CN116143308A - Wastewater treatment process based on reverse osmosis membrane - Google Patents
Wastewater treatment process based on reverse osmosis membrane Download PDFInfo
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- CN116143308A CN116143308A CN202111245228.3A CN202111245228A CN116143308A CN 116143308 A CN116143308 A CN 116143308A CN 202111245228 A CN202111245228 A CN 202111245228A CN 116143308 A CN116143308 A CN 116143308A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/08—Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/58—Multistep processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- 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
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- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2303/04—Disinfection
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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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
- C02F3/30—Aerobic and anaerobic processes
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a wastewater treatment process based on a reverse osmosis membrane, which comprises the following steps of: (1) The wastewater in the sewage tank is subjected to flocculation precipitation in sequence through a flocculation tank, fine particulate impurities are removed through uniform aeration of the air floatation tank, and anaerobic and aerobic treatments are carried out through a degradation tank so as to effectively remove organic matters in the water; (2) The degraded water enters an ultrafiltration membrane filter device, particles with molecular weight more than 500 and particle diameter more than 10nm are filtered by the ultrafiltration membrane filter device, and then the water enters an adjusting tank for water quality adjustment; (3) The water adjusted by the adjusting tank is subjected to heat exchange and temperature rise by a heat exchanger and then enters a reverse osmosis system; filtering by a high-flux reverse osmosis membrane of a first-stage reverse osmosis unit and a second-stage reverse osmosis unit in sequence to obtain desalted water; (4) Then enters an ion exchange resin treatment unit for ion exchange, then is sterilized and disinfected by a purification unit, and then enters a pure water tank. The invention can convert sewage into a pure water source which is convenient for industrial application and the like, and has remarkable resource and environmental protection benefits.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a wastewater treatment process based on a reverse osmosis membrane.
Background
Water resources are an important basis for the development of socioeconomic performance and are also an important constituent of the ecological environment system. The reasonable configuration of water resources is not only related to the healthy development of economy, the stability and harmony of society, but also related to the balance and stability of ecological environment, and is an extremely important strategic problem. At present, wastewater is treated to solve the problems of water resource shortage, water pollution aggravation and water demand increase, so that the water sources become available resources, the requirements of people on fresh water are met, and the problems are to be solved urgently.
At present, the process technology related to wastewater treatment comprises an ion exchange resin technology, a membrane separation technology, an EDI technology and the like, but the technology has the characteristics, but has the defects that a large amount of waste acid and waste alkali liquid are easy to generate in the ion exchange resin technology to cause environmental pollution, the EDI technology has the problems of high cost, unstable effluent quality and the like, so that the technology is orderly and cooperatively matched for wastewater treatment to become a mainstream treatment technology.
Disclosure of Invention
Based on the technical problems, the invention provides a wastewater treatment process based on a reverse osmosis membrane.
The technical scheme adopted by the invention is as follows:
the wastewater treatment process based on the reverse osmosis membrane adopts a wastewater treatment device, the device comprises a wastewater pretreatment system and a membrane filtration system, the membrane filtration system comprises an ultrafiltration membrane filtration device and a reverse osmosis membrane filtration device, and the wastewater pretreatment system, the ultrafiltration membrane filtration device and the reverse osmosis membrane filtration device are sequentially connected;
