CN110963605A - Backwashing wastewater treatment and recycling system for water supply plant - Google Patents
Backwashing wastewater treatment and recycling system for water supply plant Download PDFInfo
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- CN110963605A CN110963605A CN201911253942.XA CN201911253942A CN110963605A CN 110963605 A CN110963605 A CN 110963605A CN 201911253942 A CN201911253942 A CN 201911253942A CN 110963605 A CN110963605 A CN 110963605A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/206—Manganese or manganese compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of water treatment, and particularly relates to a backwashing wastewater treatment and recycling system for a water supply plant. The invention aims at the back flush wastewater reuse treatment of a high-pollutant water supply plant, and mainly comprises a back flush water regulating tank, a coagulation tank, an ultrafiltration treatment tank, a nanofiltration treatment tank and a membrane treatment sewage collecting tank; removing suspended solids, colloidal substances, organic matters, pathogenic microorganisms and the like through a hollow fiber ultrafiltration membrane component of an ultrafiltration treatment tank; suspended solids, organic matters and pathogenic microorganisms in water are further intercepted through a nanofiltration membrane component in a nanofiltration membrane treatment tank, effluent microorganism indexes and heavy metals such as iron and manganese are reduced, and effluent safety is ensured; and (4) treating concentrated water by the ultrafiltration membrane and the nanofiltration membrane, and then uniformly treating and discharging the concentrated water in a sewage collecting tank. The invention has simple process, clear flow and good effluent quality, and can be directly reused in the raw water distribution well of the water production process of a water plant; the invention has important significance for treating and recycling the back flush wastewater of the urban water supply plant.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a backwashing wastewater treatment and recycling system for a water supply plant.
Technical Field
The water supply plant can produce a large amount of production wastewater, namely sludge discharge wastewater and backwashing wastewater, while producing drinking water. The backwashing wastewater has the characteristics of high suspended matter, high organic matter and high heavy metal, is difficult to treat, has large water quantity, and accounts for 3-7 percent of the water for the water making process of a water plant. Before the 80 s in the 20 th century, the direct discharge of sludge discharge and backwashing wastewater of water supply plants in China has been the main issue. With the development of economy, the pollution problem of directly discharged sludge discharge water and backwash wastewater to the environment is more and more concerned by society. Therefore, after 80 years, China carries out work of treating production wastewater successively, so far most of water plants in China have preliminarily established structures for treating and recycling backwash wastewater, but backwash wastewater of water plants in some small towns is still directly discharged. The established backwashing wastewater treatment and recycling process mainly comprises the steps of discharging or recycling pre-concentrated supernatant, concentrating sludge at the bottom of a pre-concentration tank and sludge discharge water together, discharging or recycling the supernatant, and transporting dewatered sludge at the bottom of the concentration tank to outside. However, as water resources are increasingly in shortage, the treatment and discharge of backwash wastewater cannot meet the requirements of the modern environment protection and society, and the reuse of backwash wastewater is gradually concerned by people.
The main pollutants in the backwashing wastewater are suspended solids, colloidal substances, organic matters, heavy metals and microorganisms. As the pollutants are further concentrated by the conventional treatment process, the content level of the pollutants is high, and the types of the pollutants are multiple, the water quality safety of the backwashing wastewater should be emphasized more. The flocculation process can quickly and effectively remove suspended solids, colloidal substances and macromolecular organic matters in water, and in addition, part of heavy metals can be intercepted and adsorbed by alum floc generated by coagulation so as to be removed. The ultrafiltration is also applied to a water recycling process, residual solid particles, organic matters, pathogenic microorganisms and the like in water can be removed, and the turbidity of ultrafiltration effluent is basically zero. Nanofiltration can further remove solid particles, organic matters and microorganisms which are not removed by ultrafiltration, and particularly has good treatment effect on heavy metals which cannot be removed by ultrafiltration. The invention is based on the principles of coagulation and membrane filtration, adopts the coagulation-ultrafiltration-nanofiltration combined process to recycle the backwashing wastewater of the water supply plant, and has the advantages of good effluent quality, convenient operation, convenient maintenance and no pollution. The invention meets the requirements of energy saving, environmental protection, no pollution and realization of near zero discharge in the treatment of the production wastewater of water supply plants in China.
