Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2005-03-08
2005-03-08
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S626000, C210S797000, C210S220000, C210S195200, C210S198100, C210S739000, C210S694000
Reexamination Certificate
active
06863818
ABSTRACT:
An apparatus using activated sludge for the removal of biological nutrients from a wastewater includes a bioreactor for containing a mixture of wastewater under treatment and activated sludge. The bioreactor is divided into a plurality of serially connected treatment zones and includes a wastewater inlet, a downstream aerobic zone and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone. A method for removal of nutrients from a wastewater includes providing a wastewater to an inlet of a serial, multi-zone, activated sludge bioreactor containing an activated sludge. The bioreactor has a downstream aerobic zone from which water is removed and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone.
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Broderick Thomas A.
Daigger Glen T.
Fleischer Edwin J.
Murthy Sudhir N.
Wollmann Albert M.
Barry Chester T.
CH2M Hill Inc.
Swanson & Bratschun LLC
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