ANAEROBIC DIGESTION METHOD FOR ORGANIC WASTE LIQUID

摘要

PURPOSE:To effectively execute anaerobic digestion reaction by allowing acid forming bacteria gorups and immobilized methane forming bacteria groups fixed to a high- polymer gel, etc. to mixedly exist in one tank and a naerobically treating org. waste liquid while bringing these groups into contact with the org. waste liquid. CONSTITUTION:The acid forming bacteria groups 6 and the immobilized methane forming bacteria groups 3 fixed to the high-polymer gel or porous inorg. carrier are made to mixedly exist in one fermentation tank 1 and the org. waste water is anaerobically treated while these bacteria groups are brought into contact with said liquid to convert the org. materials to gaseous methane and carbon dioxide. Namely, the bacteria can be maintained in the fermentation tank while the physiological activity is maintained by immobilizing and using the methane forming bacteria groups contribut ing to the methane formatino reaction which is the rate-determining step in the anaero bic digestion. The treatment of the waste org. liquid is thus efficiently executed and the amt. at which SS occurring in the bacteria flow together with the treated liquid to the outside of the system is decreased. Contribution is made to the improvement of the quality of the treated water as well. Since the holding of the bacteria is easy, the method is usable for the treatment of waste liquid having a low concn. of org. materials.