METHOD FOR DESULFURIZING FERMENTATION GAS AND APPARATUS THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method for desulfurizing a fermentation gas with which the frequency in exchanging or regenerating a sulfurizing reactant is low without requiring the regulation of pH and to provide an apparatus therefor. SOLUTION: The apparatus is equipped with a fermenter 10 for carrying out methane fermentation of an organic raw material 12, a desulfurizer 20 designed to bring the resultant fermentation gas 14 produced in the fermenter 10 and containing hydrogen sulfide into contact with an immobilized carrier 24 for a sulfur bacterium in the liquid phase under anaerobic conditions and then pass the obtained gas through a packed bed 37 of iron oxide pellets which are the sulfurizing reactants and biological treating equipment 40 for biologically treating an effluent 19 from the fermenter 10 under aerobic conditions. The treated liquor in the biological treating equipment 40 is fed from a pipeline 46 to the liquid phase of the desulfurizer 20 and then returned through a pipeline 47 to the inlet side of the biological treating equipment 40. COPYRIGHT: (C)2004,JPO