CN113264586A - MBR (membrane bioreactor) process for treating nitrate wastewater - Google Patents
MBR (membrane bioreactor) process for treating nitrate wastewater Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002351 wastewater Substances 0.000 title claims abstract description 29
- 229910002651 NO3 Inorganic materials 0.000 title claims abstract description 26
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000012528 membrane Substances 0.000 title claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 238000005273 aeration Methods 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 5
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- 239000012510 hollow fiber Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- 241000894006 Bacteria Species 0.000 abstract description 12
- 239000010865 sewage Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000005714 functional activity Effects 0.000 abstract description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 238000011001 backwashing Methods 0.000 description 4
- 238000005276 aerator Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 230000002572 peristaltic effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an MBR (membrane bioreactor) process for treating nitrate wastewater, which relates to the technical field of sewage treatment and comprises a water inlet adjusting tank, an MBR reaction tank and a clean water tank. The invention combines the membrane bioreactor with the denitrification technology for the first time, and enables the environmental factors to be more suitable for the growth and enrichment of denitrifying bacteria by optimizing the temperature, the pH value, the carbon-nitrogen ratio and the dissolved oxygen concentration. The nitrogen stripping device is used for aeration, so that the dissolved oxygen is reduced, simultaneously, the substance mixing is enhanced, the functional activity of denitrifying bacteria is fully exerted, a better effect can be obtained in the treatment of nitrate wastewater, particularly high-concentration nitrate wastewater, and the nitrogen stripping device has stronger impact resistance, and provides a new idea for the treatment of high-concentration nitrate. In addition, the membrane bioreactor for treating nitrate wastewater and the application method thereof have the advantages of simple operation, small occupied area and cost saving, and particularly have higher practical value under the condition that the site resources of sewage plants are limited.
Description
Technical Field
The invention belongs to the field of water treatment technology application, and particularly relates to an MBR (membrane bioreactor) process for treating nitrate wastewater, which is mainly used for deeply removing nitrate nitrogen and nitrite nitrogen in wastewater by improving the growth environment of microorganisms in a reactor and improving the degradation capability of the microorganisms.
Background
The social economy develops rapidly, and the environmental pollution problem is more and more outstanding simultaneously, and traditional denitrification device has the power consumption height, operates complicacy, handles that the load is low, handles nitrate nitrogen concentration low, area is big, the range of application is little, the process flow is long, the operation flow is complicated scheduling problem. Therefore, a new denitrification apparatus is urgently required to solve the above problems.
MBR is a novel high-efficiency water treatment technology combining an activated sludge process and a membrane separation technology. The method can realize effective separation of Hydraulic Retention Time (HRT) and Sludge Retention Time (SRT), is beneficial to enriching active microorganisms with long proliferation period, and has good effluent quality. By combining the denitrification technology with the MBR process, the enrichment of denitrifying bacteria can be realized by controlling the environmental conditions. In the operation process of the MBR, the concentration of dissolved oxygen is an important influence factor for realizing denitrification of the MBR. Denitrifying bacteria generally grow under the anoxic condition, and researches show that the denitrifying bacteria can be inhibited from degrading nitrate by the dissolved oxygen concentration in the biomembrane reactor which is higher than 0.5 mg/L. In the traditional method, an anoxic environment is created by stirring, but the water body still contains high dissolved oxygen concentration, so that the enrichment of denitrifying bacteria is influenced, and the nitrogen removal is incomplete.
The invention provides an MBR process for treating nitrate wastewater, which utilizes nitrogen to blow off to solve the influence of dissolved oxygen on denitrifying bacteria, utilizes a nitrogen recovery device to collect nitrogen, saves cost, and simultaneously adds filler in a reactor, thereby not only delaying the pollution problem of an MBR membrane, but also enriching a high-concentration denitrifying bacteria community to achieve the purpose of deep and efficient denitrification.
