METHOD FOR ANAEROBIC DIGESTION OF ORGANIC WASTE LIQUID AND ANAEROBIC DIGESTION DEVICE

摘要

PPROBLEM TO BE SOLVED: To effectively reduce the volume of anaerobic digestion sludge generating when an organic waste liquid is treated by methane fermentation in the presence of sludge containing anaerobic microorganisms. PSOLUTION: After the digestion sludge from an anaerobic digestion tank 1 is drawn and heated to 60C in a sludge solubilizing tank 3 to preferentially solubilize the organic component, the sludge is subjected to solid liquid separation to obtain separated sludge with an increased proportion of the inorganic component, which is then discharged as an excess sludge to the outside of the system. The separated liquid is returned to the anaerobic digestion tank 1. Or, the organic waste water to be introduced into the anaerobic digestion tank 1 is preliminarily heated to 60C in a raw water solubilizing tank. PCOPYRIGHT: (C)2003,JPO