| 摘要 |
PROBLEM TO BE SOLVED: To purify oil and fat-containing wastewater with high efficiency and efficiently recover energy from organic components in the wastewater; to realize the stabilization of methane fermentation treatment, the improvement of treatment efficiency, the downsizing of a methane fermentation tank, the improvement of separation efficiency of oil and fat from the oil and fat-containing wastewater, the volume reduction of generated sludge, and the like. SOLUTION: After the oil and fat-containing wastewater is coagulated in a coagulation reaction tank 2, it is subjected to pressure floatation treatment in an oil-water separation tank (a pressure floatation tank) 3. The water treated by pressure floatation is subjected to biological treatment in an acid production tank 4, a high-load anaerobic treatment tank 5, and an aerobic treatment tank 6, and then subjected to solid-liquid separation in a sedimentation pond 7. Pressure floatation sludge is subjected to methane fermentation treatment in the methane fermentation tank 8, and then dehydrated by a sludge dehydrator 9. Surplus anaerobic sludge and/or surplus aerobic sludge in the biological treatment processes are introduced into the methane fermentation tank 8. The surplus anaerobic sludge and surplus aerobic sludge in the biological treatment processes, and surplus digested sludge in the methane fermentation tank 8 are introduced into the coagulation reaction tank 2. COPYRIGHT: (C)2006,JPO&NCIPI
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