Energy efficient wastewater treatment for nitrogen and...

Details Energy efficient wastewater treatment for nitrogen and... Energy efficient wastewater treatment for nitrogen and...

2007-02-06

2007-02-06

Prince, Fred G. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S210000, C210S623000, C210S630000, C210S903000, C210S906000, C210S259000

Reexamination Certificate

active

10909104

ABSTRACT:
In a wastewater treatment plant, the liquid side of the plant has preferably four stages for nitrification and/or denitrification, prior to further treatment such as a clarifier. Energy requirements are reduced by reducing aeration requirements. Four or more tanks/zones comprise serial anoxic and aerobic stages, but in the anoxic stages simultaneous nitrification/denitrification takes place in accordance with the known process of U.S. Pat. No. 5,906,746. By this arrangement the system can achieve a volume ratio of about 20% aerobic tankage to the total tankage volume, as compared to a much higher ratio in a typical prior art system of serial aerobic/anoxic stages, and greatly reducing aeration requirements.

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