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ARE YOU INCLINED TO IMPROVE SETTLING: COST EFFECTIVE INCREASING OF SECONDARY CLARIFIER CAPACITY WITH INCLINED PLATES

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Abstract:

The City of Richmond (City), Virginia, similar to several older cities in the United States, has a central area that is served by a combined sewer system. Out of 38,000 acres of the City area approximately 12,000 acres are combined sewer area.

The City began implementing a phased Long Term Control Plan (LTCP) for CSO control in 1992 under a special order with the Virginia Department of Environmental Quality (DEQ). A series of wet weather/CSO treatment improvements have been completed under Phase I and Phase II of the plan.

A re-evaluation of the original LTCP was performed in 2001 at the completion of Phases I and II. The re-evaluation assessed the completed work in light of the US EPA's National CSO Control Policy issued in 1994 and state-of-the-art technologies. The re-evaluation findings are being used to make adjustments to the City's original LTCP, consistent with the provisions of the special order. The CSO Re-Evaluation proposed to use the City of Richmond Wastewater Treatment Plant (WWTP) to provide partial treatment of much higher wastewater flows during wet weather events. A portion of the wet weather flows at the WWTP would receive less than “full treatment”. Flows through the WWTP secondary treatment system would also be increased during wet weather events.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864704784138395

Publication date: 2004-01-01

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