Disclosure of Invention
In view of the above problems of conventional denitrification, the present invention provides an MBR process for treating nitrate-containing wastewater in combination with the above background art.
The technical scheme of the invention is as follows:
the invention integrates MBR process for treating nitrate wastewater into integrated equipment, which comprises three parts, namely a water inlet adjusting tank, an MBR reaction tank and a clean water tank, wherein the three parts respectively have the following functions:
the water inlet adjusting tank comprises phosphorus, caustic soda dosing pumps, an aeration head, a pH meter and organic wastewater (supplementing carbon sources). Wherein the adding amount of phosphorus and caustic soda is controlled by a peristaltic pump. And the water inlet adjusting tank provides inlet water for the MBR reaction tank.
The MBR reaction tank comprises an MBR hollow fiber composite membrane, an aeration pipe, a water inlet pipe, a pH meter, a dissolved oxygen meter, anaerobic activated sludge, an aeration head and a nitrogen recovery device. The inside center of reactor is located to MBR hollow fiber complex film, and the aeration pipe evenly sets up the bottom in the reactor body, and the interval of adjacent aeration pipe is 20 cm, and the aeration pipe initiating terminal is connected nitrogen gas and is blown off the device, gives the reactor aeration with the nitrogen gas that the purity is 99.99%, is used for getting rid of the dissolved oxygen in the water on the one hand, and on the other hand is used for the mixture of the interior material of reactor. And the pH meter and the dissolved oxygen meter are continuously monitored on line, so that the optimal growth environment required by denitrifying bacteria in the reactor is ensured. The anaerobic sludge is activated sludge in an anoxic tank of a chemical sewage treatment plant, and the sludge concentration is not less than 8500 mg/L. The nitrogen recovery device is used for recovering nitrogen lost in the aeration process, and the recovered nitrogen is used for aeration of the regulating tank and the MBR reaction tank, so that the utilization rate of the nitrogen is further improved. The running temperature of the MBR reaction tank is 25-30 ℃, the pH value is 7.0-7.5, the carbon-nitrogen ratio is 5:1-4:1, the filling rate of the filler is 1/5-1/4, the dissolved oxygen is 0.0-0.5 mg/L, and the wastewater is purified in the MBR reaction tank.
The clean water tank comprises a water outlet pipe, an electromagnetic valve and a backwashing pump. The purified wastewater enters a clean water tank through an MBR membrane. And the backwashing pump is used for cleaning the MBR membrane in the reaction tank at regular time. The backwashing interval time is 1 h and the backwashing time is 2 min.
The invention is characterized in that: the MBR process is combined with the denitrification technology, the defects of high energy consumption, low treatment load, large occupied area and the like in the nitrate wastewater treatment by the traditional process (A/O) are overcome, and the environmental factors are more suitable for growth and enrichment of denitrifying bacteria by optimizing the temperature, the pH value, the carbon-nitrogen ratio and the dissolved oxygen concentration. The invention further improves the aeration mode, solves the problem that the traditional stirring method is not thorough in removing dissolved oxygen in water, uses the nitrogen stripping device for aeration, enhances the substance mixing while reducing the concentration of the dissolved oxygen, fully exerts the functional activity of denitrifying bacteria, and can obtain better effect in the treatment of nitrate wastewater, particularly high concentration. The denitrifying bacteria enriched by the reactor have stronger impact resistance, and a new idea is provided for treating high-concentration nitrate wastewater. The invention is provided with the nitrogen recovery device, improves the utilization rate of nitrogen, reduces the cost and has stronger practical value.
