CN104192947B - A kind of method suppressing membrane component fouling during brackish water desalination - Google Patents
A kind of method suppressing membrane component fouling during brackish water desalination Download PDFInfo
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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
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Abstract
A kind of method suppressing membrane component fouling during the invention discloses brackish water desalination, technical scheme main points are: reach critical scaling condition in monitoring latter end putamina respectively by self adaptive ex situ inorganic scale monitoring device and scaling prediction device at dense water side form element face with predicting and inorganic scaling phenomenon occur at latter end dense water side form element face, realize the reverse of water inlet fluid, destroy the concentration boundary layer that membrane component surface is formed, and then the surface scale of suppression membrane component, increase the response rate producing water to greatest extent.
Description
Technical field
The invention belongs to technique of desalinating saline water field, a kind of method suppressing membrane component fouling during being specifically related to brackish water desalination.
Background technology
The acquisition of freshwater resources is a great environmental and the existence problem of facing mankind, and each state all takes much count of the technical research to this respect and input.In global water balance, underground bitter content accounts for more than half of groundwater resources amount, and this kind of unconventional water resource is increasingly considered in the near future, is a kind of potential important and alternative drinking water source.Common brackish water desalination technique includes: reverse osmosis, nanofiltration, just permeate and electrodialysis, these membrane separating process are using operation barometric gradient as driving force, be not accompanied by the change of a large amount of heat energy, have energy-conservation, can operate continuously and be easy to the features such as automatization, therefore suffer from more and more favoring.At present, most commonly seen with bitter reverse osmosis desalination technology in industrial application.
Generally during reverse osmosis brackish water desalination, membrane component is vulnerable to the pollution of some pollutant in feedwater and causes separating property to decline and running cost raising.Bitter takes from Deep Underground more, through hypermedia filtration (chiltern, clay and rock etc.), many particulate matters in feedwater and some Organic substances are removed, and along with the progress of membrane pretreatment technology, colloid, suspended solid and most microorganism relatively efficiently can be removed by ultrafilter membrane, and Organic substance particularly larger molecular organics can be retained by ultrafilter membrane major part.It addition, it is main by monovalence Na in total dissolved solidss salinity in sea water+And Cl−Constitute, and bitter always dissolves in solid solution salinity and is typically by bivalence incrustation ion Ca2+、CO3 2 −And SO4 2 −Constitute.In reverse osmosis brackish water desalination technique, the enrichment factor of dissolubility inorganic salt is typically between 4-10.Therefore, the puzzlement that during reverse osmosis brackish water desalination, most probable runs into is face inorganic scaling, and inorganic scaling is to affect embrane method brackish water desalination to produce Water Sproading rate and the main factor of desalinating cost.Therefore, increase during research and development brackish water desalination and produce Water Sproading rate and the new technology of suppression face inorganic scaling, have great importance for product water cost is greatly lowered.
The patent of Publication No. US 5690829 discloses a kind of counter-current process, for cleaning the dirt particle of face.After using counter-current operation, after the water outlet section of the latter end membrane module that dirt particle accumulation is the most serious obtains the physics flushing action of former water, the preposition conventional pretreatment unit in membrane separation assemblies can be exempted, thus decrease the floor space of system process and make water cost.The shortcoming of this technology is not account for into the complexity of water composition and different pollutant at the specific Causes for Pollution of face, does not the most also account for cleaning face dirt particle and starting the accurate critical condition of counter-current process.The patent of Publication No. CN 101053776A discloses the changing flow direction method of blocking reverse osmosis membrane fouling in the presence of a kind of antisludging agent, if Heavenly Stems and Earthly Branches putamina is together in series composition reverse osmosis units.In counter-infiltration system running, in the time interval less than film induction period of scaling, alternately change the former water flow direction in film unit, the high concentration boundary region set up on film surface is destroyed with this, extend induction period of scaling, thus suppress reverse osmosis membrane fouling, by the infiltration coefficient of last putamina of monitoring calculation, and then obtain the retarding degree to film fouling.The shortcoming of this technology is not account for the absolute existence of concentration polarization phenomenon in reverse-osmosis membrane element running, have ignored the scaling tendency difference at membrane component two ends bulk solution and face, and produce discharge using film or infiltration coefficient decline characterizes reverse osmosis membrane fouling as monitoring means, the fouling membrane including inorganic pollution, organic contamination, microorganism pollution and colloidal solid pollute and the concept of face inorganic scaling are obscured, so that result of calculation lacks tight science.It addition, the essential step adding antisludging agent adds pretreating process and environmental pollution cost.
