in the step 3) is 2-2.5 mg/L, and the aeration intensity is 60-80 m3/(m2·h)。
9. The method for treating domestic sewage with an integrated membrane bioreactor according to claim 6, wherein the membrane flux of the membrane module in the integrated membrane bioreactor in step 3) is 20L · (m)2/h)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010328671.6A CN111439892A (en) | 2020-04-23 | 2020-04-23 | Domestic sewage treatment device and method with integrated membrane bioreactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010328671.6A CN111439892A (en) | 2020-04-23 | 2020-04-23 | Domestic sewage treatment device and method with integrated membrane bioreactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112499913A (en) * | 2020-12-30 | 2021-03-16 | 魏一明 | Enhanced nitrogen and phosphorus removal domestic sewage treatment method |
| CN115594338A (en) * | 2022-09-30 | 2023-01-13 | 北京城市排水集团有限责任公司（Cn） | Household sewage treatment system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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