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Utilization of kitchen waste as biomass resources has been of growing importance in urban areas of Japan. Present-day standards have set much sterner target recycling rates especially for kitchen waste from food industry, e.g. restaurants and food retail dealers. Aiming at high-efficiency energy recovery from kitchen waste, we have developed a two-step anaerobic fermentation system for generating hydrogen and methane. Biohydrogen is produced in the initial fermentation step by thermophilic microbiota mainly consisting of Clostridium species. Then, residues such as organic acids are converted into bio-methane in the second methane fermentation step. By proficiently combining these two fermentation steps, high system efficiency can be achieved. Optimum operating conditions have been found in the laboratory test of hydrogen fermentation operated over 300 days using artificial kitchen waste.

Development of An Anaerobic Hydrogen and Methane Fermentation System for Kitchen Waste biomass Utilization