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Alternative Supplemental Carbon Sources for the Step Feed BNR Process

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Use of methanol, primary sludge fermentate and acetate as supplemental carbon source to enhance denitrification in a high rate step feed BNR process (4.5 hr HRT, 8 day SRT) was evaluated at pilot scale. All three carbon sources increased denitrification performance at the operating conditions tested. Acetate and fermentate exhibited similar denitrification rates (0.15-0.30 mgN/mgVSS-d) whereas methanol rates were in the range of 0.04-0.08 mgN/mgVSS-d. The higher kinetic rates with acetate and fermentate, allowed a 15% reduction in supplemental carbon dose versus methanol. Overall net sludge yields at the operating conditions tested were 0.29, 0.30 and 0.34 mgVSS per mgCOD removed. Operation with acetate or fermentate would confer increased process stability and reliability by reducing anoxic volume requirements.

Document Type: Research Article


Publication date: January 1, 2002

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