Dry Methane Fermentation of Municipal Waste with Various Composition (Part 1)

——Characteristics of Mesophilic Fermentation——

Abstract

Characteristics of dry methane fermentation were studied with various composition ratio of kitchen wastes and paper wastes on a wet basis, Run A (60%, 40%), Run B (68%, 32%) and Run C (82%, 18%), using digesters with an effective volume of 2 liters maintained at a mesophilic temperature of 37°C. Methane gas yields of Run A, Run B and Run C were 0.24L/gVS, 0.24L/gVS and 0.26L/gVS, respectively. In Run C, in which the loading rate of kitchen waste was the highest among the three runs, methane gas yield was higher than that in Run A or B since kitchen waste is an easily degradable organic waste. The maximum loading rate of kitchen waste and paper waste, which does not cause acute inhibition of methanogenesis, was 5gVS/(kgsludge·day) regardless of their composition ratio.