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다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0895156 (2010-09-30) |
등록번호 | US-8287743 (2012-10-16) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 6 인용 특허 : 444 |
A method of cleaning a membrane surface immersed in a liquid medium with a fluid flow, including the steps of providing a randomly generated intermittent or pulsed fluid flow along the membrane surface to dislodge fouling materials therefrom. A membrane module is also disclosed comprising a pluralit
A method of cleaning a membrane surface immersed in a liquid medium with a fluid flow, including the steps of providing a randomly generated intermittent or pulsed fluid flow along the membrane surface to dislodge fouling materials therefrom. A membrane module is also disclosed comprising a plurality of porous membranes (6) or set of membrane modules (5) and a device (11) for providing a generally randomly generated, pulsed fluid flow such that, in use, said fluid flow moves past the surfaces of said membranes (6) to dislodge fouling materials therefrom.
1. A method of cleaning a membrane surface immersed in a liquid medium to dislodge fouling materials therefrom comprising: providing a fluid flow comprising a two phase gas/liquid fluid flow in the liquid medium; andpulsing the fluid flow to provide a pulsed fluid flow which is random in at least on
1. A method of cleaning a membrane surface immersed in a liquid medium to dislodge fouling materials therefrom comprising: providing a fluid flow comprising a two phase gas/liquid fluid flow in the liquid medium; andpulsing the fluid flow to provide a pulsed fluid flow which is random in at least one of magnitude, frequency and duration using a device supplied with a flow of pressurised gas that is essentially constant. 2. The method according to claim 1, wherein the flow comprises gas bubbles. 3. The method according to claim 1, wherein the method further includes providing an additional source of gas bubbles in the liquid medium. 4. A method of cleaning a membrane surface immersed in a liquid medium to dislodge fouling materials therefrom comprising: providing a fluid flow comprising a two-phase gas/liquid fluid flow in the liquid medium; andpulsing the fluid flow to provide a pulsed two-phase gas/liquid fluid flow which is random in at least one of magnitude, frequency and duration in conjunction with an essentially constant two-phase gas/liquid flow. 5. A membrane module comprising: a plurality of porous membranes; anda device that provides a pulsed fluid flow comprising a two phase gas/liquid flow which is random in at least one of magnitude, frequency and duration such that, in use, the pulsed fluid flow moves past the surfaces of the membranes to dislodge fouling materials therefrom, wherein the device comprises a gaslift pump fluidly connected to a source of pressurized gas and operative in response to the pressurized gas to store and intermittently release the pressurized gas and to gaslift quantities of a liquid from a reservoir of liquid to produce the pulsed two-phase gas/liquid flow. 6. The membrane module according to claim 5, wherein the gas flow comprises gas bubbles. 7. The membrane module according to claim 5, wherein the device that provides the pulsed fluid flow further comprises a distributor in fluid communication with the device and the pulsed fluid flow is distributed into the module through the distributor. 8. The membrane module according to claim 5, wherein the gaslift pump comprises: an inverted gas storage chamber for storing the gas provided by the source of pressurized gas and having a closed upper end and an open lower end positioned in the reservoir of liquid;a vertical riser tube located within the inverted gas storage chamber and having an inlet port in fluid communication with the reservoir of liquid and an outlet port in fluid communication with the membrane module, the vertical riser tube having an opening in fluid communication with the inverted gas storage chamber positioned for receiving the gas from the inverted gas storage chamber when a level of gas within the chamber reaches a predetermined level and for gaslifting the liquid through the vertical riser tube for discharge into the membrane module. 9. The membrane module according to claim 5, wherein the source of pressurized gas is provided by an external tank containing the pressurized gas, the tank being in fluid communication with the membrane module and having control means for providing randomly generated pulses of gas to the module to form a gas bubble flow for cleaning the surfaces of the membranes. 