| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for reducing a water content in dewatered sludge that achieves performance similar to a highly efficient dewatering centrifuge namely having the water content of the dewatered sludge of 82% using a conventional standard dewatering centrifuge. SOLUTION: It has been found that using the conventional standard dewatering centrifuge having a differential design value of 3.0 to 6.0 rpm, when a supply amount of the solid content of the sludge is increased, a load is provided to an inner cylindrical screw conveyer, a differential electric current value is controlled at 0.4 to 0.5 A and centrifugal dewatering is carried out at a differential velocity of 1.5 to 2.0 rpm, the water content of the dewatered sludge can be reduced to about 83%, and further by making a loading rate of a liquid-type polymer flocculant into 1.3 to 2.0%, the water content of the dewatered sludge is reduced to about 82% and an SS recovery rate of 95% or larger can be achieved. COPYRIGHT: (C)2006,JPO&NCIPI
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