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Influence of COD/Nitrate-N Ratio on Denitrification and Methanogenesis in Anaerobic Sludge  

Park, Sang-Min (Department of Environmental Engineering, Chungbuk National University)
Jun, Hang-Bae (Department of Environmental Engineering, Chungbuk National University)
Choi, Chang-Ok (Department of Environmental Engineering, Chungbuk National University)
Lee, Joon-Sang (Department of Engineering and Architecture, Sunjin Co., Ltd)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.7, 2005 , pp. 739-745 More about this Journal
Abstract
Simultaneous denitrification and methanogenesis at various influent COD/Nitrate-N(below C/N) ratio was investigated with two different anaerobic sludges of which one was inoculated with glucose only and the other was inoculated with glucose and nitrate. Three different C/N ratios of 30, 20, and 10 were applied with each anaerobic sludge in serum bottles agitated in a rotary shaker to monitor the time related changes of amount of gas production and gas composition. Glucose was used as a single carbon source, which was adjusted to 1,000 mg/L as COD and potassium nitrate was used as a nitrogen source to adjust the each C/N ratio. COD removal by methanogenesis was dominant at higher C/N ratios, while COD removal by denitrification was dominant at lower C/N ratios. With the sludges cultured at C/N ratios below 10, SMA and SDNR rising different carbon substrates were investigated. The most efficient carbon substrate was acetate and the highest SMA and SDNR were 0.76 g COD/g VSS day with pure anaerobic sludge and 1.38 g ${NO_3}^--N/g$ VSS day with sludge cultured at C/N ratio of 5, respectively.
Keywords
Simultaneous Denitrification and Methanogenesis; C/N(COD/Nitrate-N) Ratio; SMA(Specific Methanogenesis Activity); SDNR(Specific Denitrification Rate);
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