Method for purifying waste water, and purification plant for carrying out said method

  • US 6,709,593 B2
  • Filed: 01/07/2003
  • Issued: 03/23/2004
  • Est. Priority Date: 08/16/2000
  • Status: Expired due to Term
First Claim
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1. Method for treating waste water, comprising:

  • providing first and second inlet streams of waste water of different origins, the waste water of said second inlet stream having a concentration of dissolved impurities substantially higher than that of the waste water of said first inlet stream;

    in an anaerobic treatment zone subjecting the waste water of said second inlet stream to an anaerobic degradation of the dissolved contents to form digested sludge and digested gas;

    in an aerobic treatment zone subjecting the waste water of said first inlet stream to an aerobic treatment to form an additional sludge;

    sending the additional sludge to the anaerobic treatment zone;

    mechanically dewatering the additional sludge before sending it into the anaerobic treatment zone; and

    controlling the degree of dewatering in such a way that the concentration of dry substance in the anaerobic treatment zone does not fall below a predetermined minimum value for long periods of time.

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