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Method of Removing Phosphorus from Wastewater

  • US 20080314830A1
  • Filed: 06/22/2007
  • Published: 12/25/2008
  • Est. Priority Date: 06/22/2007
  • Status: Active Grant
First Claim
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1. A ballasted flocculation process for removing phosphorous from wastewater comprising:

  • a. adding iron or aluminum salt to influent wastewater;

    b. mixing a flocculant with the wastewater;

    c. mixing an insoluble granular material with the wastewater that results in the formation of ballasted flocs;

    d. directing the wastewater and ballasted flocs to a settling tank and separating clarified effluent from sludge which includes the insoluble granular material and iron or alum;

    e. directing the settled sludge to a separator and separating the insoluble granular material from the sludge;

    f. concentrating the iron or aluminum in the wastewater by recycling a substantial portion of the iron or aluminum containing sludge and mixing the recycled iron or aluminum containing sludge with the influent wastewater; and

    g. removing phosphorous from the wastewater by adsorbing phosphorous onto the iron or alum.

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