Method and system for cleansing a filter bed

Details Method and system for cleansing a filter bed Method and system for cleansing a filter bed

B - Operations, Transporting

01

D

182/98

B01D 24/46 (2006.01) B01D 24/22 (2006.01)

Patent

CA 1288059

METHOD AND SYSTEM OF CLEANSING A FILTER BED ABSTRACT An improved method of cleansing a filter bed is herein provided utilizing a backwash pump (12) having an inlet line (14) and an outlet line (16). The improved method and system includes two cycle operations. Initially, the filter bed is backwashed to remove contaminants from the filter bed with the backwash pump (12) drawing liquid from an effluent channel (26). A portion of the liquid passing on backwash pump outlet line (26) is passed through a bypass adjustment valve (34) for egress on an outlet line (38) for recirculation to the effluent channel (26). The second stage of the cleansing operation is through a purging cycle where the filter bed is purged subsequent to the backwashing operation for removal of further contaminants from the filter bed. In the purging cycle, a closed loop system is formed between the bachwash pump (12) and the backwash shoe (28) with a portion of liquid being diverted through a purge adjustment valve member (44) for egress on an outlet line (46) external to the system or to a separate filter member.

510542

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