the sewage pretreatment system comprises a flocculation tank, an air floatation tank and a degradation tank, wherein an inlet of the flocculation tank is communicated with the sewage tank through a first conveying pipeline, a flocculant adding pipeline is arranged above the flocculation tank, and an outlet of the flocculation tank is communicated with an inlet of the air floatation tank through a second conveying pipeline; an aeration pipeline is arranged at the bottom of the air floatation tank, the aeration pipeline is communicated with the gas conveying pipeline, and an outlet of the air floatation tank is communicated with the degradation tank through a third conveying pipeline; the inside of the degradation tank is provided with biological filler, and the outlet of the degradation tank is connected with the inlet of the ultrafiltration membrane filtering device through a fourth conveying pipeline;
the outlet of the ultrafiltration membrane filtering device is connected with the inlet of the regulating tank through a fifth conveying pipeline, an adjusting material adding pipeline is arranged above the regulating tank, the outlet of the regulating tank is connected with the tube side inlet of the heat exchanger through a sixth conveying pipeline, the tube side outlet of the heat exchanger is connected with the liquid inlet of the first-stage reverse osmosis unit through a seventh conveying pipeline, the clear liquid outlet of the first-stage reverse osmosis unit is connected with the liquid inlet of the second-stage reverse osmosis unit through an eighth conveying pipeline, and high-flux reverse osmosis membranes are arranged in the first-stage reverse osmosis unit and the second-stage reverse osmosis unit; the wastewater treatment process comprises the following steps:
(1) Wastewater in the sewage tank enters a flocculation tank through a first conveying pipeline, a flocculating agent is added into the flocculation tank through a flocculating agent adding pipeline, and sewage is subjected to flocculation precipitation in the flocculation tank; the water after flocculation precipitation in the flocculation tank enters the air floatation tank through a second conveying pipeline, and is uniformly aerated in the air floatation tank through an aeration pipeline; the fine particulate impurities in the water are effectively removed through a flocculation tank and an air floatation tank; the water treated by the air floatation tank enters a degradation tank through a third conveying pipeline, and is subjected to anaerobic and aerobic treatment in the degradation tank so as to effectively remove organic matters in the water;
(2) The degraded water enters an ultrafiltration membrane filter device through a fourth conveying pipeline, particles with molecular weight more than 500 and particle diameter more than 10nm are filtered by the ultrafiltration membrane filter device, and the water filtered by the ultrafiltration membrane filter device enters an adjusting tank through a fifth conveying pipeline; adding a regulating material into the regulating tank through a regulating material adding pipeline so as to regulate the water quality in the regulating tank;
(3) The water adjusted by the adjusting tank is subjected to heat exchange and temperature rise by a heat exchanger and then enters a reverse osmosis system; and filtering by a high-flux reverse osmosis membrane of the first-stage reverse osmosis unit and the second-stage reverse osmosis unit in sequence to obtain desalted water.
Preferably, the clear liquid outlet of the second-stage reverse osmosis unit is connected with the inlet of the ion exchange resin treatment unit through a ninth conveying pipeline, the outlet of the ion exchange resin treatment unit is connected with the inlet of the purification unit through a tenth conveying pipeline, and the outlet of the purification unit is connected with the pure water tank;
and (3) conveying desalted water in the step (3) to an ion exchange resin treatment unit through a ninth conveying pipeline, performing full ion exchange with the ion exchange resin, and then entering a purification unit, and performing sterilization, disinfection and purification to obtain a purer water source.
Preferably, the sewage tank is divided into a sewage storage area and a sewage pre-filtering area, a deoiling felt is arranged above the sewage pre-filtering area, a screen for filtering solid waste residues is arranged at the outlet of the sewage pre-filtering area, and the outlet of the sewage pre-filtering area is connected with a first conveying pipeline;
before the sewage enters the flocculation tank, the sewage enters a sewage prefiltering area, oil in the water is removed through a felt in the sewage prefiltering area, and the larger-particle solid waste residues are removed through filtering of a screen.
Preferably, the degradation pool is divided into an anaerobic degradation pool and an aerobic degradation pool which are communicated with each other, a plurality of partition boards are arranged in the anaerobic degradation pool and the aerobic degradation pool, and adjacent partition boards are arranged in parallel and staggered;
after entering the degradation pool, the water passes through the filler in the anaerobic degradation pool and the aerobic degradation pool in an S-shaped trend so as to fully degrade organic matters in the water.