The patent of Publication No. CN 102294174A, CN 102712512A, CN 101754934A individually discloses curing reverse osmosis membrane chemical cleaning method, reduces film scale formation in various degree；For improving membrane filtration system, the method that particularly permeability in water or waste water treatment process and the method for flux and compositions reach to control film fouling；Membrane bioreactor system regulates various process variable for the method controlling film filter fouling.These methods are the purpose reaching to suppress reverse osmosis face inorganic scaling by changing operating parameter and increase Chemical cleaning.
Summary of the invention
The present invention solves in existing embrane method brackish water desalination technique, increase and highlight the problem of the reverse osmosis face fouling faced when producing Water Sproading rate and provide a kind of suppress membrane component fouling during brackish water desalination method.
A kind of method suppressing membrane component fouling during the technical scheme is that brackish water desalination, it is characterised in that comprise the following steps:
(1) the former water of bitter is after multi-medium filtering or membrane pretreatment, enters film desalting plant inlet water tank after reaching the requirement of product water water quality SDI15≤3.0 and turbidity≤0.01NTU；
null(2) 3-12 is propped up putamina be together in series composition multistage reverse osmosis module，The import and export two ends of every putamina are separately installed with retaining ring and are fixed in putamina by membrane component，Wherein membrane component is reverse osmosis membrane or NF membrane，The tapered arrangement of multistage reverse osmosis module，Dense water in the head and the tail section putamina of multistage reverse osmosis module is sequentially connected to reverse osmosis high-pressure pump by valve respectively、Cartridge filter、Booster pump and film desalting plant inlet water tank，And the dense water in the head and the tail section putamina of multistage reverse osmosis module imports reverse osmosis concentrated water discharge passage by valve respectively，This reverse osmosis concentrated water discharge passage is connected by valve respectively and has self adaptive ex situ inorganic scale monitoring device and scaling prediction device，The most self adaptive ex situ inorganic scale monitoring device is made up of the plate and frame RO membrane cisterna that specification is 7.5cm × 2.5cm × 2.7mm；
(3) the penetrating fluid pipeline of each putamina in multistage reverse osmosis module is coupled together, import embrane method brackish water desalination system and produce aquaporin, and eventually enter into desalination water tank；
(4) running system, start reverse osmosis high-pressure pump, former water by forward flow, i.e. flows into from first putamina in multistage reverse osmosis module, flows out from last putamina, and penetrating fluid enters desalination water tank, and dense water rinses for the physics of pretreatment unit；
null(5) at water side form element face dense in self adaptive ex situ inorganic scale monitoring device and scaling prediction device monitor last putamina respectively, reach critical scaling condition and predict when inorganic scaling occurring at latter end dense water side form element face，Start water inlet fluid reverse phase，Former water is made to change the flow direction in multistage reverse osmosis module by reverse flow，The most former water flows into from last putamina，Flow out from first putamina，Penetrating fluid enters desalination water tank，Dense water rinses for the physics of pretreatment unit，The process that realizes of the most self adaptive ex situ inorganic scale monitoring device and scaling prediction device was respectively as follows: every 5 minutes，Use scanning electron microscope-energy dispersion spectrum that the mineral crystal on film surface in plate and frame RO membrane cisterna is carried out pattern respectively、Qualitative and quantitative analysis，Accurately determine whether that face fouling occurs，After starting fluid reverse phase of periodically intaking，Still by plate and frame RO membrane cisterna, the inorganic scaling at water side form face dense in first putamina can be realized self adaptive monitoring；At intervals of two minutes, it is calculated as incrustation ion activity according to plate and frame RO membrane cisterna water inlet composition, theoretical in conjunction with concentration polarization, predict that at dense water side form face, whether fouling occurs, when bright lattice rel index LSI or Si Difudaiwei index of stability S&DSI at dense water side form face is more than zero, or when predicting the difficulty soluble salt degree of supersaturation index SI at dense water side form face more than 1 based on Pitzer Theory of Electrolyte Solution, show that critical scaling condition occurs；
(6) at dense water side form element face in fluid reverse phase of intaking runs and monitors first putamina respectively to self adaptive ex situ inorganic scale monitoring device and scaling prediction device, reach critical scaling condition and predict when inorganic scaling occurring at latter end dense water side form element face, be again started up periodically intaking fluid reverse phase, destroy the concentration boundary layer that membrane component surface is formed, and then the surface scale of suppression membrane component, increase the response rate producing water to greatest extent.
