| 摘要 |
PROBLEM TO BE SOLVED: To provide a methane fermentation apparatus capable of efficiently performing methane fermentation treatment of solid organic wastes without dilution. SOLUTION: A solid organic waste A is methane-fermented by dividing an anaerobic fermentation vessel 2 storing a fermentation solution L into the upper and lower portions with a porous partition plate 3, charging the waste A above the partition plate 3, drawing the fermentation solution L from the bottom below the partition plate 3 through a reflux passage 10 equipped with a pump 11 and circulating the fermentation solution L to the top above the partition plate 3 through the outside of the fermentation vessel 2. In the bottom of the fermentation vessel 2, there is arranged an overflow passage 15 which causes the fermentation solution L to rise up to the height h corresponding to the liquid level outside the fermentation vessel 2 so as to overflow. More preferably, a fixed bed 20 of an anaerobic microorganism penetrable for the fermentation solution L is disposed below the partition plate 3 in the fermentation vessel 2. A stirring means 30 for the organic waste A may be arranged above the partition plate 3 or on the partition plate 3 in the fermentation vessel 2. COPYRIGHT: (C)2007,JPO&INPIT
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