摘要 |
PROBLEM TO BE SOLVED: To solubilize digested sludge at low cost while stably maintaining microorganism reaction in a digestion tank. SOLUTION: In a sludge digestion method for anaerobically digesting organic sludge 10 to be treated, in the digestion tank 12, a part of the digested sludge is pulled out from the digestion tank 12, and the pull-out digested sludge 18 is preliminarily oxidized in an oxidation tank 20 in a first process. The digested sludge 18 after the first process is introduced into a solubilization tank 24 in a second process, and chlorine dioxide 26 is added to the solubilization tank 24 to solubilize the digested sludge 18. The digested sludge 18A after being solubilized is returned to the digestion tank 12. COPYRIGHT: (C)2007,JPO&INPIT
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