Method and system for treating water and utilizing a membrane filtering system

US7695624B2 · kind B2 · utility

Assignee

• OTV SA · FR

Inventors

• Martin Brockmann · Lengerich, DE
• Heribert Moeslang · Ratingen, DE
• Dietmar Schnuell · Meerbusch, DE
• Hong Zhao · Edison, US
• David Thaure · Joinville-le-Pont, FR
• Pierre Girodet · Asnières, FR

Key dates

• Filing date: Jun 9, 2008
• Grant date: Apr 13, 2010
• Expiry date: Oct 2, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W10/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method and system is provided for treating wastewater. In one process, wastewater is directed into a treatment tank and biologically treated. The biologically treated wastewater is directed as mixed liquor from the treatment tank to a bottom portion of a downstream filtration tank having at least one submerged membrane module that extends across substantially the entire cross sectional area of the filtration tank mixed liquor is directed from the bottom of the filtration tank upwardly into the membrane module such that substantially all of the mixed liquor received in the bottom of the filtration tank flows through the membrane module. As the mixed liquor flows vertically through the membrane module, the method includes inducing at least some of the mixed liquor through walls of one or more membrane filters that form a part of the membrane module, producing a permeate stream. The remaining mixed liquor passing through and from the membrane module is referred to as a non-permeate stream and the non-permeate stream, or at least a substantial portion thereof, is recirculated to the treatment tank. The filtration tank is sized relative to the membrane module and the process is carrie…