Preferably, the reverse osmosis membrane system is also connected with a back flushing device, the back flushing device comprises a back flushing water pipeline and a filter, and the back flushing water pipeline comprises a first back flushing water input pipeline, a first back flushing water discharge pipeline, a second back flushing water input pipeline and a second back flushing water discharge pipeline;
the first backwash water input pipeline is communicated with a reverse osmosis water inlet of the second-stage reverse osmosis unit, a reverse osmosis water outlet of the second-stage reverse osmosis unit is connected with one end of a first backwash water discharge pipeline, the other end of the first backwash water discharge pipeline is connected with a water inlet of a filter, a water outlet of the filter is connected with one end of a second backwash water input pipeline, the other end of the second backwash water input pipeline is connected with a reverse osmosis water inlet of the first-stage reverse osmosis unit, and a reverse osmosis water outlet of the first-stage reverse osmosis unit is connected with the second backwash water discharge pipeline;
the high-flux reverse osmosis membranes in the primary reverse osmosis unit and the secondary reverse osmosis unit are regularly backwashed and cleaned through a backwashing device, and the specific process is as follows:
the backwash water firstly enters the second-stage reverse osmosis unit through a first backwash water input pipeline, backwash cleaning is carried out on a high-flux reverse osmosis membrane in the second-stage reverse osmosis unit, and then enters the filter through a first backwash water discharge pipeline;
the back flush water filtered by the filter enters the first-stage reverse osmosis unit through the second back flush water input pipeline, back flush cleaning is carried out on the high-flux reverse osmosis membrane in the first-stage reverse osmosis unit, and then the back flush water is discharged through the second back flush water discharge pipeline.
Preferably, the first backwash water input pipeline is also connected with a sodium hypochlorite solution adding pipeline;
sodium hypochlorite solution is added into the backwash water through a sodium hypochlorite solution adding pipeline so as to inhibit bacteria breeding in the membrane assembly.
Preferably, the ninth conveying pipeline is further connected with an ammonia-containing solution adding pipeline;
and adding the ammonia-containing solution into the ninth conveying pipeline through the ammonia-containing solution adding pipeline so as to eliminate CO2 and acidic substances in water conveyed by the ninth conveying pipeline.
The beneficial technical effects of the invention are as follows:
the invention combines the sewage pretreatment process and the membrane filtration process, and can convert sewage into desalted water which is convenient for industrial application, thereby a large amount of waste water resources are utilized, the resources and the environmental protection benefit are obvious, and the process has the advantages of high desalination rate, stable effluent quality, long service life and the like.
In addition, the technology of the invention further combines a reverse osmosis membrane technology and an ion exchange technology, and the pretreatment technology before the treatment of the ion exchange resin is used for the filtration of the pre-ultrafiltration membrane and the treatment of the two-stage reverse osmosis unit, thereby not only ensuring the stable quality of effluent water and prolonging the service life of the resin, but also being more environment-friendly.
In the later stage of the treatment process, the ion exchange resin treatment unit, the purification unit, the sterilization treatment and the like can obtain a purer water source, the additional value is higher, and the application range is wider.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the construction principle of the wastewater treatment device according to the present invention;
FIG. 3 is a schematic diagram of a degradation tank in a wastewater treatment apparatus according to the present invention.
Detailed Description
With reference to the attached drawings, the wastewater treatment process based on the reverse osmosis membrane adopts a wastewater treatment device, the device comprises a wastewater pretreatment system and a membrane filtration system, wherein the membrane filtration system comprises an ultrafiltration membrane filtration device 1 and a reverse osmosis membrane filtration device, and the wastewater pretreatment system, the ultrafiltration membrane filtration device and the reverse osmosis membrane filtration device are sequentially connected. The sewage pretreatment system comprises a flocculation tank 2, an air floatation tank 3 and a degradation tank 4, wherein an inlet of the flocculation tank 2 is communicated with a sewage tank 6 through a first conveying pipeline 5, and a flocculant adding pipeline 33 is arranged above the flocculation tank 2. The outlet of the flocculation tank 2 is communicated with the inlet of the floatation tank 3 through a second conveying pipeline 7. An aeration pipeline is arranged at the bottom of the air floatation tank 3, the