Siemens Water Technologies Pte. Ltd.

Siemens Industry, Inc.

Dennis J Barnes

George W Smith

A method and system for wastewater treatment comprising a first treatment zone () fluidly connected to one or more further treatment zones (), a membrane module () comprising a filter membrane positioned in or fluidly connected to the further treatment zone (), a gravity settling device () fluidly connected to the first treatment zone () to receive overflow therefrom; and a flow control device () between the first treatment zone () and the gravity settling device () to control the flow of liquid therebetween.

Infiltration/inflow control for membrane bioreactor

A wastewater treatment system comprising: a first treatment zone () fluidly connected to one or more further treatment zones (-), a membrane module () comprising a filter membrane is positioned in or fluidly connected to the further treatment zone; and a gravity settling device () fluidly connected to the first treatment zone () to receive overflow therefrom. A method of treating wastewater comprising flowing wastewater through one or more treatment zones (-) to produce a fluid product which is passed through a filter membrane () 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 (); when the flow of wastewater water exceeds a predetermined level, flowing a portion of the returned mixed liquor to a gravity settling device () and clarifying the mixed liquor within the gravity settling device ().

A process for treating biological oxygen demand (BOD), nitrogen and phosphorus containing wastewater, wherein the process includes providing wastewater influent to an oxygen-deficit aeration zone having activated sludge and mixing the wastewater influent with the activated sludge in the oxygen-deficit aeration zone to form a mixed liquor. The process further includes transferring the mixed liquor from the oxygen-deficit aeration zone to an oxygen-surplus aeration zone and transferring a portion of the mixed liquor from the oxygen-surplus aeration zone to a membrane filter wherein a filtrate is separated from sludge. In addition, the process includes recycling at least a portion of the sludge to the oxygen-deficit aeration zone as recycled activated sludge.

Aerated anoxic membrane bioreactor

A process for treating BOD, nitrogen and phosphorus containing wastewater, wherein the process includes the steps of providing wastewater influent into an anoxic zone having activated sludge and mixing the wastewater influent with the activated sludge in the anoxic zone to form a mixed liquor. The process further includes providing the mixed liquor into one more further treatment zones and transferring a portion of the mixed liquor from the further treatment zone to a membrane filter wherein a filtrate is separated from sludge. The process also includes selectively recycling at least a portion of the sludge to the anoxic zone as recycled activated sludge.

Process to improve the efficiency of a membrane filter activated sludge system

A process for treating BOD, nitrogen and phosphorus containing wastewater, wherein the process includes providing wastewater influent into an anaerobic zone having activated sludge and mixing the wastewater influent with the activated sludge in the anaerobic zone to form a mixed liquor. The process further includes providing the mixed liquor into an oxygen-deficit aeration zone and recycling denitrified mixed liquor from the oxygen-deficit aeration zone to the anaerobic zone for mixing therein with wastewater. In addition, the process includes transferring the mixed liquor from the oxygen-deficit aeration zone to an oxygen-surplus aeration zone and transferring a portion of the mixed liquor from the oxygen-surplus aeration zone to a membrane filter wherein a filtrate is separated from sludge. The process also includes recycling at least a portion of the sludge to the oxygen-deficit aeration zone as recycled activated sludge.

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Oconomowoc, WI, United States of America

Dennis J Barnes