WO2019116073A1 - Méthode et appareil de nettoyage de membrane - Google Patents

Méthode et appareil de nettoyage de membrane Download PDF

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Publication number
WO2019116073A1
WO2019116073A1 PCT/IB2017/057788 IB2017057788W WO2019116073A1 WO 2019116073 A1 WO2019116073 A1 WO 2019116073A1 IB 2017057788 W IB2017057788 W IB 2017057788W WO 2019116073 A1 WO2019116073 A1 WO 2019116073A1
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WO
WIPO (PCT)
Prior art keywords
permeate
membrane
valve
water
port
Prior art date
Application number
PCT/IB2017/057788
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English (en)
Inventor
Boris Liberman
Original Assignee
I.D.E. Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by I.D.E. Technologies Ltd filed Critical I.D.E. Technologies Ltd
Priority to PCT/IB2017/057788 priority Critical patent/WO2019116073A1/fr
Publication of WO2019116073A1 publication Critical patent/WO2019116073A1/fr

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Classifications

    • 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
    • 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
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/18—Specific valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/06—Use of osmotic pressure, e.g. direct osmosis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/12—Spiral-wound membrane modules comprising multiple spiral-wound assemblies
    • 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

Definitions

  • This invention relates to an improved method and apparatus for cleaning fouled membranes, in particular reverse osmosis (RO) membranes in desalination and water treatment plants.
  • RO reverse osmosis
  • the method of RO is an effective and energy-saving method of desalination which is widely employed for obtaining water for industrial use, for agriculture, potable water and ultrapure water.
  • the method consists in applying mechanical (gauge) pressure over a saline solution (such as sea water), which is higher than the osmotic pressure of the same solution, in a volume delimited by a semi-permeable membrane (RO membrane).
  • the solvent is squeezed through the membrane to its‘permeate’ side while dissolved salts remain in solution at the‘feed’ side of the membrane.
  • osmotic pressures of solutions are referenced to pure solvent, i.e. if a given saline water solution has an osmotic pressure PO, this means that pure water from the other side of an osmotic membrane will permeate towards this solution as if under gauge pressure PO.
  • a more effective method of cleaning is by using direct osmosis wherein saline solution is fed to the fouled feed side of the RO while supplying solvent (water) to the permeate side of the membrane.
  • the higher osmotic pressure at the feed side sucks water from the permeate side to the feed side of the RO membrane whereby the water penetrates into the interface between the membrane and the accumulated foulant and separates the foulant from the membrane surface.
  • the saline solution may be provided to the feed side without pressure and the water is supplied to the permeate side without pressure resulting in cleaning water being sucked back to the feed side as a result of the net differential pressure between the two osmotic pressures. However, this may result in remote areas of the membrane not being cleaned.
  • a RO membrane is typically a tight multi-layered structure with very narrow passages where water flows very slowly. Some areas of the membrane are close to the channel supplying water while other areas are remote. The high net differential between sea water and water leads to a very fast back-suction of water from the permeate side to the feed side causing water to not reach remote areas of the membrane while the concentration at both side of the membrane in close areas soon becoming equalised, stopping the cleaning process.
  • US 2007/0246425 A1 describes an improved direct osmosis cleaning method and system that provides a pressurized source of dilute saline solution and a pressurized source of saline solution.
  • a plurality of RO modules are provided and connected in parallel and the system includes a source of raw solution with a high pressure feed pump, a common high- pressure raw solution feed line connecting front end ports of the modules to the source of raw solution, a common high pressure brine collection line connecting the rear end brine ports of the modules to a first brine discharge outlet and a common permeate collection line connecting the permeate ports of the modules to a product storage tank or next stage separator.
  • a plurality of valves are provided adapted to open or close the ports and common lines so as to allow performance of the normal separation process and the cleaning method on each RO module in turn.
  • the cleaning method comprises feeding dilute saline solution to the permeate side of the RO membrane under gauge pressure (PD4) and osmotic pressure (P04), feeding concentrated saline solution to the feed side of the RO membrane under gauge pressure (PC5) and osmotic pressure (P05) and withdrawing the concentrated saline solution together with the separated foulant and the penetrated water from the feed side of the RO membrane.
  • PD4 permeate side of the RO membrane under gauge pressure
  • P04 osmotic pressure
  • PC5 feed side of the RO membrane under gauge pressure
  • P05 osmotic pressure
  • This aforementioned method and system does enhance the cleaning of the membrane by allowing all parts of the membrane to be reached and enables cleaning to occur in particular modules of the desalination plant while other modules continue to operate.
