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Reduction of Backwash liquid Waste

  • US 20070227973A1
  • Filed: 09/07/2005
  • Published: 10/04/2007
  • Est. Priority Date: 09/07/2004
  • Status: Active Grant
First Claim
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1. A method of filtering solids from a liquid suspension comprising the steps of:

  • (i) providing a pressure differential across the walls of permeable, hollow membranes immersed in the liquid suspension contained in a vessel, said liquid suspension being applied to the outer surface of the porous hollow membranes to induce and sustain filtration through the membrane walls wherein;

    (a) some of the liquid suspension passes through the walls of the membranes to be drawn off as permeate from the hollow membrane lumens, and (b) at least some of the solids are retained on or in the hollow membranes or otherwise as suspended solids within the liquid surrounding the membranes, (ii) suspending the flow of the liquid suspension to said vessel;

    (iii) reducing the volume of liquid suspension within said vessel;

    (iv) suspending the filtration process;

    (v) cleaning the membranes by dislodging at least some of the solids retained on or in the membranes; and

    (vi) removing the liquid containing dislodged solids from said vessel.

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