This paper focuses on the evaluation of CO2 emission reductions that can be achieved by implementing integrated methane fermentation systems in sewage treatment plants (STPs) as a municipal organic waste recycling scheme in Tokyo Bay Region. Target organic wastes are sewage/sanitary sludge (simplified as sewage sludge in the following article due to the insignificant quantity of sanitary sludge in STPs), food wastes from household, food distribution and manufacturing sector, livestock excreta and agriculture waste. Geographical Information System (GIS) is utilized to develop a database platform which provides spatial and attribute data on the flow of organic waste matters. Two cases designed for evaluations are differentiated by the types of organic wastes and different organic wastes collecting boundaries.
This paper focuses on an evaluation system for municipal solid waste recycling strategies with the consideration of local environmental policy options and the industrial collaborations for conversion technologies. MSW recycling strategies in Kawasaki City are planned based on the options on the types of wastes to be circulated especially by local manufacturing industries and the numbers of incineration plants. It is identified that paper, steel and cement industries located in Kawasaki Eco-town can recycle mix papers , waste container and packaging plastics, methane fermentation residues and incineration ashes. Eight future policy scenarios in 2015 are planned, and environmental impacts of local recycling ratio, quantity of landfilled incineration ashes and CO2 emissions are evaluated. The results showed that , in maximum, local recycling ratio can increase by 10%, landfilled incineration ashes can have a reduction of 13 thousand ton , and 53 thousand ton of CO2 emissions can be reduced annually.
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