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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
Published on: June 15, 2014
Evaluation of regional bioenergy recovery by local methane fermentation thermal recycling systems
Looi-Fang Wong1, Tsuyoshi Fujita, Kaiqin Xu
1Department of Civil Engineering, Toyo University, 2100 Kujirai, Kawagoeshi, Saitama 350-8585, Japan. wlooifang@yahoo.com
Abstract:
This paper evaluates the potential for regional bioenergy recovery as electricity and heat by small-scale methane fermentation systems from organic waste matter generated from urban, industrial, and agricultural sectors. Biogas production functions of high-strength organic wastes are derived from data of implemented methane fermentation systems. The distributions of organic wastes from sewage, household, wholesale/retail, manufacturing, farming, and livestock activities in the Tokyo Bay region are calibrated into a disaggregated spatial database by compiling general activity statistics and emission intensity parameters using Geographic Information System (GIS). Three scenarios of organic matter circulation by co-digestion in sewage treatment plants (STPs) are designed and assessed. Surplus electricity and heat from methane fermentation systems are used for STP operations and household demand. The spatial database allows a preliminary examination for the suitability of locations for technology implementation from the aspects of bioenergy supply and balance. The results show that an additional 368,000-1,328,000 MW of electricity would be generated, and 1300-3600 TJ of heat could be used by households, reducing the annual emissions of CO2 from fossil fuels by 307,000-798,000 t.
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