Wastewater treatment system and method
First Claim
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1. 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.
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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.
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9 Claims
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1. A wastewater treatment system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification