CN107032533A - A kind of integrated membrane process method for desalting seawater - Google Patents
A kind of integrated membrane process method for desalting seawater Download PDFInfo
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- CN107032533A CN107032533A CN201710460776.5A CN201710460776A CN107032533A CN 107032533 A CN107032533 A CN 107032533A CN 201710460776 A CN201710460776 A CN 201710460776A CN 107032533 A CN107032533 A CN 107032533A
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—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
-
- 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
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/04—Softening water by precipitation of the hardness using phosphates
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of integrated membrane process method for desalting seawater, step is：Seawater is filtered after being pressurized through raw water pump into external pressure type ultra-filtration membrane group；Ultrafiltration production water enters enters security personnel's filter filtering after booster pump is pressurized after ultrafiltration water producing tank, seawater after filtering is divided to two strands, one, which is added, enters NF membrane group after reducing agent and antisludging agent pressurize through one-level high-pressure pump, nanofiltration, which produces to enter after water pressurizes through two grades of high-pressure pumps, enters product water case after reverse osmosis membrane group；Another stock market water enters energy recycle device, high-energy nanofiltration concentrated water progress energy exchange with coming from NF membrane group, high-energy seawater after exchange enters back into NF membrane group, low energy concentrated water after exchange enters backwash water tank, and external pressure type ultra-filtration membrane group is backwashed through hyperfiltration reverse-rinsing pump after adding biocide.Present device cost of investment is low, and equipment pressure is low；Operating cost is low, ton water consumption≤2.1kW, compared with the 3.0kW tons of water consumption reductions by 30% of SWRO embrane methods 2.8.
Description
Technical field
The invention belongs to field of seawater desalination, more particularly to a kind of integrated membrane process method for desalting seawater.
Background technology
Shortage of water resources turns into global problem.New water source of fresh water is opened up using desalination technology, increases fresh water
Overall supplies, has been increasingly becoming a kind of important channel that countries in the world solve water crisis.
Existing method for desalting seawater mainly includes hot method, reverse osmosis membrane (SWRO).Embrane method market share in recent years
More and more higher, up to 70% share has been accounted in global newly-built seawater desalting plant.But, SWRO Membrane seawater desalinations have high behaviour
Make the common problems such as pressure, high energy consumption, the requirement of high material.
In recent years, some new low-cost desalination methods are reported both at home and abroad.Such as Chinese patent CN104291416A
A kind of electrodeionization desalting process is disclosed, by 35000mg/L desalinization to 500mg/L, system energy consumption
1.424kW/m3.But, product water quality can be lifted further, cost also has decline space.
United States Patent (USP) US2010/0089756A1 discloses " nanofiltration/ion exchange/electrodeionization " integrated membrane process seawater
Desalinating process.Raw water conductance 45.5mS/cm is desalinated to salt content 240mg/L, ton water consumption 1.85KW, compared with SWRO embrane method seawater
Desalination energy consumption, which has, significantly to be reduced.But, this process, which is used, needs consumption substantial amounts of in ion exchange resin, resin regeneration process
NaCl, and it is more intractable to regenerate high bisulfate waste liquor.In addition the seawater salt content of this method processing is about 32000mg/L, uses this method
When handling seawater salt content for 35000mg/L, its energy consumption continues to rise.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art there is provided a kind of inexpensive integrated membrane process desalinization side
Method.
Technical scheme is summarized as follows：
A kind of integrated membrane process method for desalting seawater, comprises the following steps：
(1) filtered after seawater is pressurized through raw water pump into external pressure type ultra-filtration membrane group；Ultrafiltration production water enters ultrafiltration and produces water
Case, ultrafiltration concentrated water discharge；
(2) ultrafiltration produces water after booster pump is pressurized into security personnel's filter filtering, and the seawater after filtering is divided to two strands, and one adds
Enter and enter NF membrane group after being pressurizeed after reducing agent and antisludging agent through one-level high-pressure pump, it is laggard through two grades of high-pressure pumps pressurizations that water is produced in nanofiltration
Enter reverse osmosis membrane group；Reverse osmosis produced water enters product water tank；Reverse osmosis concentrated water enters ultrafiltration water producing tank；Another stock market water enters energy
Retracting device is measured, the high-energy nanofiltration concentrated water progress energy exchange with coming from NF membrane group, the high-energy seawater after exchange is again
Into NF membrane group, the concentrated water that the low energy concentrated water after exchange enters in backwash water tank, backwash water tank adds biocide through ultrafiltration
Backwashing pump is backwashed to the pollutant of the film silk surface attachment of external pressure type ultra-filtration membrane group.
Preferably, the reducing agent is sodium hydrogensulfite, and the antisludging agent is calgon, the biocide or secondary chlorine
Sour sodium, chlorine dioxide or non-oxide biocide ACS.
Advantages of the present invention：
(1) equipment investment cost is reduced, and equipment pressure rating has compared with SWRO embrane methods to be reduced by a relatively large margin；
(2) operating cost is reduced, method ton water consumption≤2.1kW of the invention, compared with 2.8-3.0kW tons of water energy of SWRO embrane methods
Consumption reduction by 30%.
