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AWWA JAW34956

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AWWA JAW34956 Journal AWWA - Particle Behavior in Deep-Bed Filtration: Part 1 - Ripening and Breakthrough

Journal Article by American Water Works Association, 12/01/1993

Moran, Daniel C.;Moran, Melissa C.;Cushing, Robert S.;Lawler, Desmond F.

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Laboratory-scale filtration experiments were conducted using sedimentation basin effluent from a local lime-softening water treatment plant. An electronic particle counter was used to observe changes in the particle size distribution of the filtrate as a function of filter depth and time under a variety of filter operating conditions. The experiments were conducted for an extended period (up to 48 h) to observe the effects of both ripening and breakthrough over the duration of a typical water treatment plant filter cycle. The results indicate that ripening and breakthrough are not distinct stages but occur simultaneously for different-size particles. The effects of media size and filtration velocity were investigated, and simple normalizations were developed. Includes 31 references, table, figures.

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Edition: Vol. 85 - No. 12 Published: 12/01/1993 Number of Pages: 13File Size: 1 file , 2.4 MB