Multi-cell filter apparatus and turbidity monitor

摘要

A filter apparatus having a backwash head arranged to up-flow backwash one filter cell at a time, and a scavenging means having a fluid intake head arranged to communicate with at least two cell ports at the same time to downflow scavenge each filter cell the first time when the backwash head is in a position to backwash one filter cell and a second time when the backwash head is in a position to backwash a succeeding filter cell. Turbidity monitoring means having a monitor inlet conduit mounted on the fluid intake head, is arranged for communication with the cell port adjacent the end of the fluid intake head that trails during the backwash run, to monitor turbidity of fluid from each cell port only after the associated filter cell has scavenged at least once. The apparatus is arranged so that the backwash pump has its outlet connected to the backwash port of the backwash head and its inlet connected to the fluid intake port of the scavenging means to receive at least a portion of the backwash fluid through the intake port and utilize fluid scavenged from the cell ports to backwash a succeeding port.