| 摘要 |
PROBLEM TO BE SOLVED: To enhance methane fermentation efficiency and activated sludge treatment efficiency by increasing the retention amount of bacterial cells in the treatment system, also, to efficiently remove even hardly-decomposable organic matter and further to improve properties with respect to separation, dehydration and composting, of organic sludge. SOLUTION: The treatment using this equipment comprises: concentrating organic sludge, together with excess sludge from a sedimentation vessel 4 in a latter stage, by a concentration/separation means 7; subjecting the concentrated sludge to methane fermentation in a methane fermenter 1; dehydrating the methane-fermented sludge by a dehydrator 2; treating a liquid separated by the dehydrator 2, together with a liquid separated by the concentration/ separation means 7, with activated sludge, in an aeration vessel 3; thereafter, subjecting the resulting treated liquid to solid-liquid separation in the sedimentation vessel 4; also, carbonizing dehydrated cake obtained by dehydrating the methane-fermented sludge, with a carbonization device 8 to obtain a carbonized material; and adding the carbonized material to an aeration vessel 3.
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