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Simultaneous anoxic biological phosphorus and nitrogen removal

  • US 9,505,644 B2
  • Filed: 05/30/2014
  • Issued: 11/29/2016
  • Est. Priority Date: 09/20/2010
  • Status: Active Grant
First Claim
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1. A process for treating wastewater to simultaneously remove organic matter, nitrogen, and phosphorus, the process comprising:

  • providing two or more streams in a first tank operating under anoxic conditions, the two or more streams including plant influent wastewater and return activated sludge;

    mixing the plant influent wastewater and the return activated sludge in the first tank to form a mixed liquor;

    transferring the mixed liquor to a second tank operating under microaerophilic conditions to simultaneously effectuate nitrification, denitrification, phosphorous release, and phosphorus uptake in the second tank; and

    transferring the mixed liquor to a third tank that separates treated effluent from activated sludge containing microorganisms, wherein a first portion of the activated sludge is returned to the first tank as the return activated sludge and a second portion of the activated sludge is returned to the second tank.

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