aeration pipeline is communicated with a gas conveying pipeline 8, and an outlet of the air floatation tank is communicated with the degradation tank 4 through a third conveying pipeline 9. The inside of the degradation tank 4 is provided with biological filler 10, and the outlet of the degradation tank 4 is connected with the inlet of the ultrafiltration membrane filtration device 1 through a fourth conveying pipeline 11. The outlet of the ultrafiltration membrane filtering device 1 is connected with the inlet of the regulating tank 13 through a fifth conveying pipeline 12, an adjusting material adding pipeline is arranged above the regulating tank 13, the outlet of the regulating tank is connected with the tube side inlet of the heat exchanger 15 through a sixth conveying pipeline 14, and the tube side outlet of the heat exchanger 15 is connected with the liquid inlet of the first-stage reverse osmosis unit 17 through a seventh conveying pipeline 16. The clear liquid outlet of the first-stage reverse osmosis unit 17 is connected with the liquid inlet of the second-stage reverse osmosis unit 19 through an eighth conveying pipeline 18, and high-flux reverse osmosis membranes are arranged in the first-stage reverse osmosis unit 17 and the second-stage reverse osmosis unit 19. The wastewater treatment process comprises the following steps:
(1) The wastewater in the sewage tank 6 enters the flocculation tank 2 through the first conveying pipeline 5, a flocculating agent is added into the flocculation tank through a flocculating agent adding pipeline 33, and the sewage is subjected to flocculation precipitation in the flocculation tank 2. The water after flocculation precipitation in the flocculation tank enters the air floatation tank 3 through a second conveying pipeline 7, and is uniformly aerated in the air floatation tank 3 through an aeration pipeline. The fine particulate impurities in the water are effectively removed through the flocculation tank 2 and the floatation tank 3. The water treated by the air floatation tank 3 enters the degradation tank 4 through a third conveying pipeline 9, and is subjected to anaerobic and aerobic treatment in the degradation tank 4 so as to effectively remove organic matters in the water.
(2) The degraded water enters the ultrafiltration membrane filtration device 1 through the fourth conveying pipeline 11, particles with the molecular weight more than 500 and the particle diameter more than 10nm are filtered by the ultrafiltration membrane filtration device, and the water filtered by the ultrafiltration membrane filtration device enters the regulating tank 13 through the fifth conveying pipeline 12. And adding a regulating material into the regulating tank through a regulating material adding pipeline so as to regulate the water quality in the regulating tank.
(3) The water adjusted by the adjusting tank 13 enters a reverse osmosis system after heat exchange and temperature rise of the heat exchanger 15; the desalted water is obtained by high flux reverse osmosis membrane filtration of the first stage reverse osmosis unit 17 and the second stage reverse osmosis unit 19 in sequence.
The invention combines the sewage pretreatment process and the membrane filtration process, and can convert sewage into desalted water which is convenient for industrial application, thereby a large amount of waste water resources are utilized, the resources and the environmental protection benefit are obvious, and the process has the advantages of high desalination rate, stable effluent quality, long service life and the like.
As a further design of the invention, the clear liquid outlet of the secondary reverse osmosis unit 19 is connected with the inlet of the ion exchange resin treatment unit 21 through a ninth conveying pipeline 20, the outlet of the ion exchange resin treatment unit 21 is connected with the inlet of the purification unit 23 through a tenth conveying pipeline 22, and the outlet of the purification unit 23 is connected with the pure water tank 24. The ion exchange resin treatment unit 21 employs sodium ion exchange resin. The purifying unit 23 adopts an ozone sterilizing device or an ultraviolet sterilizing device.
The desalted water in the step (3) is conveyed to an ion exchange resin treatment unit 21 through a ninth conveying pipeline 20, fully ion-exchanged with the ion exchange resin, then enters a purification unit 23 through a tenth conveying pipeline 22, and is sterilized, disinfected and purified through an ozone sterilization device or an ultraviolet sterilization device, so that a purer water source is obtained.
The process further combines a reverse osmosis membrane technology and an ion exchange technology, and uses the pre-ultrafiltration membrane filtration and the two-stage reverse osmosis unit treatment as a pretreatment process before the ion exchange resin treatment, so that the effluent quality can be ensured to be stable, the service life of the resin is prolonged, and the process is more environment-friendly. In the later stage of the treatment process, the ion exchange resin treatment unit, the purification unit, the sterilization treatment and the like can obtain a purer water source, the additional value is higher, and the application range is wider.
