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Wastewater treatment method and plant

  • US 5,961,830 A
  • Filed: 05/13/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 11/18/1994
  • Status: Expired due to Fees
First Claim
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1. A method of nitrifying and denitrifying wastewater under pressure comprising:

  • a. directing wastewater into a pressurized aerobic zone and biologically nitrifying the wastewater under pressure so as to convert ammonia to soluble oxidized nitrogen;

    b. transferring at least a portion of the nitrified wastewater from the pressurized aerobic zone to a pressurized deoxygenation zone;

    c. deoxidizing the wastewater under pressure within the pressurized deoxygenation zone so as to substantially remove dissolved oxygen from the wastewater;

    d. transferring the deoxidized wastewater from the pressurized deoxygenation zone to a pressurized anoxic zone; and

    e. biologically denitrifying the wastewater in the anoxic zone under pressure by biologically converting the soluble oxidized nitrogen contained in the wastewater to gaseous nitrogen.

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  • 3 Assignments
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