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An Economic Approach to Off-Line Storage: A Means of Mitigating SSOs

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This paper reports on the use of a two cell 30-million-gallon (MG) equalization basin and diesel engine-driven pump station as a means of mitigating sanitary sewer overflows (SSOs). The ultimate capacity of the pump station, which utilizes vertical turbine solids handling pumps (VTSH) arranged in a self-cleaning trench-style wet well, is 68 million gallons per day (MGD). Configuring the pump station with diesel engine-driven pumps provided a 20-year, 1 million present worth savings in comparison to a conventional electrical motor driven pump station arrangement. The use of diesel engine-driven pumps eliminated the peak electrical usage of 450- horsepower (HP) electrical motors, as well as the need for variable frequency drives and redundant power generation needs during electrical outage time periods. A supplemental 150- kilowatt (kW) generator was installed to provide emergency power needs for SCADA, seal water systems, influent screen, and a 50-HP maintenance pump for wetwell cleaning.

Keywords: SSOs; energy savings; engine-driven pumps; off-line storage; trench wetwell

Document Type: Research Article


Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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