Disclosure of Invention
The invention aims to provide a backwashing wastewater treatment and recycling system for a water supply plant, which has the advantages of strong capability of removing solid particles, organic matters, heavy metals and pathogenic microorganisms, small occupied area, convenient management, low operation cost and good effluent quality.
The invention relates to a backwashing wastewater treatment and recycling system for a water supply plant, which aims at the backwashing water of the water supply plant with high solid particles, high organic matters and high heavy metals for recycling, and comprises the steps of removing suspended solids, colloidal substances, macromolecular organic matters and part of heavy metals through flocculation reinforcement; the removal of organic matters, solid particles and pathogenic microorganisms is realized through an ultrafiltration membrane component, and the water quality safety of effluent is ensured; and residual organic matters, solid particles, pathogenic microorganisms, heavy metals and the like are further removed through the nanofiltration membrane component, so that the water quality safety of the effluent is further ensured.
The invention relates to a backwashing wastewater treatment and recycling system for a water supply plant, which has a structure shown in figure 1 and comprises:
a backwashing water adjusting tank 1 for collecting and adjusting backwashing wastewater of a water supply plant;
a flocculation tank 5 arranged behind the backwashing water adjusting tank 1;
a sewage submersible pump 2, a medicine feeding pump 3 and a medicine box 4; the submersible sewage pump 2 is used for pumping back washing water to the flocculation tank 5, and adding a flocculating agent in the medicine tank 4 to the flocculation tank 5 through the medicine adding pump 3 in a water inlet pipeline;
an immersed hollow ultrafiltration membrane component is arranged in the middle of the ultrafiltration membrane pool 6, and the immersed hollow ultrafiltration membrane component is used for pressurizing and filtering the effluent through a submersible axial-flow pump;
an intermediate water tank 7 for receiving the effluent of the ultrafiltration membrane tank and the influent of the nanofiltration membrane tank;
a nanofiltration membrane pool 8 arranged behind the middle water tank 7, wherein an immersed hollow nanofiltration membrane component is arranged in the middle of the nanofiltration membrane pool 8, and the immersed hollow nanofiltration membrane component is used for pressurizing and filtering the effluent through a submersible axial-flow pump;
a sewage collecting tank 10 for collecting concentrated water generated by the ultrafiltration membrane and nanofiltration membrane treatment;
and a backwashing water tank 11 for backwashing of the ultrafiltration membrane and the nanofiltration membrane.
The invention relates to a backwashing wastewater treatment and recycling system for a water supply plant, which comprises the following treatment and recycling processes: the back washing wastewater of the urban water supply plant enters an adjusting tank 1, after the water quantity is adjusted in the adjusting tank 1, back washing water is pumped to a flocculation tank 5 through a submersible sewage pump 2, a polyaluminium chloride polysulfide flocculating agent in a medicine tank 4 is added to the flocculation tank 5 through a dosing pump 3 in a water inlet pipeline, and a coagulation process is carried out to generate a large amount of alum floc; the effluent of the flocculation tank 5 flows to an ultrafiltration membrane treatment tank 6 by gravity; after the immersed hollow ultrafiltration membrane component in the ultrafiltration membrane pool 6 finishes the ultrafiltration membrane filtration process, membrane water outlet is carried out through the submersible axial-flow pump; the effluent of the ultrafiltration membrane pool 6 enters an intermediate water tank 7; the nanofiltration membrane pool 8 is filled with water from the middle water tank 7 and finishes the nanofiltration membrane filtration process through an immersed hollow nanofiltration membrane component arranged in the nanofiltration membrane pool 8; the effluent of the nanofiltration membrane pool 8 enters a return water pool 9 and is sent to a raw water distribution well (namely, recycled) of a water making process of a water supply plant; concentrated water generated by the ultrafiltration membrane and nanofiltration membrane treatment enters a sewage collecting tank 10 through a set pipeline for further sludge treatment; the backwash water tank 11 supplies backwash water to the ultrafiltration membrane tank 6 and the nanofiltration membrane tank 8.
In the invention, the adding amount of the polyaluminum chloride polysulfide flocculant is controlled to be 15-20mg/L, the preferable adding concentration is 15-18 mg/L, and the optimal adding concentration is 16 mg/L; tests show that alum floc formed under the operating parameters is good, and the effect of removing turbidity, organic matters, partial heavy metals and pathogenic microorganisms of backwash water is good.