Reverse osmosis membrane of the present invention or NF membrane are commercial diameter 8 inches, 4 inches or the membrane component of 2.5 inches, and the type of inorganic scaling is CaCO on reverse osmosis membrane or NF membrane dense water side or face3、CaSO4、BaSO4、SrSO4、Ca3(PO4)2, metal-oxide or silicon deposits inorganic salt precipitation.
The operation temperature of multistage reverse osmosis module of the present invention is 0-60 DEG C.
The present invention is compared with prior art, there is following clear superiority: one is based on the face inorganic scaling problem the most easily run into during embrane method brackish water desalination, by using the monitoring of self adaptive ex situ inorganic scale and Forecasting Methodology, the degree of depth to couple self adaptive water inlet fluid reverse phase, the system that achieves is produced more than Water Sproading rate >=85% without fouling risk, reduce further product water cost, make system produce Water Sproading rate and improve more than 10% than conventional art；Two is to be flowed to by the water inlet periodically changing in multistage reverse osmosis module, make that membrane component fouling potential maximum is self adaptive to be exposed in the water inlet solution environmental of saturated mode far away, promote the inorganic scale may having been formed on latter end dense water side or face to dissolve；Three allow for the concentration polarization phenomenon in coiled reverse osmosis membrane element or NF membrane element running and thus cause the concentration difference at the bulk solution of both sides, boundary region and face, thus increase the science of face scaling prediction；Four is to compose as detection method to characterize the scale formation of reverse osmosis membrane and NF membrane using scanning electron microscope and energy dispersion, improves the accuracy of membrane component face inorganic scaling monitoring；Five is to be respectively adopted the Forecasting Methodology of inorganic scale at self adaptive ex situ inorganic scale monitoring technology and the dense water side of film based on high concentration electrolyte theory and face, expand the critical condition that water inlet fluid reverse phase periodically starts further, inhibit the potential of face inorganic scaling to the full extent.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Drawing illustrates: 1, film desalting plant inlet water tank, 2, booster pump, 3, cartridge filter, 4, reverse osmosis high-pressure pump, 5, feed water by reverse osmosis valve, 6, multistage reverse osmosis module, 7, reverse osmosis produced water valve, 8, reverse osmosis concentrated water valve, 9, latter end membrane component face scaling prediction device water intaking valve, 10, scaling prediction device, 11, latter end membrane component face self adaptive ex situ inorganic scale monitoring device water intaking valve, 12, self adaptive ex situ inorganic scale monitoring device, 13, reverse osmosis concentrated water discharging valve, 14, water inlet fluid reverses pattern feed water by reverse osmosis valve, 15, water inlet fluid reverses the reverse osmosis concentrated water valve of pattern.
Detailed description of the invention
Being described in further details the foregoing of the present invention by the following examples, but this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to below example, all technology realized based on foregoing of the present invention belong to the scope of the present invention.