10. The membrane module according to claim 9, wherein the control means comprise a fluid flow control device positioned in a gas/liquid inlet to the membrane module and operable in dependence on the level of liquid in the inlet to provide gas from the external tank. 11. A membrane module comprising a plurality of porous hollow fiber membranes, the porous hollow fiber membranes being arranged in close proximity to one another and mounted to prevent excessive movement therebetween, the porous hollow fiber membranes being fixed at each end in a header, one header having one or more openings formed therein through which a generally random pulsed gas flow is introduced for cleaning the surfaces of the porous hollow fiber membranes, and a device connected in fluid communication with a fluid distributor to substantially uniformly distribute pulsed gas bubbles into the membrane module. 12. The membrane module according to claim 11, wherein the pulsed gas flow is in the form of gas bubbles. 13. The membrane module according to claim 11, wherein the pulsed gas flow includes a two phase gas/liquid flow. 14. The membrane module according to claim 13, wherein the pulsed two-phase gas/liquid flow is produced by the device provided with a supply of gas. 15. The membrane module according to claim 14, wherein the supply of gas is essentially constant. 16. A membrane bioreactor comprising a tank having means for the introduction of feed thereto, means for forming activated sludge within the tank, a membrane module comprising a plurality of porous hollow fiber membranes, the plurality of porous hollow fiber membranes being arranged in close proximity to one another and mounted to prevent excessive movement therebetween, the plurality of porous hollow fiber membranes being fixed at each end in a header, one header having one or more openings formed therein through which a generally random pulsed gas flow is introduced for cleaning the surfaces of the hollow fiber membranes, the membrane module positioned within the tank so as to be immersed in the activated sludge and the membrane module provided with means for withdrawing filtrate from at least one end of the porous hollow fiber membranes. 17. A method of operating a membrane bioreactor according to claim 16, the method comprising: introducing feed to the tank;applying a vacuum to the plurality of porous hollow fiber membranes to withdraw filtrate therefrom while providing the random pulsed gas flow through aeration openings within the module such that, in use, the random pulsed gas flow moves past the surfaces of the plurality of porous hollow fiber membranes to dislodge fouling materials therefrom. 18. The method of operating a membrane bioreactor according to claim 17, further comprising providing a further source of aeration within the tank. 19. The method of operating a membrane bioreactor according to claim 18, further comprising vertically suspending the membrane module within the tank and providing the further source of aeration beneath the suspended module. 20. The method of operating a membrane bioreactor according to claim 18, wherein the further source of aeration comprises a group of air permeable tubes. 21. A water treatment system comprising: a liquid reservoir fluidly connected to a source of water;a gas/liquid chamber enclosing a first compartment and a second compartment, the first compartment fluidly connected to the liquid reservoir; anda membrane module hydraulically connected to the second compartment. 22. The water treatment system according to claim 21, further comprising a chamber hydraulically isolated from the membrane module and a gas source connected to the chamber. 23. The water treatment system according to claim 21, wherein the membrane module is immersed in a mixed liquor contained in a membrane tank hydraulically connected to an aeration zone which is fluidly connected to the gas/liquid chamber. 24. A method of scouring a membrane module comprising: providing a chamber having a first compartment and a second compartment;establishing a hydraulic seal between the first compartment and the membrane module;at least partially filling the first compartment with a liquid; andintroducing a gas into the chamber. 25. The method of scouring a membrane module according to claim 24, the method further comprising: breaking the hydraulic seal to release at least a portion of the gas contained in the chamber to the membrane module; andre-establishing the hydraulic seal between the first compartment and the membrane module. 26. The method of scouring a membrane module according to claim 24, the method further comprising re-breaking and re-establishing the hydraulic seal to produce a pulsed release of at least a portion of the gas contained in the chamber. 27. The method of scouring a membrane module according to claim 24, the method further comprising introducing liquid into the second compartment. 28. The method of scouring a membrane module according to claim 24, wherein the introduction of the gas into the chamber is performed essentially continuously.
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