  • the implementation of the process requires high pressure pipes and valves which is costly and increases the footprint of the plant.
  • NF nanofiltration
  • PRO pressure-retarded osmosis
  • FO forward osmosis
  • It is an object of the present invention is to provide an improved method for cleaning a fouled membrane, particularly but not exclusively a RO membrane, that aims to overcome, or at least alleviate, the abovementioned drawbacks. It is a further object of the present invention to provide an improved system for cleaning fouled membranes, particularly not exclusively RO membranes, that aims to overcome, or at least alleviate, the abovementioned drawbacks.
  • a first aspect of the present invention provides a cleaning system for cleaning semi- permeable membranes, for example cleaning a RO membrane in a desalination plant, the system comprising a plurality of modules each module comprising a pressure vessel housing at least one semi-permeable membrane, said membrane having a feed side and an opposite permeate side and extending between a front end and a rear end of the vessel, the vessel having a front end feed port and a rear-end brine port in communication with the feed side of the membrane, at least one permeate port in communication with said permeate side of the membrane, wherein each module has a normal separation mode and a cleaning mode wherein in the normal separation mode feed water passes from the feed side to the permeate side to provide residual brine water from the rear-end brine port and permeate water from said permeate port and in the cleaning mode washing water is delivered from an external source to the permeate side under higher pressure than the permeate pressure during the normal separation process, the higher permeate pressure causing a change in the net driving
  • all of the valves that are responsible for providing the change in direction of the flow of fluid across the or each membrane are provided within the vessel itself.
  • the cleaning system is particularly suitable for cleaning RO membranes.
  • the feed water comprises seawater, generally having a salinity of around 3.6%.
  • the residual brine water is sea water that is concentrated in the normal separation process to a higher salinity.
  • the permeate water is the product water in the normal separation process, having a lower salinity than the feed water.
  • the washing water is provided from an external source and has a similar salinity to the permeate water.
  • each permeate port is provided with the internal valve, each valve being independently operable and configured to allow permeate water to flow out of the port during the separation mode, at least one of the permeate ports allowing permeate washing water to flow in to the vessel through the port during the cleaning mode.
  • the washing water may be provided to a front end, rear end or both ends of the vessel during the cleaning mode but permeate is prevented from leaving the permeate side of the membrane in this mode.
  • the invention provides internal valves within the pressure vessel itself for switching the direction of the flow of fluid across the membrane thereby removing the need for external valves and piping that must be able to withstand high pressures.
  • the front end of the vessel houses an adapter with internal valves, the valves being configured to allow feed water to enter the feed side of the membrane in the separation mode and to allow washing water to enter the permeate side of the membrane in the cleaning mode.
  • the rear end of the vessel may also be provided with an internal valve, the valve being configured to allow permeate water to exit the permeate port in the separation mode and to prevent permeate water from exiting the permeate port in the cleaning mode.
  • the front end valve and rear end valve are connected by a command pipe extending through the pressure vessel whereby operation of one valve causes operation of the other valve. More preferably, the command pipe and valves are configured to effect closure of the rear end valve to prevent permeate water exiting the permeate port upon opening of the front end valve to the washing water.
  • the internal valves are preferably provided in an adapter at one or both ends of the pressure vessel.
  • the front end valve may comprise an inlet adapter for the washing water inlet for controlling entry of permeate water into the permeate side of the membrane and a main body, a pipe connected to the main body, an elastic tube inwardly of the main body, a sealing stand and membrane adapter.
  • the rear end valve may comprise an outlet adapter and a main body, spring, shaft and seal.
  • a second aspect of the present invention provides a method for cleaning a fouled semi- permeable membrane in a module, such as cleaning a RO membrane used for RO separation, said module comprising a pressure vessel housing at least one semi-permeable membrane, said membrane having a feed side and an opposite permeate side and extending between a front end and a rear end of the vessel, the vessel having a front end feed port and a rear-end brine port in communication with the feed side of the membrane and at least one permeate port in communication with the said permeate side of the membrane, the method of cleaning comprising changing from a normal separation process through the membrane wherein feed water passes from the feed side to the permeate side to provide residual brine water from the rear-end brine port and a permeate water from said permeate port to a cleaning process wherein washing water is delivered from an external source to the permeate side under higher pressure than the permeate pressure during the normal separation process, the higher permeate pressure causing a change in the net driving differential pressure across each membrane in,
  • the method may further comprise operating a front end valve provided in the front end of the pressure vessel wherein in the normal separation mode the valve is shut but in the cleaning mode the valve is opened to allow entry of washing water from an external source into the permeate side of the membrane.