Still further, the inside of effluent water sump 6 is provided with the partition wall, and this partition wall divides into sewage storage area and sewage prefiltering area with the effluent water sump, is provided with the deoiling felt in the top of sewage prefiltering area, is provided with the screen cloth that is used for filtering solid waste in the exit of sewage prefiltering area, and the exit linkage of sewage prefiltering area is first pipeline 5. Through the separated sewage prefiltering area, oil stains in the sewage before entering the flocculation tank can be removed by adopting felt removal adsorption, and solid particles of waste residues in the sewage are removed in the past.
Further, the degradation tank 4 is divided into an anaerobic degradation tank 401 and an aerobic degradation tank 402 which are communicated with each other, a plurality of partition plates 403 are arranged in the anaerobic degradation tank and the aerobic degradation tank, and adjacent partition plates are arranged in parallel and staggered mode. Through the arrangement mode of the partition boards, after water enters the degradation tank, the water passes through the filler in the anaerobic degradation tank and the aerobic degradation tank in an S-shaped trend so as to fully degrade organic matters in the water. The water flow passing through the anaerobic degradation tank and the aerobic degradation tank is in an S-shaped trend and passes through the filler, so that good anaerobic and aerobic treatment effects are achieved, and organic matters and the like in the water are effectively removed.
The ultrafiltration membrane filter device is a membrane filter device for filtering out particles with molecular weight more than 500 and particle diameter more than 10 nm.
The above-mentioned adjusting material adding pipe includes a reducing agent adding pipe 34, a scale inhibitor adding pipe 35 and an acid solution adding pipe 36, which are respectively used for adding a reducing agent for neutralization to the regulating tank when needed, a scale inhibitor for preventing scaling in the subsequent reverse osmosis membrane treatment, and an acid solution for adjusting the pH value in the regulating tank.
Further, the concentrate outlet of the second stage reverse osmosis unit is communicated with the liquid inlet of the first stage reverse osmosis unit 17 through an eleventh conveying pipeline 25. The first-stage reverse osmosis unit is also provided with a concentrated solution outlet. The structure setting mode can concentrate the liquid, so that the waste of water resources is effectively avoided.
Further, the reverse osmosis membrane system is also connected with a back flushing device, and the back flushing device comprises a back flushing water pipeline and a filter 30, wherein the back flushing water pipeline comprises a first back flushing water input pipeline 26, a first back flushing water discharge pipeline 27, a second back flushing water input pipeline 28 and a second back flushing water discharge pipeline 29. The first backwash water input pipeline 26 is communicated with a reverse osmosis water inlet of the second-stage reverse osmosis unit 19, a reverse osmosis water outlet of the second-stage reverse osmosis unit 19 is connected with one end of a first backwash water discharge pipeline 27, the other end of the first backwash water discharge pipeline 27 is connected with a water inlet of a filter 30, a water outlet of the filter 30 is connected with one end of a second backwash water input pipeline 28, the other end of the second backwash water input pipeline 28 is connected with a reverse osmosis water inlet of the first-stage reverse osmosis unit 17, and a reverse osmosis water outlet of the first-stage reverse osmosis unit is connected with a second backwash water discharge pipeline 29.
The high-flux reverse osmosis membranes in the primary reverse osmosis unit 17 and the secondary reverse osmosis unit 19 are regularly backwashed and cleaned through a backwashing device, and the specific process is as follows:
the backwash water firstly enters the secondary reverse osmosis unit 19 through the first backwash water input pipeline 26, backwash cleaning is carried out on the high flux reverse osmosis membrane in the secondary reverse osmosis unit 19, and then enters the filter 30 through the first backwash water discharge pipeline 27. The back-flushing water filtered by the filter 30 enters the first-stage reverse osmosis unit 17 through the second back-flushing water input pipeline 28, back-flushing cleaning is performed on the high-flux reverse osmosis membrane in the first-stage reverse osmosis unit 17, and then the back-flushing water is discharged through the second back-flushing water discharge pipeline 29. The two-stage reverse osmosis unit is connected with the back flushing device in a matched manner to perform regular back flushing cleaning, so that the performance of the high-flux reverse osmosis membrane is ensured to be maintained, the service life is prolonged, and the desalination rate is further improved.
Further, the first backwash water input pipe is also connected to a sodium hypochlorite solution adding pipe 31. Sodium hypochlorite solution is added to the backwash water through sodium hypochlorite solution addition pipe 31 to inhibit bacterial growth in the membrane module.
