LEWISTOWN WWTP LEWISTOWN, PA OPERATIONAL EFFICIENCY CASE STUDY IMPROVING SLUDGE & SECONDARY CLARIFIER SETTLING PERFORMANCE The Lewistown WWTP was originally constructed from 1949 -1954 as a Primary Treatment Facility. From 1979-1981 the plant expanded to treat 2.82 MGD and upgraded to a Secondary Treatment Facility utilizing the complete mix activated sludge process. From 1995-1996 a new headworks facility was constructed. Removal of inorganics a

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