  • the method may comprise operating a front end valve provided in the front end of the
  • the valve allows entry of washing water from an external source into the permeate side of the membrane.
  • the method further comprises operating a rear end valve provided in the rear end of the pressure vessel wherein in the normal separation mode the valve allows permeate to exit the permeate port and in the cleaning mode the valve prevents exit of the permeate water through the permeate port.
  • the rear end valve may also allow entry of washing water from an external source into the permeate side of the membrane during the cleaning mode.
  • opening of the front end valve to washing water causes closing of the rear end valve to the exit of permeate water.
  • Figure 1 is a schematic diagram of a prior art reverse osmosis train equipped with a direct osmosis cleaning system
  • Figure 2A illustrates the normal desalination process through cross-section A-A of Figure 1 at the beginning of a pressure vessel
  • Figure 2B illustrates the normal desalination process through cross-section B-B of Figure 1 towards the end of a pressure vessel
  • Figure 3 is a schematic diagram of an internal valve for a permeate port of a pressure vessel according to an embodiment of the invention, shown in the RO separation mode;
  • Figure 4 shows the internal valve of Figure 3 in the cleaning mode;
  • Figure 5 is a cross-sectional view of a main adapter for an end of a pressure vessel according to the prior art
  • Figure 6 illustrates separately a front end internal valve adapter and a rear end internal valve adapter, together with their positioning when installed in a pressure vessel, according to an embodiment of the present invention
  • Figure 7 is a cross-sectional view of the front end internal valve adapter shown in Figure 6;
  • Figure 8 is a cross-sectional view of the rear end internal valve adapter shown in Figure 7;
  • Figure 9 is a schematic cross-sectional view of the components of Figure 6 illustrating the arrangement of a command tube in relation to the internal valves;
  • Figure 10 illustrates operation of the apparatus shown in Figure 6 during the RO separation mode;
  • Figure 1 1 illustrates operation of the front end valve of Figure 6 during the RO separation mode
  • Figures 12A to 12C are expanded views of components of the front end valve during the RO separation mode
  • Figure 13A illustrates operation of the rear end valve of Figure 6 during the RO separation mode
  • Figure 13B is a cross-sectional view of a main body of the rear end valve of Figure 13A;
  • Figure 13C illustrates clean pressure force P L and the spring force F s during operation of the rear end valve in the RO separation mode
  • Figure 14 illustrates operation of the apparatus shown in Figure 6 during its cleaning mode
  • Figure 15A illustrates operation of the front end valve of Figure 6 during the cleaning mode
  • Figures 15B to 15C are expanded views of components of the front end valve during the cleaning mode;
  • Figure 16A illustrates operation of the rear end valve of Figure 6 during the cleaning mode;
  • Figure 16B is a cross-sectional view of a main body of the rear end valve of Figure 16A.
  • Figure 16C illustrates washing pressure force P H and the spring force F s during operation of the rear end valve in the cleaning mode
  • the present invention relates to an improved method and system for cleaning fouled membranes, in particular reverse osmosis (RO) membranes in desalination and water treatment plants.
  • RO reverse osmosis
  • the method and system is also applicable to other osmostic driven processes across a semipermeable membrane, such as nanofiltration, pressure retarded osmosis and forward osmosis processes used in various industries, such as desalination, water treatment, food production and chemical processing.
  • the crux of the invention is the ability to allow permeate water (“product water”) to flow out from the permeate side of the membrane during the normal separation process and, during the cleaning mode of the pressure vessel, close or lock the permeate outflow flow before it leaves a pressure vessel while allowing permeate water (“washing water”) from an external source to be delivered to the permeate side of the membrane.
  • product water permeate water
  • washing water permeate water
  • FIG. 1 of the accompanying drawings illustrates a conventional reverse osmosis train equipped with a direct osmosis cleaning system according to the prior art.
  • the illustrated system is shown carrying out the normal desalination process.
  • the system includes a high pressure pump 1 , connected by pipes to a series of pressure vessels 2, 4, 6, 8, 10 each containing a reverse osmosis membrane 3. Waste brine recovered from the feed side of the vessels is fed to a pelton turbine 15 for energy recovery.
  • Permeate ports from the permeate side of each membrane are connected to a series of pipes with valves V 15 V 2 provided in permeate manifolds.
  • Valves Vi are open during normal operation of the system and valves V 2 are closed to enable the removal of product (permeate) from the permeate side of the membranes for delivery to the client.
  • a further pressure vessel 20 acts as a permeate injector of permeate water (“washing water”) from an external source and is only operational during the direct osmosis cleaning phase.
