Apparatus for biological treatment of waste waters

Liquid purification or separation – Recirculation

Reexamination Certificate

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Details

C210S202000

Reexamination Certificate

active

07018530

ABSTRACT:
In a vertical shaft bioreactor, improved devices and methods are provided for enhanced secondary and/or tertiary treatment of wastewater, including residential, municipal and industrial wastewater. The devices and methods of the invention are useful for enhanced secondary wastewater treatment, including BOD and TSS removal. Tertiary treatment can alternately or additionally be achieved in the bioreactor with nitrification of ammonia, with nitrification and denitrification, and with nitrification, denitrification, and chemical phosphorus removal. A vertical shaft bioreactor is also provided which achieves thermophilic aerobic digestion and pasteurization of sewage sludges, optionally to produce class A biosolids.

REFERENCES:
patent: 4253949 (1981-03-01), Hines et al.
patent: 6733662 (2004-05-01), Pollock

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