抄録
The production of bio diesel fuel(BDF) has been carried out nationwide as one method of recycling of used cooking oil. In general, the manufacturers of BDF are schools, NPO groups, and small and medium-sized enterprises, etc. However, the quality of BDF is hardly ever reported. Therefore, concentrations of fatty acid methyl ester (FAME), triglyceride, organic acids, methanol and acid number in BDF produced by used cooking oil in Kumamoto district were measured during a three-year period. In this investigation, the measurement methods adopted in the light oil compulsion standard were improved to ensure high precision. The concentrations of organic acids, methanol and acid number were lower than those of the standards. The average concentrations of FAME and triglyceride in BDF were 91.0 % and 2.5 % respectively. However, there were no serious problems due to the use of the BDF as a fuel for a diesel engine. Moreover, questionnaires concerning BDF manufacturing methods were distributed to BDF manufacturers.
