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.
| Edition : | Vol. 76 - No. 12 |
| File Size : | 1
file
, 1.6 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 12/01/1984 |
