Operating Periods

The length of filter run is a function of the effective size of the sand and the quantity of solids deposited on the surface of the filter. The EPA's Design Manual: Municipal Wastewater Stabilization Ponds (USEPA, 1983) and several other publications (Bishop et al., 1977; Harris et al., 1978; Hill et al., 1977; Marshall and Middlebrooks, 1974; Messinger, 1976; Russell et al., 1983; Tupyi et al., 1979) contain extensive information on the relationship between solids deposited on the surface of a filter and the length of run time. Truax and Shindala (1994) also reported run times very similar to those in the above studies, and their results are presented in Table 5.8.

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