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US 7,455,765 B2Granted
Wastewater treatment system and method
AssigneeSiemens Water Technologies Corp.
InventorsRobert A. Elefritz, Wenjun Liu
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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.
Claims9
A wastewater treatment system, comprising:
- a first biological treatment zone;
- a second biological treatment zone fluidly connected to the first biological treatment zone;
- a membrane module comprising a filter membrane fluidly connected to the second biological treatment zone;
- a recycle system fluidly connecting the membrane module to the first biological treatment zone;
- a source of biodegradable carbon fluidly connected to the recycle system;
- a sensor disposed to monitor a characteristic of a liquid exiting the second biological treatment zone;
- and
- a controller configured to allow introduction of the biodegradable carbon based on a signal from the sensor;
- wherein the controller is further configured to generate a first control signal that establishes a first liquid circuit from an outlet of the membrane module to an inlet of the second biological treatment zone, and further configured to generate a second control signal that establishes a second liquid circuit from an outlet of the second biological treatment zone to an inlet of the first biological treatment zone.
6 more elements
Dependencies are inferred from the claim text.