Chemical clean for membrane filter

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9675938
APP PUB NO 20080203017A1
SERIAL NO

11912859

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Importance

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Abstract

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A method of cleaning a porous polymeric membrane having a feed side and a permeate side including the steps of introducing a fluid containing a cleaning agent to the permeate side of a membrane allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time, and contact the pores of the membrane, or introducing a fluid containing a cleaning agent to the feed side of a membrane; applying a transmembrane pressure to force the fluid containing the cleaning agent from the feed side to the permeate side of the membrane; allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time, and contact the pores of the membrane. Preferably a concentration gradient between the feed side fluid and the lumen side fluid containing the cleaning agent causes cleaning agent to diffuse into the feed side fluid. Pressure may be applied to the fluid containing a cleaning agent to dislodge, where present, dissolved and undissolved solid from the membrane pores. The pressure may be applied in a pulsed fashion, and can be by way of compressed air at a pressure not more than the membrane's bubble point. The methods of the present invention may be preceded by, or followed with a backwash.

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First Claim

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Patent Owner(s)

  • EVOQUA WATER TECHNOLOGIES LLC

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cao, Zhiyi New South Wales, AU 20 420
Zha, Fufang New South Wales, AU 60 2936

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