Chemical Clean For Membrane Filter
First Claim
1. A method of cleaning a hollow fibre porous polymeric membrane having a feed side and a permeate side including comprising the steps of:
- introducing a fluid containing a cleaning agent to the permeate side of a membrane; and
allowing the cleaning agent to contact the permeate side of the membrane under static pressure for a predetermined time and contact the pores of the membrane.
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Accused Products
Abstract
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.
136 Citations
26 Claims
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1. A method of cleaning a hollow fibre porous polymeric membrane having a feed side and a permeate side including comprising the steps of:
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introducing a fluid containing a cleaning agent to the permeate side of a membrane; and allowing the cleaning agent to contact the permeate side of the membrane under static pressure for a predetermined time and contact the pores of the membrane. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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2. A method of cleaning a hollow fibre porous polymeric membrane having a feed side and a permeate side comprising the steps of:
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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; and allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time and contact the pores of the membrane. - View Dependent Claims (3)
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4. A method of cleaning a hollow fibre porous polymeric membrane having a feed side and a permeate side including comprising the steps of:
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providing a feed side fluid in contact with the feed side of the membrane; introducing a fluid containing a cleaning agent to the permeate side of a membrane; and allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time to contact the pores of the membrane and diffuse into the feed side fluid. - View Dependent Claims (5, 6)
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26-33. -33. (canceled)
Specification