| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a slurry circulation type coagulation and sedimentation treatment device capable of maintaining the slurry interface level of a sedimentation part at an appropriate position even when raw water turbidity is low or when sedimentation property of a flock varies depending on the raw water turbidity and efficiently obtaining treated water from the raw water of the low turbidity, and its operation method. Ž<P>SOLUTION: The slurry circulation type coagulation and sedimentation treatment device has a slurry circulation type coagulation and sedimentation treatment tank including an agitation part 3, a water path part 4, a sedimentation part 5 and a flow path for returning slurry from the lower part of the sedimentation part 5 to the agitation part 3. The device is provided with a solid particle adding pump 12 for supplying solid particles for increasing the specific gravity of the slurry to raw water 17, an SV meter 15 for detecting the SV value of the slurry, a slurry interface meter 16 for detecting the position of the slurry interface 23 of a slurry blanket 22 formed in the sedimentation part 5, and a sludge pump 11. The SV value and the slurry interface position and the time change of each of the SV value and the slurry interface position are calculated, and the supply amount of the solid particles and/or a slurry discharge amount is instructed according to the calculated result. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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