  • the pressure vessel has a piston 22 but no membrane and is connected at one end to the high pressure feed by valves V 2 and at the other end to the permeate manifolds by valves V 3 . This pressure vessel is full of permeate but is isolated from the rest of the system during the normal desalination process by valves V 2 being shut.
  • FIGS. 2A and 2B illustrate the flow of fluid through the membranes, demonstrating the respective gauge and osmostic pressures of the fluids that provide a net driving force through the membrane.
  • the feed stream is at -65 bar gauge pressure and the osmostic pressure of the sea water is -33 bar.
  • the permeate stream is -1 bar gauge pressure and the osmotic pressure of the permeate is -0.3 bar. This provides a net driving force for desalination of -31 .3 bar.
  • Foulants 30 are deposited on the feed side of the membrane during flow of fluid from the feed to the permeate side of the membrane.
  • Direct osmosis cleaning of the foulant deposited on the membrane is carried out by shutting off valves ⁇ L and opening valves V 2 and V 3 so that feed is directed onto the piston 22 so that permeate water (“washing water”) is fed under pressure back through the permeate manifolds into the permeate side of each pressure vessel.
  • This causes the flow of fluid through the membrane to reverse and the passage of fluid from the permeate side to the feed side serves to lift foulant 30 from the membrane 3 which is then removed from the vessels prior to reversal of the process back to the normal desalination process by the closing of valves V 2 and opening of valves ⁇ .
  • FIGs 3 and 4 of the accompanying drawings illustrate schematically one embodiment of the present invention in which the valves for enabling reversal of the permeate flow are provided within each pressure vessel.
  • Figure 3 illustrates a permeate port in the form of a main adapter 40 provided with valve 42.
  • permeate is able to flow out of the pressure vessel 2 during normal operation of the reverse osmosis desalination system.
  • the valve 42 is shut off to prevent flow from the vessel but opens to allow permeate to flow into the permeate side of the vessel.
  • the ability to provide valves within the high pressure vessel removes the need to have valves outside of the vessel with associated pipework that must be able to withstand high pressures. While flow of fluid across the membrane of each pressure vessel to be independently reversed to allow for cleaning of the membrane without the need for external high pressure pipework and valves.
  • other designs of valve within the vessel pressure may be utilised.
  • the permeate pressurization device is composed of two valves 50, 60 located at each end of a standard RO membrane pressure vessel 2, as shown in Figure 6.
  • Figure 5 illustrates an end section of a standard membrane pressure vessel which is modified by placing a valve 50 or 60 in place of the adapter 70.
  • the permeate pressurization device has a front valve 50 provided at the feed inlet end of the vessel and a rear valve 60 provided at the permeate outlet end of a pressure vessel.
  • Front valve 50 serves to selectively open/close a permeate outlet and a washing water (permeate or other water source) inlet, as explained in further detail below.
  • Rear valve 60 selectively opens and closes permeate outlet only.
  • FIG. 7 is a front valve section illustrating the components of the front valve 50.
  • the valve is provided in main adapter 40 and includes an inlet adapter 51 for the washing water inlet connected to a pipe 52 connected to the main body 53 of the valve. Inwardly of the body is an elastic tube 54, sealing stand 55 and membrane adapter 56. A smaller diameter metal command pipe extends from the membrane adapter through the pressure vessel 2.
  • FIG 8 is a rear valve section illustrating the components of the rear valve 60.
  • the rear valve is again provided in a main adapter 40 and the valve includes an adapter 61 , main body 62, spring 63, shaft 64 and seal 65.
  • the smaller command pipe 80 that extends from the front valve 50 serves to connect the two valves 50, 60 as shown in Figure 9, enabling the front valve 50 to command the rear valve 60.
  • FIGS 10 to 13C illustrate operation of the valves 50, 60 during a normal RO desalination process.
  • Feed water FS enters the inlet 12 to the pressure vessel 2 at high pressure and passes across the membrane 3 to provide a brine stream BS and a permeate stream PS.
  • the brine stream BS exits through a brine water outlet 14 and the permeate stream PS exits at low pressure through front and rear outlets 16, 17 via the valves 50, 60, in a flow rate of around 20% through the front valve and 80% through the rear valve (as indicated by direction of arrows in Figure 10).
  • FIGs 1 1 to 12C illustrate the operation of the front valve 50 in further detail during this normal operational procedure.
  • the front permeate flow through the valve is indicated by the arrows with the front permeate flowing through the membrane adapter 56 into the elastic tube 54, squeezing the tube radially (see Figure 12C).
