Using the RCF facility, the following two tests were conducted from July 2007 to February 2008: (1) test of biogas refining using the RCF facility and (2) test of utilization of refined gas by gas equipment. Items measured were the concentration of methane, carbon dioxide and nitrogen in the raw biogas and refined gas, and the amount of refined gas produced after refining. For utilization tests of refined gas, we tested gas tables (IC3300CB2) and CNG trucks (ABF-SYE6T ([revised]) and measured the amount of refined gas consumed. Comparing the gross caloric value of liquefied petroleum gas (LPG) with refined biogas, we see that the value for LPG is 100.5 MJ/Nm3compared to 38.6-39.1 MJ/Nm3 for refined biogas, or roughly 40 % of LPG. Therefore, we enlarged the nozzle diameter of the gas equipment to maintain the same degree of combustion capability as LPG during usage. The results of the combustion tests show that the area near the combustion had concentrations less than 0 ppm CH4 and 0-10 ppm CO, which were similar to that of LPG during combustion. The average amount of refined gas used by gas ranges was 0.41 Nm3/day (150 Nm3/yr). In addition, we tested the operation of CNG trucks under the conditions of 94 km as the usage distance of refined gas and an average speed of

56.4 km/h. The results show that the fuel consumption rate of the refined biogas was

10.6 km/Nm3. Fuel consumption was almost the same as with commercial CNG.