| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for efficiently reducing excess sludge produced in the treatment of organic sewage. SOLUTION: In the sludge reducing device, a cavitation generation device is disposed in the middle of a pipe extended from a sedimentation tank to an aerobic biological treatment tank and a solubilization device for solubilizing excess sludge by cavitation generated in the cavitation generation device is disposed, wherein the cavitation generation device is composed of: a transfer pressure pump; a funnel type shock wave generating pipe which becomes thicker on the downstream side; a pipe for crushing microorganism connected to the shock wave generating pipe; and a low pressure generation facilitating plate disposed between the shock wave generating pipe and the pipe for crushing microorganism. COPYRIGHT: (C)2007,JPO&INPIT
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