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Improving Energy Efficiency and Effluent Quality, and Reducing Operating Costs by Controlling Nitrification and Denitrification through Operational Modifications

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Faced with a stringent discharge permit, increasing influent flow and organic loading, and denitrification in their clarifiers, Rockaway Valley Regional Sewerage Authority (RVRSA), adopted a rigorous operations strategy aimed at solving the issues facing the facility while reducing overall operating costs. Strict process control allowed RVRSA's oxidation ditch facility to perform nitrification and denitrification within the ditches, minimizing denitrification in the clarifiers. Each oxidation ditch is currently being operated at 30 percent over its rated capacity. Additionally, allowing denitrification in the oxidation ditches significantly reduces electrical demand and improves oxygen transfer. Using this operational strategy the facility is saving over $230,000 per year in electricity savings. The process control and operation method lends itself well to phosphorus removal as seen their low effluent total phosphorus values averaging 1.5 mg/L. Similar operational strategies have been implemented at other facilities and are applicable to other treatment plant configurations.
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Keywords: BIOLOGICAL PHOSPHORUS REMOVAL; DENITRIFICATION; ON/OFF AERATION; OXIDATION DITCH; PROCESS CONTROL

Document Type: Research Article

Publication date: 2007-10-01

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