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Method for treating wastewater

  • US 7,722,769 B2
  • Filed: 05/09/2008
  • Issued: 05/25/2010
  • Est. Priority Date: 10/05/2005
  • Status: Expired due to Fees
First Claim
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1. A method of treating wastewater comprising:

  • contacting a wastewater with anoxic bacteria immobilized on a fluidized media to produce a first water product;

    contacting at least a first portion of the first water product with air to form a second water product;

    passing the second water product through a filter membrane to produce a filtrate and a concentrated mixed liquor comprising dissolved oxygen;

    removing at least a portion of the dissolved oxygen from the concentrated mixed liquor to form a reduced oxygen content concentrated mixed liquor;

    contacting at least a second portion of the first water product with the reduced oxygen content concentrated mixed liquor to form a secondary wastewater; and

    contacting the secondary wastewater with the anoxic bacteria immobilized on the fluidized media.

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