Drawings
FIG. 1 is a schematic diagram of MBR process for treating high-nitrate wastewater
Reference numerals
1-high concentration nitrate wastewater; 2-organic waste water; 3-nutrient solution; 4-a peristaltic pump; 5-pH meter; 6-a submersible sewage pump; 7-an aerator; 8-an electromagnetic valve; 9-a water inlet flow meter; 10-an electromagnetic valve; 11-a regulating valve; 12-nitrogen recovery unit; 13-a regulating valve; 14-a pH meter; 15-dissolved oxygen instrument; 16-an aerator; 17-a filler; 18-MBR membrane; 19-an aerator pipe; 20-a nitrogen stripping device; 21-a self-priming pump; 22-a solenoid valve; 23-water outlet flow meter; 24-backwash pump; 25-a solenoid valve; 26-a regulating reservoir; 27-MBR reaction tank; 28-clean water pool; 29-PLC automatic control system.
Detailed Description
The invention is further illustrated by way of example in the following figures:
FIG. 1 is a schematic diagram of MBR process for treating high-nitrate wastewater
The reaction apparatus was set up as shown in fig. 1, and the MBR operating process flow was described as follows:
high-concentration nitrate wastewater and organic wastewater respectively enter an adjusting tank 26 through a water inlet pipe 1 and a water inlet pipe 2, nutrient solution 3 is quantitatively added into the adjusting tank 26 through a peristaltic pump 4, and a pH meter 5 is used for monitoring the pH value in the adjusting tank 26 in real time; the adjusting tank 26 discharges water through the submersible pump 6, the water reaches the MBR reaction tank 27 through the electromagnetic valve 8 and the water inlet electromagnetic flowmeter 9, and the pH meter 14 and the dissolved oxygen meter 15 monitor the pH value and the dissolved oxygen concentration in the MBR reaction tank 27 in real time; the nitrogen stripping device 20 conveys nitrogen to the bottom of the MBR reaction tank 27 through the aeration pipe 19, in order to further improve the utilization rate of the nitrogen, excessive nitrogen in the MBR reaction tank enters the nitrogen recovery device 12 through the electromagnetic valve 10 for recovery and purification, the purified nitrogen enters the regulating tank 26 and the MBR reaction tank 27 through the gas flow regulating valve 11 and the regulating valve 13 respectively, and finally nitrogen is uniformly released through the aeration head 7 and the aeration head 16; the MBR reaction tank 27 contains filler and is used for enriching high-concentration denitrifying flora, so that the treatment effect is better. The sewage is subjected to mud-water separation through the MBR membrane 18, the sludge is left in the MBR reaction tank 27, the treated sewage flows through the electromagnetic valve 22 and the water outlet flow meter 23 through the suction pump 21 and enters the clean water tank 28, part of the sewage which is treated by the clean water tank 28 and reaches the standard is periodically backwashed for the MBR membrane 18 through the backwash pump 24, and the rest sewage is discharged into a municipal sewage pipe network. The operation of the whole system is controlled by a PLC.
Example 1
The MBR process for treating high-concentration nitrate wastewater disclosed by the invention is used for treating adipic acid wastewater of a certain chemical plant. The equalizing basin is the plastic drum of the high 1 m of diameter 80 cm, the MBR reaction tank is high 2 m, long 2 m, the carbon steel cuboid of wide 1.2 m, MBR hollow fiber membrane is placed inside the reactor, nitrogen gas blows off the device and sets up on MBR reaction tank next door, carry to the reaction tank bottom through the aeration pipe, nitrogen gas recovery unit installs at MBR reaction tank top, collect purified nitrogen gas and pass through pipeline transport to equalizing basin and MBR reaction tank bottom, its effect is for letting sewage and the abundant mixing of nutrient solution on the one hand, the dissolved oxygen of aquatic in on the other hand discharge equalizing basin and the MBR reaction tank. The filling rate of the filler is 1/4, the sludge concentration in the MBR reaction tank is 10000 mg/L, the nitrate nitrogen concentration of the influent adipic acid is 1200 mg/L, the concentration of the effluent nitrate nitrogen is lower than 6 mg/L and the removal rate is higher than 99 percent after continuous detection for seven days, the continuous long-time operation is realized, the effluent quality is stable, and the monitoring data are shown in Table 1.
