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Biological and ballasetd flocculation treatment of wastewater

  • US 8,454,831 B2
  • Filed: 03/08/2011
  • Issued: 06/04/2013
  • Est. Priority Date: 10/28/2005
  • Status: Active Grant
First Claim
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1. A method for biologically treating wastewater, the method comprising:

  • biologically treating the wastewater in a fixed-biomass biological reactor;

    directing the biologically treated wastewater to a ballasted flocculation system, and wherein a portion of the biomass from the biological reactor flows with the wastewater to the ballasted flocculation system;

    removing suspended solids from the wastewater by mixing the biologically treated wastewater with a ballast and a flocculant in the ballasted flocculation system to produce clarified wastewater and sludge, wherein the sludge contains suspended solids and the ballast having biomass accumulated thereon;

    separating the ballast having biomass accumulated thereon from the sludge;

    cleaning the ballast having biomass accumulated thereon by mixing the ballast with a cleaning solution;

    separating the cleaned ballast from the biomass; and

    recirculating the cleaned ballast to the ballasted flocculation system.

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