JP2631211B

PURPOSE:To generate a high-calorie gas with high efficiency by deproteinizing blood stock, etc., methane-fermenting the stock, circulating the generated gas to agitate the methane-fermentation soln., and removing ammonia and hydrogen sulfide in the course of circulation. CONSTITUTION:Acetic acid, etc., are added to the blood stock or meat stock generated from the aquatic food processing to coagulate and separate protein. When the deproteinized soln. is methane-fermented in a methane fermenter 1, the methane fermentation soln. 5 is agitated by circulating the generated gas. Ammonia is removed by the sulfuric acid 3 in a sulfuric acid tank 22 in the course of circulation, and hydrogen sulfide is removed by the iron oxide 4 in an iron oxide-packed vessel 23. As a result, the blood stock or meat stock which has been difficult to normally methane-ferment heretofore can be used as the raw material in this method, a high-calorie gas can be stably generated with high efficiency from the material, and the separated and recovered protein can be used as a high-quality feed stuff.