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CSO Pollution Abatement Project Performance

by Herbert L. Kaufman, Clinton Bogert Assoc, Englewood Cliffs, United States,
Dennis F. Lai, Clinton Bogert Assoc, Englewood Cliffs, United States,
Victor Gacusan, Clinton Bogert Assoc, Englewood Cliffs, United States,



Document Type: Proceeding Paper

Part of: Water Resources Planning and Management and Urban Water Resources

Abstract:

The City of Trenton, NJ combined sewer overflow (CSO) pollution abatement project has been in operation for more than four years. Daily records include composite BOD₅ concentrations, flow and rainfall. About one-seventh of the City, but about 50 percent of the population (100,000), is served by a combined sewer system. The remainder is served by separate sewers. All sewage is conveyed by the Lamberton Interceptor to treatment. The Lamberton Interceptor capacity is 217 MGD, sufficient to convey both combined and sanitary sewage without overflow. A single CSO is located just upstream of the treatment plant. The facility was designed to accept all flows from a storm with a one-year return frequency. During the past four years, one overflow of 1.5 hours duration was experienced at the end of a two-year return frequency storm. The treatment plant is designed for an average flow of 20 MGD and a peak flow of 27 MGD. The present average flow is about 17 MGD and the plant removes about 90 percent of the BOD₅ reaching it. Daily flow is measured and totaled ending at midnight. Rainfall and BOD₅ are totaled at 8:00 A.M. and are recorded as occurring on the previous day. The rain gage is located about one mile from the combined sewer area.

Subject Headings: Combined sewers | Flow measurement | Overflow | Water pollution | Sewage | Water treatment plants | Waste treatment plants

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