Wastewater treatment system and method
First Claim
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1. A wastewater treatment system, comprising:
- an anoxic treatment zone;
an aerobic treatment zone fluidly connected to the anoxic treatment zone;
a separator fluidly connected to the aerobic treatment zone; and
means for varying an effective treatment time under anoxic conditions.
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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.
65 Citations
56 Claims
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1. A wastewater treatment system, comprising:
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an anoxic treatment zone;
an aerobic treatment zone fluidly connected to the anoxic treatment zone;
a separator fluidly connected to the aerobic treatment zone; and
means for varying an effective treatment time under anoxic conditions. - View Dependent Claims (2, 3, 4)
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5. 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; and
a source of biodegradable carbon fluidly connected to the recycle system. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wastewater treatment system, comprising:
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a first biological treatment zone, having an inlet and an outlet;
a second biological treatment zone, having an inlet and an outlet, fluidly connected to the first biological treatment zone;
a third biological treatment zone, having an inlet and an outlet, fluidly connected to the second biological treatment zone; and
a separator, having an inlet and an outlet, fluidly connected to the third biological treatment zone, wherein the outlet of the separator is fluidly connected to the inlet of the third biological treatment zone, and wherein the outlet of the third biological treatment zone is fluidly connected to the inlet of the second biological treatment zone. - View Dependent Claims (18, 19, 20)
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21. A method of treating wastewater, comprising:
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anoxically treating the wastewater to produce a first water product;
aerobically treating the first water product to produce a second water product;
passing the second water product through a filter membrane to produce a concentrated mixed liquor and a filtrate; and
reducing a concentration of dissolved oxygen in at least a portion of the concentrated mixed liquor. - View Dependent Claims (22, 23, 24)
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25. A method of treating wastewater, comprising:
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introducing the wastewater to an anoxic treatment zone;
introducing the wastewater exiting the anoxic treatment zone to an aerobic treatment zone;
passing at least a portion of the wastewater exiting the aerobic treatment zone through a separator to produce a concentrated mixed liquor and a filtrate;
recycling at least a portion of the concentrated mixed liquor to the aerobic treatment zone; and
recycling at least a portion of the wastewater from the aerobic treatment zone to the anoxic treatment zone. - View Dependent Claims (26, 27, 28, 29)
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30. A method of treating wastewater, comprising:
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contacting the wastewater with anoxic bacteria in an anoxic zone to produce a first water product;
contacting the first water product with aerobic bacteria in an aerobic zone to produce a second water product;
passing the second water product through a separator to produce a concentrated mixed liquor and a filtrate;
establishing a first liquid circuit from an outlet of the separator to an inlet of the aerobic zone; and
establishing a second liquid circuit from an outlet of the aerobic zone to an inlet of the anoxic zone. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A method of treating wastewater, comprising:
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introducing the wastewater to an anoxic biological treatment zone;
introducing the wastewater exiting the anoxic biological treatment zone to an aerobic biological treatment zone;
passing at least a portion of the wastewater exiting the aerobic biological treatment zone through a separator to produce a concentrated mixed liquor and a filtrate; and
adjusting an effective volume of the anoxic biological treatment zone. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A wastewater treatment system, comprising:
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an anoxic treatment zone;
an aerobic treatment zone fluidly connected to the anoxic treatment zone;
a separator fluidly connected to the aerobic treatment zone; and
a controller in communication with an aeration system and configured to generate a first aeration control signal to allow increase of an effective volume of the anoxic treatment zone during a first biological treatment mode of operation, and further configured to generate a second aeration control signal to allow reduction of the effective volume of the anoxic treatment zone to a design condition during a second biological treatment mode of operation. - View Dependent Claims (51, 52, 53, 54, 55)
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56. A method of facilitating treating wastewater, comprising:
providing 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, and a source of biodegradable carbon fluidly connected to the recycle system.
Specification