In the invention, the filtration cycle of the immersed hollow ultrafiltration membrane component arranged in the ultrafiltration membrane pool and the immersed hollow nanofiltration membrane component arranged in the nanofiltration membrane pool is 30-120 min; and after the water outlet of each operation period is finished, carrying out physical backwashing once, returning backwashing water from the backwashing water tank 11 to the membrane treatment unit, carrying out chemical backwashing once in 5-6 days, adding sodium hypochlorite midway in the physical backwashing pipeline, soaking for 30-40min, emptying the membrane tank, and filtering the inlet water again.
In the invention, an ultrafiltration membrane filtering process is carried out in the ultrafiltration membrane pool 6, specifically, the backwashing wastewater enters the flocculation pool to finish a flocculation process after the water quantity of the regulating pool is regulated, the water treated by the flocculation pool 5 flows to the ultrafiltration membrane pool 6 by gravity, and the flocculation pretreatment is carried out, so that the removal effect of the ultrafiltration membrane on turbidity, organic matters, partial heavy metals and pathogenic microorganisms is improved, and the membrane pollution is also improved to a certain extent.
In the invention, the backwashing wastewater filtered by the ultrafiltration membrane enters the intermediate water tank 7, the intermediate water tank has a buffering and regulating effect on the water treated by the ultrafiltration membrane, and water enters the submerged hollow nanofiltration membrane component arranged in the nanofiltration membrane tank 8 after the operation period of the nanofiltration membrane tank begins.
In the invention, a nanofiltration membrane filtering process is carried out in the nanofiltration membrane tank 8, wherein the arranged immersed hollow nanofiltration membrane component mainly plays a filtering role, most organic matters and pathogenic microorganisms in water treated by the ultrafiltration membrane tank 6 are effectively intercepted, solid particles, organic matters and pathogenic microorganisms can be further removed by the nanofiltration membrane treatment, the indexes of effluent microorganisms and heavy metals such as iron and manganese are reduced, and the effluent safety is ensured. After flocculation-ultrafiltration treatment, the quality of inlet water of the nanofiltration membrane pool is obviously optimized, substances which greatly contribute to the pollution of the nanofiltration membrane are partially removed, and the normal operation and the service life of the nanofiltration membrane are promoted.
In the invention, concentrated water generated by the treatment of the ultrafiltration membrane tank 6 and the nanofiltration membrane tank 8 is collected into the sewage collection tank 10 through pipelines, and the concentrated water subjected to membrane treatment in the sewage collection tank can be discharged into a sludge discharge water regulating tank for simultaneous treatment by combining with the actual conditions of a water supply plant.
The invention has the beneficial effects that: the invention arranges the flocculation tank behind the regulating tank and in front of the ultrafiltration membrane tank, improves the removal effect of the ultrafiltration membrane on turbidity, organic matters, partial heavy metals and pathogenic microorganisms through a flocculation process, also has a certain improvement effect on membrane pollution, and greatly improves the effect and the service life of the whole process flow. Solid particles, organic matters and pathogenic microorganisms are removed through the immersed hollow fiber ultrafiltration membrane component, the turbidity of the effluent is basically zero, and the water quality safety of the effluent is ensured. An intermediate water tank is arranged behind the ultrafiltration membrane tank, and plays a role in buffering and adjusting the subsequent nanofiltration membrane treatment. The nanofiltration membrane tank is arranged behind the middle water tank, so that residual solid particles, organic matters and pathogenic microorganisms in water are further removed, the effluent microorganism indexes and the contents of heavy metals such as iron, manganese and the like are reduced, the effluent safety is further ensured, and the water quality in the reuse water tank meets the reuse requirements. Compared with the traditional backwashing water treatment process of a water supply plant, the invention has the advantages of good effluent quality, basically no pollutant discharge, capability of realizing the reuse of backwashing water (backwater reaches the water quality standard of surface water type 3), high backwashing wastewater treatment efficiency and long service life due to the combination of flocculation, ultrafiltration and nanofiltration, and has the protection effect on subsequent nanofiltration membranes, the membrane pollution problem is improved due to the flocculation and ultrafiltration, and the invention has wide environmental protection, economic benefit and application prospect.
Drawings
FIG. 1 is a flow chart of the structure of the backwashing wastewater treatment and recycling system of the water supply plant.