Brief description of the drawings
Fig. 1 is a kind of integrated membrane process desalination process schematic flow sheet.
In figure：1- raw water boxs；2- raw water pumps；3- external pressure type ultra-filtration membrane groups；4- ultrafiltration water producing tanks；5- booster pumps；6- ensures public security
Filter；7- one-level high-pressure pumps；8- energy recycle devices；9- NF membrane groups；Bis- grades of high-pressure pumps of 10-；11- reverse osmosis membrane groups；12- is produced
Product water tank；13- backwash water tanks；14- hyperfiltration reverse-rinsing pumps
Embodiment
With reference to specific embodiments and the drawings, the present invention is further illustrated.
A kind of integrated membrane process sea water desalinating unit, is shown in Fig. 1：
Raw water box 1 by pipeline successively with raw water pump 2, external pressure type ultra-filtration membrane group 3, ultrafiltration water producing tank 4, booster pump 5 and protect
Peace filter 6 is connected；Security personnel's filter 6 is connected with one-level high-pressure pump 7 and energy recycle device 8 respectively by pipeline, in security personnel's filter 6
Reducing agent throwing device and scale inhibitor feeding device are connected with pipeline between one-level high-pressure pump 7；One-level high-pressure pump 7 passes through
Pipeline is connected with NF membrane group 9, two grades of high-pressure pumps 10, reverse osmosis membrane group 11 and product water tank 12 successively；Energy recycle device 8 with
The seawater that high-energy is provided between NF membrane group 9 enters the concentrated water discharge pipe of pipe and high-energy, and energy recycle device 8 passes through pipe
Road is connected with backwash water tank 13, hyperfiltration reverse-rinsing pump 14 and external pressure type ultra-filtration membrane group 3 successively, in backwash water tank 13 and hyperfiltration reverse-rinsing pump
Biocide throwing device is provided with 14 connecting pipe.
Embodiment 1
A kind of integrated membrane process method for desalting seawater, comprises the following steps：
(1) filtered after seawater is pressurized through raw water pump into external pressure type ultra-filtration membrane group；Ultrafiltration production water enters ultrafiltration and produces water
Case, ultrafiltration concentrated water discharge；
(2) ultrafiltration produces water after booster pump is pressurized into security personnel's filter filtering, and the seawater after filtering is divided to two strands, and one adds
Enter and enter NF membrane group after being pressurizeed after reducing agent sodium hydrogensulfite and antisludging agent calgon through one-level high-pressure pump, nanofiltration production water
Enter reverse osmosis membrane group after two grades of high-pressure pump pressurizations；Reverse osmosis produced water enters product water tank；Reverse osmosis concentrated water is produced into ultrafiltration
Water tank；Another stock market water enters energy recycle device, the high-energy nanofiltration concentrated water progress energy exchange with coming from NF membrane group,
High-energy seawater after exchange enters back into NF membrane group, and the low energy concentrated water after exchange enters in backwash water tank, backwash water tank
Concentrated water adds biocide sodium hypochlorite and the pollutant of the film silk surface attachment of external pressure type ultra-filtration membrane group is carried out through hyperfiltration reverse-rinsing pump
Backwash.
Biocide can also select chlorine dioxide or non-oxide biocide ACS.
Seawater (TDS=35000mg/L) enters external pressure type ultra-filtration membrane group, flow of inlet water 2.33m after being lifted through raw water pump3/
H, using a Tao Shi SFP2860 membrane module, membrane flux is designed as 60L/m2H, ultrafiltration production water enters ultrafiltration water producing tank；
NF membrane group is using 12 Tao Shi NF90-4040 membrane components, 3 pressure vessels.System design is two sections of works of one-level
Skill, 2:4 NF membrane strings in 1 arrangement, i.e. 2 pressure vessels of first paragraph, one pressure vessel of second segment, every pressure vessel
Connection.
NF membrane group total inflow 2.66m3/ h, wherein into one-level high-pressure pump and each 1.33m of energy recycle device3/ h, receives
Filter production water-carrying capacity 1.33m3/ h, concentrated water flow 1.33m3/ h, this part concentrated water has higher energy, using energy regenerating to receiving
Filter concentrated water energy is recycled.The nano-filtration unit rate of recovery 50%, nanofiltration membrane flux 15.05L/m2h。
NF membrane group operational factor is shown in Table 1 with water quality parameter.
The NF membrane group operational factor of table 1 and water quality parameter
In embodiment, NF membrane group is operation bar that 35000mg/L seawater is 4.0MPa in operating pressure to water inlet TDS
Under part, nanofiltration production water TDS is 4932mg/L, salt rejection rate >=85%, Water Sproading rate 50%, ton water consumption 1.4kW/m3。
Reverse osmosis membrane group：Using 8 Tao Shi BW30-4040 membrane components, 2 pressure vessels.System design is two sections of one-level
4 reverse osmosis membrane series connection in technique, every pressure vessel.
