Liquid purification or separation – Recirculation
Reexamination Certificate
2006-03-28
2006-03-28
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Recirculation
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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