Further, the ninth delivery line 20 is also connected to an ammonia-containing solution adding line 32. An ammonia-containing solution is added to the ninth transport pipe 20 through an ammonia-containing solution adding pipe 32 to eliminate CO2 and acidic substances in the water that later enters the ion exchange resin treatment unit 21.
The parts not described in the above modes can be realized by adopting or referring to the prior art.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The wastewater treatment process based on the reverse osmosis membrane is characterized by adopting a wastewater treatment device, wherein the device comprises a wastewater pretreatment system and a membrane filtration system, the membrane filtration system comprises an ultrafiltration membrane filtration device and a reverse osmosis membrane filtration device, and the wastewater pretreatment system, the ultrafiltration membrane filtration device and the reverse osmosis membrane filtration device are sequentially connected;
the sewage pretreatment system comprises a flocculation tank, an air floatation tank and a degradation tank, wherein an inlet of the flocculation tank is communicated with the sewage tank through a first conveying pipeline, a flocculant adding pipeline is arranged above the flocculation tank, and an outlet of the flocculation tank is communicated with an inlet of the air floatation tank through a second conveying pipeline; an aeration pipeline is arranged at the bottom of the air floatation tank, the aeration pipeline is communicated with the gas conveying pipeline, and an outlet of the air floatation tank is communicated with the degradation tank through a third conveying pipeline; the inside of the degradation tank is provided with biological filler, and the outlet of the degradation tank is connected with the inlet of the ultrafiltration membrane filtering device through a fourth conveying pipeline;
the outlet of the ultrafiltration membrane filtering device is connected with the inlet of the regulating tank through a fifth conveying pipeline, an adjusting material adding pipeline is arranged above the regulating tank, the outlet of the regulating tank is connected with the tube side inlet of the heat exchanger through a sixth conveying pipeline, the tube side outlet of the heat exchanger is connected with the liquid inlet of the first-stage reverse osmosis unit through a seventh conveying pipeline, the clear liquid outlet of the first-stage reverse osmosis unit is connected with the liquid inlet of the second-stage reverse osmosis unit through an eighth conveying pipeline, and high-flux reverse osmosis membranes are arranged in the first-stage reverse osmosis unit and the second-stage reverse osmosis unit; the wastewater treatment process comprises the following steps:
(1) Wastewater in the sewage tank enters a flocculation tank through a first conveying pipeline, a flocculating agent is added into the flocculation tank through a flocculating agent adding pipeline, and sewage is subjected to flocculation precipitation in the flocculation tank; the water after flocculation precipitation in the flocculation tank enters the air floatation tank through a second conveying pipeline, and is uniformly aerated in the air floatation tank through an aeration pipeline; the fine particulate impurities in the water are effectively removed through a flocculation tank and an air floatation tank; the water treated by the air floatation tank enters a degradation tank through a third conveying pipeline, and is subjected to anaerobic and aerobic treatment in the degradation tank so as to effectively remove organic matters in the water;
(2) The degraded water enters an ultrafiltration membrane filter device through a fourth conveying pipeline, particles with molecular weight more than 500 and particle diameter more than 10nm are filtered by the ultrafiltration membrane filter device, and the water filtered by the ultrafiltration membrane filter device enters an adjusting tank through a fifth conveying pipeline; adding a regulating material into the regulating tank through a regulating material adding pipeline so as to regulate the water quality in the regulating tank;
(3) The water adjusted by the adjusting tank is subjected to heat exchange and temperature rise by a heat exchanger and then enters a reverse osmosis system; and filtering by a high-flux reverse osmosis membrane of the first-stage reverse osmosis unit and the second-stage reverse osmosis unit in sequence to obtain desalted water.
2. The reverse osmosis membrane-based wastewater treatment process according to claim 1, wherein: the clear liquid outlet of the second-stage reverse osmosis unit is connected with the inlet of the ion exchange resin treatment unit through a ninth conveying pipeline, the outlet of the ion exchange resin treatment unit is connected with the inlet of the purification unit through a tenth conveying pipeline, and the outlet of the purification unit is connected with the pure water tank;
and (3) conveying desalted water in the step (3) to an ion exchange resin treatment unit through a ninth conveying pipeline, performing full ion exchange with the ion exchange resin, and then entering a purification unit, and performing sterilization, disinfection and purification to obtain a purer water source.
