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Immersed membrane filtration system and overflow process

  • US 7,052,610 B2
  • Filed: 01/21/2005
  • Issued: 05/30/2006
  • Est. Priority Date: 11/18/1999
  • Status: Expired due to Term
First Claim
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1. A process of filtering water comprising the steps of,a) providing one or more modules of filtering membranes immersed in water in a tank open to the atmosphere;

  • b) providing one or more open channels connected to a retentate outlet, the one or more open channels spanning a portion of the tank above the one or more modules;

    c) permeating filtered water by (i) adding a selected volume of feed water to the tank and (ii) withdrawing substantially the selected volume of water through the one or more modules as permeate;

    d) periodically stopping permeation to perform a deconcentration step, the deconcentration step further comprising at least one of (I) backwashing or (II) providing a flow of feed water into the tank from below the modules or both (I) and (II); and

    ,e) flowing excess water containing retained solids out of the retentate outlet via the one or more open channels during the deconcentration step.

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