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A Study on the Recovery of Carbon Energy by Thermophilic Aerobic Digestion  

Yi, Yunseok (Department of Environmental Engineering, Graduate School, Korea University)
Kim, Ryunho (Department of Environmental Engineering, Graduate School, Korea University)
Yun, Zuwhan (Department of Environmental Engineering, Graduate School, Korea University)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.6, 2007 , pp. 906-912 More about this Journal
Abstract
A lab-scale thermophilic aerobic digestion (TAD) system was operated at $64^{\circ}C$ with mixed primary and secondary sludges taken from a large wastewater treatment plant. The semi-continuously operated reactor at HRTs of 1, 3 and 6 days indicated that longer HRT could stabilize sludge organics and solids comparable to anaerobic digestion. It has been found that reduced HRT of 3 and 1 day produced the effluent with highly biodegradable soluble organics, indicating the possibility of energy recovery in TAD. No proof of biological nitrification was observed at thermophilic operating temperature of $64^{\circ}C$, while nitrogen removal seemed due to nitrogen exertion during the aerobic thermophilic cell synthesis as well as ammonia stripping.
Keywords
Carbon recovery; Nitrogen conversion; Thermophilic aerobic digestion;
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