Liquid purification or separation – Automatic control
Reexamination Certificate
2006-01-25
2008-11-25
Prince, Fred (Department: 1797)
Liquid purification or separation
Automatic control
C210S195200, C210S195300, C210S259000
Reexamination Certificate
active
07455765
ABSTRACT:
The invention is directed to a wastewater treatment system having an anoxic biological treatment zone, an aerobic biological treatment zone and a separator. The concentration of oxygen in streams within the system is strategically managed for improved removal of nutrient from the wastewater. A source of biodegradable carbon may be introduced to reduce the concentration of oxygen within the system. An effective treatment time under anoxic or aerobic conditions may further be varied.
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Elefritz Robert A.
Liu Wenjun
Prince Fred
Siemens Water Technologies Corp.
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