Apparatus and method for treating FGD blowdown or similar liquids

  • US 7,550,087 B2
  • Filed: 12/11/2006
  • Issued: 06/23/2009
  • Est. Priority Date: 07/25/2005
  • Status: Active Grant
First Claim
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1. A process for the treatment of a liquid comprising:

  • a) physical and/or chemical pretreatment of the liquid to remove total suspended solids and to soften the liquid;

    b) ammonia stripping of the liquid;

    c) anoxic treatment to remove nitrate;

    d) a second anoxic treatment after step (c) to remove selenium and anaerobic treatment to remove heavy metals; and

    ,e) membrane separation of the liquid upstream of step (d).

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