Reference numbers in the figures: 1-backwashing water regulating tank, 2-submersible sewage pump, 3-dosing pump, 4-medicine tank, 5-flocculation tank, 6-ultrafiltration membrane tank, 7-intermediate water tank, 8-nanofiltration membrane tank, 9-reuse water tank, 10-sewage collecting tank and 11-backwashing water tank.
Detailed Description
The embodiments of the invention will be further described with reference to the accompanying drawings in which:
as shown in the attached drawing, the invention relates to a backwashing wastewater treatment and recycling system for a water supply plant, which comprises a sludge water discharge regulating tank 1, a submersible sewage pump 2, a dosing pump 3, a medicine tank 4, a flocculation tank 5, an ultrafiltration membrane tank 6, an intermediate water tank 7, a nanofiltration membrane tank 8, a reuse water tank 9, a sewage collection tank 10 and a backwashing water tank 11. The backwashing wastewater is regulated by the regulating reservoir 1, then is pumped to the flocculation tank 5 by the submersible sewage pump 2, and is added with the polysulphide aluminium chloride flocculant in the medicine tank 4 into the flocculation tank 5 by the dosing pump 3 in the water inlet pipeline, the dosage of the polysulphide aluminium chloride is 15-20mg/L, and a great amount of alum floc is generated in the coagulation process. The effluent of the flocculation tank 5 flows to an ultrafiltration membrane treatment tank 6 by gravity; after the immersed hollow ultrafiltration membrane component in the ultrafiltration membrane pool 6 finishes the ultrafiltration membrane filtration process, membrane water outlet is carried out through the submersible axial-flow pump; the effluent of the ultrafiltration membrane pool 6 enters an intermediate water tank 7; the nanofiltration membrane pool 8 is filled with water from the middle water tank 7 and finishes the nanofiltration membrane filtration process through an immersed hollow nanofiltration membrane component arranged in the nanofiltration membrane pool 8; the outlet water of the nanofiltration membrane tank 8 enters a reflux water tank 9 (reaching the water quality standard of surface water class 3); concentrated water generated by the ultrafiltration membrane and nanofiltration membrane treatment enters a sewage collecting tank 10 through a set pipeline, and then sewage in the sewage collecting tank is discharged into a sludge discharge water regulating tank to be treated together with sludge discharge water; the backwash water tank 11 supplies backwash water to the ultrafiltration membrane tank 6 and the nanofiltration membrane tank 8.
Claims (4)
1. The utility model provides a backwash wastewater treatment recycling system of water supply plant which characterized in that includes:
a backwashing water adjusting tank (1) for collecting and adjusting backwashing wastewater of a water supply plant;
a flocculation tank (5) arranged behind the backwashing water adjusting tank (1);
a sewage submersible pump (2), a dosing pump (3) and a medicine box (4); the submersible sewage pump (2) is used for pumping back washing water to the flocculation tank (5), and a flocculating agent in the medicine box (4) is added to the flocculation tank (5) through the medicine adding pump (3) in a water inlet pipeline;
the ultrafiltration membrane pool (6) is arranged behind the flocculation pool (5), an immersed hollow ultrafiltration membrane component is arranged in the middle of the ultrafiltration membrane pool (6), and the immersed hollow ultrafiltration membrane component is used for pressurizing and filtering the effluent through a submersible axial-flow pump;
an intermediate water tank (7) for receiving the water outlet of the ultrafiltration membrane tank and the water inlet of the nanofiltration membrane tank;
a nanofiltration membrane pool (8) arranged behind the middle water tank (7), wherein an immersed hollow nanofiltration membrane component is arranged in the middle of the nanofiltration membrane pool (8), and the immersed hollow nanofiltration membrane component is used for pressurizing and filtering the effluent through a submersible axial-flow pump;
a sewage collecting tank (10) for collecting concentrated water generated by the treatment of the ultrafiltration membrane and the nanofiltration membrane;
a backwashing water tank (11) for backwashing the ultrafiltration membrane and the nanofiltration membrane.