Reverse osmosis membrane group flow of inlet water 1.33m3/ h, production water-carrying capacity 1m3/ h, concentrated water flow 0.33m3/ h, this part concentrated water water
It is of fine quality in seawater quality, be back to ultrafiltration water producing tank and reuse.The reverse osmosis units rate of recovery 75%, membrane flux 17.25L/
m2h。
Reverse osmosis membrane group operational factor is shown in Table 2 with water quality parameter.
The reverse osmosis membrane group operational factor of table 2 and water quality parameter
In embodiment, reverse osmosis membrane group is behaviour that 4932mg/L bitters are 1.4MPa in operating pressure to water inlet TDS
Under the conditions of work, reverse osmosis produced water TDS is 145.5mg/L, salt rejection rate 98%, Water Sproading rate 75%, ton water consumption 0.7kW/m3。
NF/BWRO integration technique of membrane is used for desalinization, and system salt rejection rate 99.5%, production water TDS is 145.5mg/L, is returned
Yield 43%, ton water consumption 2.1kW/m3(in terms of producing water).
Finally, it is necessary to which what is illustrated is：Listed above is only the specific embodiment of the present invention.It is clear that the invention is not restricted to
Above-described embodiment, can also there is multiple combinations form.Those skilled in the art can directly export from the disclosure
Or obtained change, it will be understood that within the scope of the present invention.
Claims (2)
1. a kind of integrated membrane process method for desalting seawater, it is characterised in that comprise the following steps：
(1) filtered after seawater is pressurized through raw water pump into external pressure type ultra-filtration membrane group；Ultrafiltration production water enters ultrafiltration water producing tank, surpasses
Filter concentrated water discharge；
(2) ultrafiltration produces water after booster pump is pressurized into security personnel's filter filtering, and the seawater after filtering is divided to two strands, and one is added also
Enter NF membrane group after being pressurizeed after former agent and antisludging agent through one-level high-pressure pump, nanofiltration produces water and enters anti-after two grades of high-pressure pump pressurizations
Permeable membrane group；Reverse osmosis produced water enters product water tank；Reverse osmosis concentrated water enters ultrafiltration water producing tank；Another stock market water is returned into energy
Receiving apparatus, the high-energy nanofiltration concentrated water progress energy exchange with coming from NF membrane group, the high-energy seawater after exchange is entered back into
NF membrane group, the low energy concentrated water after exchange enters anti-through ultrafiltration after the concentrated water addition biocide in backwash water tank, backwash water tank
Pump is washed to backwash the pollutant of the film silk surface attachment of external pressure type ultra-filtration membrane group.
2. according to the method described in claim 1, it is characterized in that the reducing agent is sodium hydrogensulfite, the antisludging agent is six inclined
Sodium phosphate, the biocide is sodium hypochlorite, chlorine dioxide or non-oxide biocide ACS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710460776.5A CN107032533A (en) | 2017-06-18 | 2017-06-18 | A kind of integrated membrane process method for desalting seawater |
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| CN201710460776.5A CN107032533A (en) | 2017-06-18 | 2017-06-18 | A kind of integrated membrane process method for desalting seawater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107651766A (en) * | 2017-08-29 | 2018-02-02 | 杭州上拓环境科技股份有限公司 | A kind of deep sea water simulation water quality is used for the method for deep-sea mariculture |
| CN108249643A (en) * | 2018-02-09 | 2018-07-06 | 山东奥美环境股份有限公司 | A kind of three embrane method seaweed processing waste water advanced treatment and reclamation methods and device |
| CN111204843A (en) * | 2020-01-09 | 2020-05-29 | 深圳市水视界环保科技有限公司 | Energy-saving water filtering system combining reverse osmosis membrane and nanofiltration membrane |
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| CN203976531U (en) * | 2014-06-12 | 2014-12-03 | 上海百菲特环保科技有限公司 | Sterilant chemicals dosing plant |
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2017
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| CN103623702A (en) * | 2009-05-15 | 2014-03-12 | 株式会社荏原制作所 | Seawater desalination system and energy exchange chamber |
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| EP2514721A1 (en) * | 2011-04-22 | 2012-10-24 | Ebara Corporation | Seawater desalination system and energy exchange chamber |
| CN103212300A (en) * | 2013-05-17 | 2013-07-24 | 中国海洋大学 | Cleaning method of ultrafiltration membrane in sea water desalination by whole membrane technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107651766A (en) * | 2017-08-29 | 2018-02-02 | 杭州上拓环境科技股份有限公司 | A kind of deep sea water simulation water quality is used for the method for deep-sea mariculture |
| CN108249643A (en) * | 2018-02-09 | 2018-07-06 | 山东奥美环境股份有限公司 | A kind of three embrane method seaweed processing waste water advanced treatment and reclamation methods and device |
| CN111204843A (en) * | 2020-01-09 | 2020-05-29 | 深圳市水视界环保科技有限公司 | Energy-saving water filtering system combining reverse osmosis membrane and nanofiltration membrane |
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