Infiltration/inflow control for membrane bioreactor
First Claim
1. A wastewater treatment system, comprising:
- at least one biological treatment zone;
a membrane module fluidly connected downstream of the at least one biological treatment zone;
a gravity settling device fluidly connected to the at least one biological treatment zone;
a feedback line fluidly connecting a feed side of the membrane module to the at least one biological treatment zone; and
a controller configured to operate in a first mode of operation during inflow conditions that are at or below a predetermined level to direct all inflow through the at least one biological treatment zone to the membrane module, and further configured to operate in a second mode of operation during inflow conditions that exceed the predetermined value to divert at least a portion of inflow from the at least one biological treatment zone to the gravity settling device.
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Accused Products
Abstract
A wastewater treatment system comprising: a first treatment zone (11) fluidly connected to one or more further treatment zones (12-14), a membrane module (16) comprising a filter membrane is positioned in or fluidly connected to the further treatment zone; and a gravity settling device (15) fluidly connected to the first treatment zone (11) to receive overflow therefrom. A method of treating wastewater comprising flowing wastewater through one or more treatment zones (11-14) to produce a fluid product which is passed through a filter membrane (16) to produce a concentrated mixed liquor and a filtrate; returning at least a portion of the concentrated mixed liquor to at least one of the treatment zones (11); when the flow of wastewater water exceeds a predetermined level, flowing a portion of the returned mixed liquor to a gravity settling device (15) and clarifying the mixed liquor within the gravity settling device (15).
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Citations
20 Claims
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1. A wastewater treatment system, comprising:
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at least one biological treatment zone; a membrane module fluidly connected downstream of the at least one biological treatment zone; a gravity settling device fluidly connected to the at least one biological treatment zone; a feedback line fluidly connecting a feed side of the membrane module to the at least one biological treatment zone; and a controller configured to operate in a first mode of operation during inflow conditions that are at or below a predetermined level to direct all inflow through the at least one biological treatment zone to the membrane module, and further configured to operate in a second mode of operation during inflow conditions that exceed the predetermined value to divert at least a portion of inflow from the at least one biological treatment zone to the gravity settling device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification