METHANE FERMENTATION SYSTEM AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a methane fermentation system which performs fermentation in an allowable pH range suitable for methane fermentation and reduces the production rate of a solubilized residue and methane fermentation sludge. SOLUTION: The methane fermentation system is provided with a first solubilizing tank 3 for solubilizing organic waste, a first dehydrator 5 for separating first solubilized material produced in the first solubilizing tank 3 into first solubilized liquid and first solubilized residue, a second solubilizing tank 22 for adding alkali to the first solubilized residue and for solubilizing the same, a second dehydrator 27 for separating second solubilized material produced in the second solubilizing tank into second solubilized liquid and second solubilized residue and a methane fermentation tank 10 for subjecting the solubilized liquid made by mixing the first solubilized liquid and the second solubilized liquid to methane fermentation. In addition, the methane fermentation system is provided with a controller 33 for measuring pH 32 in a first storage tank storing the first solubilized liquid and for controlling the flow rate 31 of the second solubilized liquid in accordance with the result. COPYRIGHT: (C)2004,JPO