Patent ID: 9375683
Filing Date: 2016-06-28
CPC Classification: B01D

Claim Text:
1. A filtration system comprising: (a) spiral wound filtration membrane module, comprising: (b) a permeate pump for returning a portion of the permeate discharged from said permeate collection tube at a controllable rate into the permeate inlet of the collection tube; (c) a feed stream pump for feeding the feed stream to the feed stream inlet at a controllable rate, wherein said permeate pump and feed stream pump being mutually controllable, (d) a controller for mutual control of the permeate pump and feed stream pump such the respective feed stream and permeate flow rates into the membrane module are mutually controllable effective to provide alternating separation and defouling phases during a production run wherein uniform transmembrane pressure is substantially maintained axially along the membrane during both phases of operation.