This device is understood mainly by film desalting plant inlet water tank 1 in conjunction with accompanying drawing 1, booster pump 2, cartridge filter 3, reverse osmosis high-pressure pump 4, feed water by reverse osmosis valve 5, multistage reverse osmosis module 6, reverse osmosis produced water valve 7, reverse osmosis concentrated water valve 8, latter end membrane component face scaling prediction device water intaking valve 9, scaling prediction device 10, latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11, self adaptive ex situ inorganic scale monitoring device 12, reverse osmosis concentrated water discharging valve 13, water inlet fluid reverses pattern feed water by reverse osmosis valve 14 and water inlet fluid reverses the reverse osmosis concentrated water valve of pattern 15 and is formed by connecting.nullIn above-mentioned technique，The outlet of film desalting plant inlet water tank 1 is connected with the water inlet of booster pump 2，The outlet of booster pump 2 is connected with the water inlet of cartridge filter 3，The outlet of cartridge filter 3 is connected with the water inlet of reverse osmosis high-pressure pump 4，The water inlet that the outlet of reverse osmosis high-pressure pump 4 reverses pattern feed water by reverse osmosis valve 14 with feed water by reverse osmosis valve 5 and water inlet fluid respectively by three-way valve is connected，The outlet of feed water by reverse osmosis valve 5 is connected with the water inlet of multistage reverse osmosis module 6，The penetrating fluid of multistage reverse osmosis module 6 is connected with the water inlet of reverse osmosis produced water valve 7，The dense water of multistage reverse osmosis module 6 is connected with reverse osmosis concentrated water valve 8 water inlet，The outlet of reverse osmosis concentrated water valve 8 by cross valve respectively with latter end membrane component face scaling prediction device water intaking valve 9、The water inlet of latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 and reverse osmosis concentrated water discharging valve 13 connects，The outlet of latter end membrane component face scaling prediction device water intaking valve 9 is connected with the water inlet of scaling prediction device 10，The outlet of latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 is connected with the water inlet of self adaptive ex situ inorganic scale monitoring device 12，Water inlet fluid reverses the water inlet of the reverse osmosis concentrated water valve of pattern 15 and is connected with the water inlet of multistage reverse osmosis module 6，Water inlet fluid reverse the reverse osmosis concentrated water valve of pattern 15 outlet by cross valve respectively with latter end membrane component face scaling prediction device water intaking valve 9、The water inlet of latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 and reverse osmosis concentrated water discharging valve 13 connects.nullWhen starting normal feed water flow gymnastics operation mode，Open feed water by reverse osmosis valve 5、Reverse osmosis produced water valve 7、Reverse osmosis concentrated water valve 8、Latter end membrane component face scaling prediction device water intaking valve 9、Latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 and reverse osmosis concentrated water discharging valve 13，Close water inlet fluid reverse pattern feed water by reverse osmosis valve 14 and water inlet fluid reverses the reverse osmosis concentrated water valve of pattern 15，When starting water inlet fluid and reversing operator scheme，Open and reverse pattern feed water by reverse osmosis valve 14 into water fluid、Reverse osmosis produced water valve 7、Water inlet fluid reverses the reverse osmosis concentrated water valve of pattern 15、Latter end membrane component face scaling prediction device water intaking valve 9、Latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 and reverse osmosis concentrated water discharging valve 13，Close feed water by reverse osmosis valve 5 and reverse osmosis concentrated water valve 8.
Embodiment 1
Select bitter be salinity be 0.5-3.0g L−1Underground brackish water, concrete steps include: start booster pump 2, raw water pump in film desalting plant inlet water tank 1 is entered cartridge filter 3, security personnel's filter produces water and enters reverse osmosis high-pressure pump 4, opening feed water by reverse osmosis valve 5, simultaneously close off and reverse pattern feed water by reverse osmosis valve 14 into water fluid, the outlet of feed water by reverse osmosis valve 5 is connected with the water inlet of multistage reverse osmosis module 6, keeping feed water by reverse osmosis pressure is 4.5MPa, and feed water by reverse osmosis flow is 1000L h-1Constant, multistage reverse osmosis module 6 is to the Ca in bitter2+、Mg2+、SO4 2−、HCO3 −, the rejection of TDS and total hardness be respectively 99%, 99.2%, 99.4%, 95%, 99.2% and 99.4%, reverse osmosis list prop up putamina in membrane component pressure drop less than 0.1MPa.Opening reverse osmosis produced water valve 7, collect the product water of multistage reverse osmosis module 6, system produces Water Sproading rate >=88%, treats post processing.Above one section of reverse osmosis concentrated water sequentially enters next section of reverse osmosis module, opens reverse osmosis concentrated water valve 8 and reverse osmosis concentrated water discharging valve 13 respectively, by the reverse osmosis concentrated water of drain valve for intaking the backwash water of pretreatment stage membrane component；Opening latter end membrane component face scaling prediction device water intaking valve 9, latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11, in multistage reverse osmosis module, a small amount of dense water of latter end respectively enters scaling prediction device 10 and self adaptive ex situ inorganic scale monitoring monitoring device 12 simultaneously.
