Study on Regional Bioresource Utilization and Recycling System in a Case of Saku City, Nagano Prefecture, Central Japan

Abstract

In order to present a model of regional bioresource utilization and recycling system in medium-scale local city, amount of potential bioresource supply was estimated in Saku City, Nagano Prefecture, Central Japan. Potential supply of 1) woody resources, 2) agricultural residues and livestock wastes and 3) garbage and human wastes were estimated by using GIS and statistical data. The degree of self-sufficiency of lumber used in timber construction in the city was estimated to be 30% with sustainable forest management. It was also estimated that 63% of domestic heat energy use would be supported by woody biomass energy and biogass generated from livestock wastes, garbage and human wastes. In addition, manure made from residues generated after methane fermentation would support more than 100% of total nitrogen input to the agricultural lands. Based on these results, an example of regional bioresource recycling system model was presented and feasibility of the system was discussed in relation to current status of bioresource utilization in Saku City.