AWWA ACE92142

AWWA ACE92142 Testing the Performance of Vertical Flocculation Impellers
Conference Proceeding by American Water Works Association, 01/01/1992

Lang, John S.; Trussell, R. Rhodes; McCollum, Larry; Zfira, Gil ; Bailey, Debbie; Clark, Mark M.

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Tests were conducted at the Contra Costa Water District's Bollman Water Treatment Plant to evaluate four alternative types of vertical shaft flocculation impellers: rake or gate-type impellers; the Rushton turbine; the 45 pitched blade turbine; and the foil-type impeller (pitched blade turbine with camber). The objectives of the study were to characterize both the hydraulic and flocculation performance of the impellers at each of three scales.