A dewatered sludge pumping system was designed for the Town of Speedway, Indiana Wastewater Treatment Plant. The system consists of a progressive cavity pump that is utilized to transfer belt filter press sludge cake, of approximately 20-percent solids content, to one of four, valved
discharge points in an adjacent sludge storage building. Sludge is conveyed a distance of approximately 130-ft. through 6-inch, 8-inch and 12-inch, glass-lined ductile iron pipe. The system has been operating effectively for approximately one-year and a data set consisting of 74 operating
days has been collected over an eight-month period. The objectives of this case study are to review design features which make the operation successful; to compare design discharge estimates with actual operating data; and to compare the operating data with empirical methods of estimating
discharge pressure found in the literature.
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