Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2005-06-30
2008-03-18
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S620000, C210S626000
Reexamination Certificate
active
07344643
ABSTRACT:
Contaminated wastewaters comprising biochemical oxygen demand (BOD), nitrogen and phosphorus are treated by an activated sludge process. The process utilizes an activated sludge tank, a solid-liquid separator, and a bioreactor to significantly reduce, or eliminate, waste activated sludge (WAS) within a sludge stream. A sidestream reactor is employed downstream from the bioreactor to remove soluble phosphates left in the sludge stream by the low WAS process. Within the sidestream reactor, a source of multivalent metal ions is added to a slightly alkaline sludge stream to precipitate the phosphates. The solid phosphates have a specific gravity higher than that of the organic matter in the sludge stream and may be separated from the sludge stream based upon differential settling velocity.
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“Contras
Barnes Dennis J.
Elefritz, Jr. Robert A.
Barry Chester T.
Siemens Water Technologies Holding Corp.
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