Table 1 monitoring data for example 1
Example 2
The MBR process for treating high-concentration nitrate wastewater disclosed by the invention is used for treating production wastewater of a petrochemical enterprise, the left side is a regulating tank, the cuboid which is 1.5 m long, 1 m wide and 1 m high and is welded is a cuboid, the middle part is an MBR reaction tank with the side length of 1.5 m, and the right side is an MBR water outlet tank. The inside MBR membrane that sets up of reactor, nitrogen gas blow off the device and set up on MBR reaction tank the right, and for MBR reaction tank aeration get rid of dissolved oxygen, nitrogen gas recovery unit installs on the MBR reaction tank the left side, and the nitrogen gas of collecting is arranged in getting rid of the dissolved oxygen in equalizing basin and the MBR reaction tank. The filling rate of the filler is 1/5, the sludge concentration in the MBR reaction tank is 8500 mg/L, the nitrate nitrogen concentration in the production wastewater is 700-plus-1000 mg/L, the MBR integrated device continuously operates for seven days to measure the nitrate nitrogen concentration index, the nitrate nitrogen concentration of the effluent is lower than 5.5 mg/L, the removal rate is higher than 99%, the MBR integrated device continuously operates stably for a long time, basically has no fault, the effluent quality is stable, and the monitoring data are shown in Table 2.
Table 2 monitoring data for example 2
As described above, although the present invention is illustrated by examples, it should not be construed as limiting the present invention. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. An MBR process for treating nitrate wastewater, which is characterized in that: integrating the process in an integrated apparatus comprising three parts: the high-concentration nitrate wastewater treatment system comprises a water inlet adjusting tank (26), an MBR reaction tank (27) and a clean water tank (28), wherein the high-concentration nitrate wastewater (1) enters the MBR reaction tank (27) after passing through the water inlet adjusting tank (26), and flows to the clean water tank (28) after being subjected to biochemical treatment in the MBR reaction tank;
the MBR reaction tank (27) comprises: MBR hollow fiber composite membrane (18), aeration pipe (19), pH meter (14), dissolved oxygen appearance (15), anaerobic activated sludge, nitrogen gas blow-off device (20), nitrogen gas recovery unit (12), filler (17).
2. The MBR process of claim 1, wherein: the MBR reaction tank (27) has the internal temperature of 25-30 ℃, the sludge concentration of not less than 8500 mg/L, the pH value of 7.0-7.5, the carbon-nitrogen ratio of 5:1-4:1, the filling rate of the filler of 1/5-1/4 and the dissolved oxygen concentration of 0.01-0.5 mg/L.
3. The MBR process of claim 1, wherein: and the nitrogen stripping device (20) is used for aerating the MBR reaction tank (27), so that the concentration of dissolved oxygen in the MBR reaction tank (27) is reduced, and the mixing of substances in the MBR reaction tank (27) is enhanced.
4. The MBR process of claim 1, wherein: and recovering and purifying the nitrogen in the MBR reaction tank (27) by using the nitrogen recovery device (12), and then using the nitrogen for aeration of the water inlet regulating tank (26) and the MBR reaction tank (27).
5. The MBR process of claim 1, wherein: the concentration of the high-concentration nitrate wastewater (1) is 700-1200 mg/L, and the concentration of the nitrate in the effluent is reduced to be below 6 mg/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110612185.1A CN113264586A (en) | 2021-06-02 | 2021-06-02 | MBR (membrane bioreactor) process for treating nitrate wastewater |
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| CN202110612185.1A CN113264586A (en) | 2021-06-02 | 2021-06-02 | MBR (membrane bioreactor) process for treating nitrate wastewater |
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| GB2625178A (en) * | 2022-06-23 | 2024-06-12 | Hunan Brunp Recycling Tech Co Ltd | Backflow unit and sewage treatment system |
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| US12172914B2 (en) | 2022-06-23 | 2024-12-24 | Guangdong Brunp Recycling Technology Co., Ltd. | Reflux unit and sewage treatment system |
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