nullWhether it is more than zero according to the bright lattice rel index at dense water side form face or Si Difudaiwei index of stability，Or whether predict the difficulty soluble salt degree of supersaturation index at dense water side form face more than 1 based on Pitzer Theory of Electrolyte Solution，At dense water side or face, inorganic scaling occurs when latter end membrane component scaling prediction device 10 predicts、Or according to scanning electron microscope-energy dispersion spectrum, the mineral crystal on film surface in plate and frame RO membrane cisterna is carried out pattern respectively、Qualitative and quantitative analysis，Accurately determine whether that face fouling occurs，When self adaptive ex situ inorganic scale monitoring device 12 detect at face, inorganic scale occurs time，I.e. start water inlet fluid reverse phase，Open successively and reverse pattern feed water by reverse osmosis valve 14 into water fluid、Reverse osmosis produced water valve 7、Water inlet fluid reverses the reverse osmosis concentrated water valve of pattern 15、Latter end membrane component face scaling prediction device water intaking valve 9、Latter end membrane component self adaptive ex situ inorganic scale detection device water intaking valve 11 and reverse osmosis concentrated water discharging valve 13，Close feed water by reverse osmosis valve 5 and reverse osmosis concentrated water valve 8.Forward flow becomes reverse flow, when latter end membrane component scaling prediction device 10 or self adaptive ex situ inorganic scale detection device 12 again predict or detect at face, inorganic scale occurs time, be again started up normal feed water flow gymnastics operation mode.So use and alternately change the operator scheme that the interior water inlet of membrane module flows to, destroy the concentration polarization layer set up at dense water side or face, suppress film fouling.With traditional water inlet fluid, without the prediction of self adaptive ex situ inorganic scale with without compared with monitoring technique, the system of present invention process produces Water Sproading rate higher than the latter more than 10%.
Embodiment 2
Keeping feed water by reverse osmosis pressure is 5.0MPa, and keeping reverse osmosis concentrated discharge is 800L h-1Constant, multistage reverse osmosis module 6 is to the Ca in bitter2+、Mg2+、SO4 2−、HCO3 −, the rejection of TDS and total hardness be respectively 98.8%, 99.1 %, 99.3%, 94.7%, 99% and 99.3%, reverse osmosis list prop up putamina in membrane component pressure drop less than 0.1Mpa, it is 85% that multistage reverse osmosis module 6 system under these experimental conditions produces Water Sproading rate.
This example demonstrates that, when reducing the reverse osmosis water outlet mouth terminal membrane tangential flow velocity in face, under the conditions of former current direction does not changes, each main incrustation ion Ca2+、Mg2+And SO4 2−Concentration polarization degree increase the weight of.When system product Water Sproading rate is 85%, Ca2+、Mg2+And SO4 2−The concentration polarization factor increased to 1.48,2.91 and 2.35 by 1.27 in embodiment 1,1.96 and 1.87 respectively, fouling is there is in advance at the face of membrane component, but use the method flowed to of intaking in changing multistage reverse osmosis module, still can suppress the fouling of membrane component significantly.
Embodiment above describes the ultimate principle of the present invention, principal character and advantage; skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and description; under the scope without departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements each fall within the scope of protection of the invention.
