Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-061/18
B01D-063/02
출원번호
US-0977601
(1992-11-17)
발명자
/ 주소
Cote Pierre L. (Hamilto CAX) Smith Bradley M. (Mississauga CAX) Deutschmann Ake A. (Mississauga CAX) Rodrigues Carlos F. F. (Brampton CAX) Pedersen Steven K. (Burlington CAX)
출원인 / 주소
Zenon Environmental Inc. (Burlington CAX 03)
인용정보
피인용 횟수 :
167인용 특허 :
0
초록▼
A frameless array unconfined in a modular shell, proves to be a surprisingly effective membrane device for withdrawing permeate from a substrate, the flux through the membranes reaching an essentially constant relatively high value because of the critical deployment of fibers of the array as a skein
A frameless array unconfined in a modular shell, proves to be a surprisingly effective membrane device for withdrawing permeate from a substrate, the flux through the membranes reaching an essentially constant relatively high value because of the critical deployment of fibers of the array as a skein, arching in a buoyantly swayable generally parabolic configuration within the substrate, above at least one of the array\s headers in which the terminal end portions of the fibers are potted. The length of each fiber must be greater than the direct center-to-center distance between the array\s pair of headers. For use in a large reservoir, an assembly of the array and a gas distributor means has fibers preferably >0.5 meter long, which together provide a surface area >10 m2. The terminal end portions of fibers in each header are substantially free from fiber-to-fiber contact. When used in a tank from which the permeate is withdrawn at a location low enough to overcome the transmembrane pressure differential of the fibers, the permeate is withdrawn under a vacuum induced by gravity. To increase flux, a pump may be used which provides a suction less than 75 cm of Hg. When used in combination with a gas-distribution manifold disposed beneath the skein so as to flow bubbles through it, the surfaces of the fibers are surprisingly resistant to being fouled by build-up of deposits of inanimate particles or microorganisms in the substrate. Membranes with high transmembrane pressure differential may be used, if desired, and permeate removed with a vacuum pump.
대표청구항▼
A membrane device, for withdrawing permeate from a multicomponent liquid substrate, comprising, means for providing an alternative to a conventional module having plural individual arrays therewithin, including a frameless array of a multiplicity fiber membranes, or fibers, for operation without bei
A membrane device, for withdrawing permeate from a multicomponent liquid substrate, comprising, means for providing an alternative to a conventional module having plural individual arrays therewithin, including a frameless array of a multiplicity fiber membranes, or fibers, for operation without being supported except by said substrate, and without being confined in a shell of a module, said fibers together having a surface area >1 m2, said fibers being buoyantly swayable in said substrate, said fibers providing a transmembrane pressure differential in the range from about 0.7 kPa (0.1 psi) to about 345 kPa (50 psi), and each having a length >0.5 meter; a pair of first and second headers disposed in spaced-apart relationship within said substrate so that said fibers, when deployed, present an arcuate configuration above a horizontal plane through the horizontal center-line of a header; said first header having a terminal end portion of each fiber secured therein, and a second header having an opposed terminal end portion of each fiber secured therein, all said fibers extending from a face of each said header and essentially all said fibers being open at their ends so as to discharge said permeate through each of said headers; said fibers being sealingly secured with open ends of the fibers secured in fluid-tight relationship with each other in each of said headers; liquid collection means to collect said permeate, connected in open fluid communication with said lower face of each of said headers; and, means to withdraw said permeate. A process for maintaining the outer surfaces of hollow fiber membranes essentially free from a build-up of deposits of particulate material while separating a permeate from a multicomponent liquid substrate in a reservoir, said process comprising, providing an alternative to a conventional module having plural individual arrays therewithin, by submerging a frameless array of fibers deployed as a skein within said substrate unconfined in a modular shell, said fibers being securely held in laterally opposed, spaced-apart first and second headers, said fibers having a transmembrane pressure differential in the range from about 0.7 kPa (0.1 psi) to about 345 kPa (50 psi), a total surface area >1 m2, and a length sufficiently greater than the direct distance between said first and second headers, so as to present said skein in a buoyantly swayable generally arcuate fiber configuration above a horizontal plane through the horizontal center-line of a header; mounting said headers in fluid-tight open communication with collection means to collect said permeate; flowing a fiber-cleansing gas through a gas-distribution means proximately disposed relative to said skein, within a zone directly beneath said skein, and contacting surfaces of said fibers with sufficient physical impact of bubbles of said gas to maintain essentially the entire length of each fiber in said skein awash with bubbles and essentially free from said build-up; maintaining an essentially constant flux through said fibers substantially the same as an equilibrium flux initially obtained after commencing operation of said process; collecting said permeate in said collection means; and, withdrawing said permeate.
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