3. The reverse osmosis membrane-based wastewater treatment process according to claim 1, wherein: the sewage pool is divided into a sewage storage area and a sewage pre-filtering area, a deoiling felt is arranged above the sewage pre-filtering area, a screen for filtering solid waste residues is arranged at the outlet of the sewage pre-filtering area, and the outlet of the sewage pre-filtering area is connected with a first conveying pipeline;
before the sewage enters the flocculation tank, the sewage enters a sewage prefiltering area, oil in the water is removed through a felt in the sewage prefiltering area, and the larger-particle solid waste residues are removed through filtering of a screen.
4. The reverse osmosis membrane-based wastewater treatment process according to claim 1, wherein: the degradation pool is divided into an anaerobic degradation pool and an aerobic degradation pool which are communicated with each other, a plurality of partition boards are arranged in the anaerobic degradation pool and the aerobic degradation pool, and adjacent partition boards are arranged in parallel and staggered mode;
after entering the degradation pool, the water passes through the filler in the anaerobic degradation pool and the aerobic degradation pool in an S-shaped trend so as to fully degrade organic matters in the water.
5. The reverse osmosis membrane-based wastewater treatment process according to claim 1, wherein: the reverse osmosis membrane system is also connected with a back flushing device, the back flushing device comprises a back flushing water pipeline and a filter, and the back flushing water pipeline comprises a first back flushing water input pipeline, a first back flushing water discharge pipeline, a second back flushing water input pipeline and a second back flushing water discharge pipeline;
the first backwash water input pipeline is communicated with a reverse osmosis water inlet of the second-stage reverse osmosis unit, a reverse osmosis water outlet of the second-stage reverse osmosis unit is connected with one end of a first backwash water discharge pipeline, the other end of the first backwash water discharge pipeline is connected with a water inlet of a filter, a water outlet of the filter is connected with one end of a second backwash water input pipeline, the other end of the second backwash water input pipeline is connected with a reverse osmosis water inlet of the first-stage reverse osmosis unit, and a reverse osmosis water outlet of the first-stage reverse osmosis unit is connected with the second backwash water discharge pipeline;
the high-flux reverse osmosis membranes in the primary reverse osmosis unit and the secondary reverse osmosis unit are regularly backwashed and cleaned through a backwashing device, and the specific process is as follows:
the backwash water firstly enters the second-stage reverse osmosis unit through a first backwash water input pipeline, backwash cleaning is carried out on a high-flux reverse osmosis membrane in the second-stage reverse osmosis unit, and then enters the filter through a first backwash water discharge pipeline;
the back flush water filtered by the filter enters the first-stage reverse osmosis unit through the second back flush water input pipeline, back flush cleaning is carried out on the high-flux reverse osmosis membrane in the first-stage reverse osmosis unit, and then the back flush water is discharged through the second back flush water discharge pipeline.
6. The reverse osmosis membrane-based wastewater treatment process according to claim 5, wherein: the first backwash water input pipeline is also connected with a sodium hypochlorite solution adding pipeline;
sodium hypochlorite solution is added into the backwash water through a sodium hypochlorite solution adding pipeline so as to inhibit bacteria breeding in the membrane assembly.
7. A reverse osmosis membrane based wastewater treatment process according to claim 2, wherein: the ninth conveying pipeline is also connected with an ammonia-containing solution adding pipeline;
and adding the ammonia-containing solution into the ninth conveying pipeline through the ammonia-containing solution adding pipeline so as to eliminate CO2 and acidic substances in water conveyed by the ninth conveying pipeline.
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| CN118561350A (en) * | 2024-06-12 | 2024-08-30 | 彰华(南京)工业水处理有限公司 | RO reverse osmosis sewage treatment equipment and treatment method |
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| CN118561350A (en) * | 2024-06-12 | 2024-08-30 | 彰华(南京)工业水处理有限公司 | RO reverse osmosis sewage treatment equipment and treatment method |
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