AWWA JAW17205

This article addresses regulations governing declining-rate filters and presents operating experiences from selected full-scale declining rate filter plants. The design and operation principles of constantrate and declining-rate filtration are discussed, and influentcontrolled and effluent-controlled declining-rate filter systems are described. Advantages of declining-rate filtration control over constant-rate filtration control are presented. A survey of state regulations indicates that no specific requirements exist for the design and operation of declining-rate filters and that regulations do not allow for differentiation between the two types of filters. Summaries of operating experiences at the following declining-rate filter plants are presented: the Southwest and Water Works Park plants in Detroit, Michigan; the Central Plant and the Chain of Rocks Water Treatment Plant in St. Louis, Missouri; the Dalecarlia Water Treatment Plant; the Northwest River Water Treatment Plant in Chesapeake, Virginia; and the Deer Valley Water Treatment Plant in Phoenix, Arizona. Includes 12 references, table, figures.

Product Details

Edition:

Vol. 76 - No. 12

Published:

12/01/1984

Number of Pages:

7

File Size:

1 file , 1.6 MB