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Method and plant for thickening sludge derived from water treatment by flocculation-decantation with ballasted floc

  • US 6,966,993 B2
  • Filed: 02/08/2002
  • Issued: 11/22/2005
  • Est. Priority Date: 02/09/2001
  • Status: Expired due to Term
First Claim
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1. A method for thickening sludge produced by a ballasted flocculation water or wastewater treatment system comprising:

  • a. directing a mixture of sludge and granular material from the ballasted flocculation water or wastewater treatment system to a sludge separator and separating the sludge from the granular material;

    b. directing the separated sludge to a degassing area and degassing the sludge;

    c. injecting a flocculation agent into the sludge; and

    d. directing the sludge to a sludge thickener with a load at a sill calculated on the sill surface of the thickener greater than 200 kgMIS/m2/day, and producing a thickened sludge having a concentration greater than 10 gm/l.

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