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DESIGN AND PERFORMANCE OF SLOW SAND FILTERS IN THE PACIFIC NORTHWEST
Citation:
Logsdon, G., S. Tanner, M. Grimm, AND R. James. DESIGN AND PERFORMANCE OF SLOW SAND FILTERS IN THE PACIFIC NORTHWEST. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/034 (NTIS PB91176875).
Description:
This paper was prepared as a review of slow sand filtration design and operating practices at 13 filtration plants constructed between 1958 and 1988 in the Pacific Northwest. t represents an attempt to learn from the past in order to do a better job in the future. mong the topics presented are plant construction features, including media characteristics, filter design, and hydraulics; water quality; and operation and maintenance practices. arrative descriptions of each plant are given, and some specific design and operating examples are presented. ata from the plants have been tabulated so that frequently observed or common characteristics of design and operation can be noted. inally, some comments are made about recent design and operating practices, in order to assist those who will design or operate slow sand filters in coming years. Slezak and Sims (1984) reported on a survey of slow sand filtration in the United States. hey found that three quarters of the plan's responding to their questionnaire treated lake water. ne third of the plants ranged in age from 0 to 25 years and could be considered to represent modern thinking on slow sand filters. nly one of the plants in their list of facilities that responded to the survey was located in the Pacific Northwest. hus there should he little overlap between their survey and this one.