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Baffle for conversion of fine bubbles to coarse while filtering with a vertical skein of hollow fibers

  • US 5,910,250 A
  • Filed: 06/16/1997
  • Issued: 06/08/1999
  • Est. Priority Date: 08/11/1995
  • Status: Expired due to Term
First Claim
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1. In a filtration device for withdrawing permeate essentially continuously from a multicomponent liquid substrate in a reservoir while increasing the concentration of particulate material therein, said membrane device including:

  • a multiplicity of hollow fiber membranes, or fibers;

    a first header and a second header disposed in transversely spaced-apart relationship with at least said second header within said substrate;

    said first header having a terminal end portion of each fiber secured therein, and said 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;

    said fibers being sealingly secured with open ends of the fibers secured in fluid-tight relationship with each other in each of said headers;

    permeate collection means to collect said permeate, sealingly connected in open fluid communication with a permeate-discharging face of each of said headers; and

    , means to withdraw said permeate;

    said fibers, said headers and said permeate collection means together forming a vertical skein wherein said fibers are essentially vertically disposed;

    said first header being upper and disposed in vertically spaced-apart relationship above said second header, with opposed faces at a fixed distance;

    each of said fibers having substantially the same length, the improvement comprising, a foraminous conversion baffle removably secured to said second header near the permeate discharging face thereof, said baffle being adapted to trap and discharge gas flowing under said baffle in a vertically upward direction, said baffle having through-openings therein sized to discharge said gas as coarse bubbles in a size range effective to scrub outer surfaces of said fibers.

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