Effect of thermal hydrolysis pre-treatment on anaerobic digestion of municipal biowaste : A pilot scale study in China(ENVIRONMENTAL BIOTECHNOLOGY)
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概要
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Co-digestion of wasted sewage sludge, restaurant kitchen waste, and fruit-vegetable waste was carried out in a pilot plant with thermal hydrolysis pre-treatment. Steam was used as heat source for thermal hydrolysis. It was found 38.3% of volatile suspended solids were dissolved after thermal hydrolysis, with digestibility increased by 115%. These results were more significant than those from lab studies using electricity as heat source due to more uniform heating. Anaerobic digesters were then operated under organic loading rates of about 1.5 and 3 kg VS/(m^3 d). Little difference was found for digesters with and without thermal pre-treatment in biogas production and volatile solids removal. However, when looking into the digestion process, it was found digestion rate was almost doubled after thermal hydrolysis. Digester was also more stable with thermal hydrolysis pre-treatment. Less volatile fatty acids (VFAs) were accumulated and the VFAs/alkalinity ratio was also lower. Batch experiments showed the lag phase can be eliminated by thermal pretreatment, implying the advantage could be more significant under a shorter hydraulic retention time. Moreover, it was estimated energy cost for thermal hydrolysis can be partly balanced by decreasing viscosity and improving dewater-ability of the digestate.
- 2013-07-00
著者
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OSHITA Kazuyuki
Department of Urban & Environmental Eng., Kyoto University
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Liu Xiao
School Of Pharmaceutics Sciences Peking University:johns Hopkins-nuh International Medical Center
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Wang Wei
School Of Automation Science And Electrical Engineering Beijing University Of Aeronautics And Astron
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Takaoka Masaki
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University
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Zhou Yingjun
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University
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Liu Xiao
School of Environment, Tsinghua University
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Oshita Kazuyuki
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University
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Wang Wei
School of Environment, Tsinghua University
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