  • the front permeate passes the sealing stand 55 and goes inside it through holes 55a (see Figure 12B).
  • the permeate stream then flows throw holes 53a in the main body 53 (see Figure 12A) and around the sealing stand 55 and goes inside it through holes 55a (see Figure 12B).
  • the permeate stream then flows throw holes 53a in the main body 53 (see Figure 12A) and around the pipe 52 to exit the permeate outlet 16.
  • Port 58 connected to command pipe 80 is sealed to the front permeate.
  • FIGs 14 to 16C of the accompanying drawings illustrate operation of the valves 50, 60 during the direct osmotic cleaning (DOC) mode of the system.
  • High pressure washing water for delivery to the permeate side of the membrane 3 is introduced through a washing water inlet of adapter 51 and flows through the front valve 50. This water passes through the membrane 3 to the feed-brine side, thereby cleaning the membrane.
  • rear valve 60 must be shut, as detailed below.
  • Figures 15A to 15C illustrate operation of the front valve 50 in the DOC mode.
  • the high pressure washing water comes into the adapter through the inlet 51 and flows into the pipe 52 and main body 53 (see arrows on Figure 15A).
  • valves ⁇ L and V 2 of the prior art that are external to the vessel. This removes the need for valves and piping outside of the vessel that must be constructed of materials that can withstand high pressures and reduces the foot print of the apparatus.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un procédé et un système de nettoyage d'une membrane semi-perméable (3) dans un récipient sous pression (2) d'une installation de dessalement, ladite membrane ayant un côté alimentation (FS) et un côté de perméat opposé (PS) et s'étendant entre une extrémité avant et une extrémité arrière du récipient, un orifice d'alimentation d'extrémité avant (12) et un orifice de saumure d'extrémité arrière (14) en communication avec le côté alimentation de la membrane, au moins un orifice de perméat (16, 17) en communication avec ledit côté perméat de la membrane, chaque module ayant un mode de séparation normal et un mode de nettoyage dans lequel dans l'eau d'alimentation en mode de séparation normal passe du côté alimentation au côté perméat pour fournir de l'eau salée résiduelle (BS) à partir de l'orifice de saumure d'extrémité arrière et d'une eau de perméat provenant dudit orifice de perméat, et dans le mode de nettoyage, une eau de lavage est délivrée d'une source externe au côté perméat sous une pression supérieure à la pression de perméat pendant un processus de séparation normal de sorte que un différentiel d'entraînement de filet est dirigé vers le côté alimentation pour aspirer l'eau du côté perméat au côté alimentation de la membrane, ce qui permet de séparer l'agent d'encrassement de la membrane et de retirer la solution conjointement avec l'agent d'encrassement du côté alimentation de la membrane, chaque récipient étant pourvu d'au moins une soupape interne (50, 60) pouvant fonctionner sélectivement pour aider au moins partiellement à changer la direction d'écoulement de fluide à travers la membrane (3) pendant la commutation vers ou depuis le mode de séparation depuis ou vers le mode de nettoyage. A la fois l'extrémité avant et l'extrémité arrière du récipient peuvent avoir des soupapes internes (50, 60) pour effectuer un changement dans la direction d'écoulement de fluide à travers la membrane.
PCT/IB2017/057788 2017-12-11 2017-12-11 Méthode et appareil de nettoyage de membrane WO2019116073A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4961851A (en) * 1990-04-20 1990-10-09 Barbachano Fernando G R Self-cleaning reverse osmosis liquid treatment system, method and dual configuration check valve therefor
CN1686848A (zh) * 2005-04-29 2005-10-26 国家海洋局天津海水淡化与综合利用研究所 可在线反冲洗的反渗透脱盐系统
US20070246425A1 (en) 2003-01-09 2007-10-25 I.D.E. Technologies Ltd. Direct osmosis cleaning
US20130026090A1 (en) * 2011-07-28 2013-01-31 Johnson Jon E Spiral wound element and seal assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4961851A (en) * 1990-04-20 1990-10-09 Barbachano Fernando G R Self-cleaning reverse osmosis liquid treatment system, method and dual configuration check valve therefor
US20070246425A1 (en) 2003-01-09 2007-10-25 I.D.E. Technologies Ltd. Direct osmosis cleaning
CN1686848A (zh) * 2005-04-29 2005-10-26 国家海洋局天津海水淡化与综合利用研究所 可在线反冲洗的反渗透脱盐系统
US20130026090A1 (en) * 2011-07-28 2013-01-31 Johnson Jon E Spiral wound element and seal assembly

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