Patent ID: 9675938
Date: 2017-06-13
CPC Classifications: B01D,C02F

Claim:
1. A method of cleaning a porous polymeric membrane having a feed side and a permeate side comprising: providing a liquid on the feed side of the membrane; reducing a feed side volume of the liquid by filtration; suspending the filtration and the reduction of the feed side volume when the feed side volume is less than half of a feed side liquid holding volume and a level of the liquid is above a lower potting of the membrane; introducing a fluid containing a cleaning agent to the permeate side of the membrane subsequent to the suspension of the filtration and the reduction of the feed side volume; contacting the permeate side and pores of the membrane with the fluid containing the cleaning agent under static head pressure for a predetermined time of at least 30 seconds; removing the fluid containing the cleaning agent from the permeate side of the membrane; and resuming filtration.