2. The backwashing wastewater treatment and recycling system of a water supply plant as claimed in claim 1, wherein the treatment and recycling process comprises: the backwashing wastewater of the water supply plant enters an adjusting tank (1), after the water quantity is adjusted in the adjusting tank (1), backwashing water is pumped to a flocculation tank (5) through a submersible sewage pump (2), a polyaluminium chloride sulfate flocculating agent in a medicine tank (4) is added to the flocculation tank (5) through a medicine adding pump (3) in a water inlet pipeline, and a great amount of alum floc is generated in a coagulation process; the effluent of the flocculation tank (5) flows to an ultrafiltration membrane treatment tank (6) by gravity; after the immersed hollow ultrafiltration membrane component in the ultrafiltration membrane pool (6) finishes the filtration process of the ultrafiltration membrane, the submerged axial-flow pump is used for membrane water outlet; the effluent of the ultrafiltration membrane pool (6) enters an intermediate water tank (7); the nanofiltration membrane pool (8) is filled with water from the middle water tank (7) and finishes the nanofiltration membrane filtration process through an immersed hollow nanofiltration membrane component arranged in the nanofiltration membrane pool (8); the effluent of the nanofiltration membrane pool (8) enters a reflux water pool (9) and is sent to a raw water distribution well of a water making process of a water supply plant; concentrated water generated by the ultrafiltration membrane and nanofiltration membrane treatment enters a sewage collecting tank (10) through a set pipeline for further sludge treatment; the backwashing water tank (11) provides backwashing water for the ultrafiltration membrane pool (6) and the nanofiltration membrane pool (8).
3. The backwashing wastewater treatment and recycling system of a water supply plant as claimed in claim 1, wherein the concentration of the added polyaluminum chloride is controlled to be 15-20 mg/L.
4. The backwashing wastewater treatment and recycling system of a water supply plant of claim 1, wherein the filtration cycle of the submerged hollow ultrafiltration membrane module arranged in the ultrafiltration membrane tank and the submerged hollow nanofiltration membrane module arranged in the nanofiltration membrane tank is 30-120 min; and after the water outlet of each operation period is finished, carrying out physical backwashing once, returning backwashing water from the backwashing water tank 11 to the membrane treatment unit, carrying out chemical backwashing once in 5-6 days, adding sodium hypochlorite midway in the physical backwashing pipeline, soaking for 30-40min, emptying the membrane tank, and filtering the inlet water again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911253942.XA CN110963605A (en) | 2019-12-10 | 2019-12-10 | Backwashing wastewater treatment and recycling system for water supply plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285510A (en) * | 2020-04-24 | 2020-06-16 | 李杉 | Wastewater treatment method in membrane treatment system |
| CN114804298A (en) * | 2022-04-07 | 2022-07-29 | 天津美天水环境科技有限公司 | Membrane-process tap water plant production wastewater treatment system and method |
| CN115228292A (en) * | 2022-08-02 | 2022-10-25 | 浙江大拓印染有限公司 | Water recycling device in ultrafiltration system |
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| CN101376546A (en) * | 2008-09-02 | 2009-03-04 | 北京桑德环保集团有限公司 | Coking advanced waste treatment system and processing method |
| CN102432117A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Deep purification treatment method for sewage |
| CN108083546A (en) * | 2017-12-28 | 2018-05-29 | 黑龙江华美亿丰环境工程有限公司 | It is a kind of for the magnetic flocculation-enhanced film integrating device of oil sand tailing wastewater treatment and the processing method of oil sand tailing waste water |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101376546A (en) * | 2008-09-02 | 2009-03-04 | 北京桑德环保集团有限公司 | Coking advanced waste treatment system and processing method |
| CN102432117A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Deep purification treatment method for sewage |
| CN108083546A (en) * | 2017-12-28 | 2018-05-29 | 黑龙江华美亿丰环境工程有限公司 | It is a kind of for the magnetic flocculation-enhanced film integrating device of oil sand tailing wastewater treatment and the processing method of oil sand tailing waste water |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111285510A (en) * | 2020-04-24 | 2020-06-16 | 李杉 | Wastewater treatment method in membrane treatment system |
| CN111285510B (en) * | 2020-04-24 | 2022-05-31 | 李杉 | Wastewater treatment method in membrane treatment system |
| CN114804298A (en) * | 2022-04-07 | 2022-07-29 | 天津美天水环境科技有限公司 | Membrane-process tap water plant production wastewater treatment system and method |
| CN115228292A (en) * | 2022-08-02 | 2022-10-25 | 浙江大拓印染有限公司 | Water recycling device in ultrafiltration system |
| CN115228292B (en) * | 2022-08-02 | 2023-12-12 | 浙江大拓印染有限公司 | Water recycling device in ultrafiltration system |
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Application publication date: 20200407 |