Abstract
Material and energy balance in a dry methane fermentation facility were estimated using data from four years of operation. Input waste was source-separated food waste and waste paper from households and commercial sectors. Residents were asked to separate their food waste in biogas-collection bags prior to disposing. Based on a composition analysis, the rate of separation into biogas-bags was estimated to be 78.6 % for food waste and 45.6 % for waste paper. Participation rate of residents in this project was estimated to be 65.3 %. An analysis of weekly data shows that the biodegradation rate for the food waste is slightly higher than that of the waste paper. In this facility, waste is being heated by injecting steam into recirculated sludge. Heat loss was found to be very small in the summer time, and average loss in the first two years accounted for 40 % the heat provided by steam input.