Claims (3)
1. the method suppressing membrane component fouling during a brackish water desalination, it is characterised in that comprise the following steps:
(1) salinity is 0.5-3.0g L− 1The former water of bitter after multi-medium filtering or membrane pretreatment, enter film desalting plant inlet water tank after reaching to produce the requirement of water water quality SDI15≤3.0 and turbidity≤0.01NTU；
null(2) 3-12 is propped up putamina be together in series composition multistage reverse osmosis module，The import and export two ends of every putamina are separately installed with retaining ring and are fixed in putamina by membrane component，Wherein membrane component is reverse osmosis membrane or NF membrane，The tapered arrangement of multistage reverse osmosis module，Dense water in the head and the tail section putamina of multistage reverse osmosis module is sequentially connected to reverse osmosis high-pressure pump by valve respectively、Cartridge filter、Booster pump and film desalting plant inlet water tank，And the dense water in the head and the tail section putamina of multistage reverse osmosis module imports reverse osmosis concentrated water discharge passage by valve respectively，This reverse osmosis concentrated water discharge passage is connected by valve respectively and has self adaptive ex situ inorganic scale monitoring device and scaling prediction device，The most self adaptive ex situ inorganic scale monitoring device is made up of the plate and frame RO membrane cisterna that specification is 7.5cm × 2.5cm × 2.7mm；
(3) the penetrating fluid pipeline of each putamina in multistage reverse osmosis module is coupled together, import embrane method brackish water desalination system and produce aquaporin, and eventually enter into desalination water tank；
(4) running system, start reverse osmosis high-pressure pump, former water by forward flow, i.e. flows into from first putamina in multistage reverse osmosis module, flows out from last putamina, and penetrating fluid enters desalination water tank, and dense water rinses for the physics of pretreatment unit；
null(5) at water side form element face dense in self adaptive ex situ inorganic scale monitoring device and scaling prediction device monitor last putamina respectively, reach critical scaling condition and predict when inorganic scaling occurring at latter end dense water side form element face，Start water inlet fluid reverse phase，Former water is made to change the flow direction in multistage reverse osmosis module by reverse flow，The most former water flows into from last putamina，Flow out from first putamina，Penetrating fluid enters desalination water tank，Dense water rinses for the physics of pretreatment unit，The process that realizes of the most self adaptive ex situ inorganic scale monitoring device and scaling prediction device was respectively as follows: every 5 minutes，Use scanning electron microscope-energy dispersion spectrum that the mineral crystal on film surface in plate and frame RO membrane cisterna is carried out pattern respectively、Qualitative and quantitative analysis，Accurately determine whether that face fouling occurs，After starting fluid reverse phase of periodically intaking，Still by plate and frame RO membrane cisterna, the inorganic scaling at water side form face dense in first putamina can be realized self adaptive monitoring；At intervals of two minutes, it is calculated as incrustation ion activity according to plate and frame RO membrane cisterna water inlet composition, theoretical in conjunction with concentration polarization, predict that at dense water side form face, whether fouling occurs, when bright lattice rel index LSI at dense water side form face is more than zero, or when predicting the difficulty soluble salt degree of supersaturation index SI at dense water side form face more than 1 based on Pitzer Theory of Electrolyte Solution, show that critical scaling condition occurs；
(6) at dense water side form element face in fluid reverse phase of intaking runs and monitors first putamina respectively to self adaptive ex situ inorganic scale monitoring device and scaling prediction device, reach critical scaling condition and predict when inorganic scaling occurring at latter end dense water side form element face, be again started up periodically intaking fluid reverse phase, destroy the concentration boundary layer that membrane component surface is formed, and then the surface scale of suppression membrane component, increase the response rate producing water to greatest extent, it is achieved that more than system product Water Sproading rate >=85% without face fouling risk.
The method suppressing membrane component fouling during brackish water desalination the most according to claim 1, it is characterized in that: described reverse osmosis membrane or NF membrane are commercial diameter 8 inches, 4 inches or the membrane component of 2.5 inches, the type of inorganic scaling is CaCO on reverse osmosis membrane or NF membrane dense water side or face3、CaSO4、BaSO4、SrSO4、Ca3(PO4)2, metal-oxide or silicon deposits inorganic salt precipitation.
The method suppressing membrane component fouling during brackish water desalination the most according to claim 1, it is characterised in that: the operation temperature of described multistage reverse osmosis module is 0-60 DEG C.
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| CN109381998A (en) * | 2017-08-09 | 2019-02-26 | 上海澄沥环保科技有限公司 | A kind of reverse osmosis nanofiltration processing technique |
| CN108067103A (en) * | 2017-12-29 | 2018-05-25 | 北京中科瑞升资源环境技术有限公司 | Doughnut tablet coupled film distillation equipment and use its membrane distillation system |
| CN118373492B (en) * | 2024-06-24 | 2024-08-27 | 南京顺水达环保科技有限公司 | Method and system for sterilizing and scale inhibiting of membrane shell based on high-frequency pulse |
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| CN100488608C (en) * | 2007-03-08 | 2009-05-20 | 上海交通大学 | Changing flow direction method for blocking reverse osmosis membrane scaling in the presence of the scale inhibitor |
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