A STUDY OF RICE STRAW RECYCLING SYSTEM BY THE ANAEROBIC CO-DIGESTION WITH SEWAGE SLUDGE

Abstract

 Rice straw recycling system by anaerobic co-digestion was investigated by a questioner survey using conjoint analysis in Kaga city. The result of conjoint analysis showed that “Amount of collection work” was a most important factor for cooperation to a system. “The storage space” and “The price of sewage sludge manure” were next factors. On the other hand, the factor of “The price of rice straw” was minimum. The reason of this result was that 77% of responders are elderly people (older than 60 years old) disliking workload increase. In addition, the result of questioner survey showed that 71% of farmers have tendency to use the recycling system with some kind of benefits.