| 摘要 |
PROBLEM TO BE SOLVED: To lower the water content ratio of treated soil by suppressing the fluidity of primarily treated soil and at the same time heightening dewatering efficiency in secondary treatment. SOLUTION: The slurry treatment facilities 1 are provided with an earth and sand-separating apparatus 2 a liquid cyclone 3 installed in the earth and sand-separating apparatus 2, a slurry tank 6 in which the over muddy water of the liquid cyclone is mixed and stirred with a flocculant supplied from a PAC tank 5, and a filter press 7 for pressurizing and dewatering flocculated and precipitated matter discharged out of a slurry tank. Coarse particle matter, for example coarse particle of 500μm or larger, having a larger diameter than fine sand is sorted and separated from discharged muddy water to give primarily treated soil by the earth and sand-separating apparatus 2 and the liquid cyclone 3 and fine particle matter having a smaller particle diameter than the coarse particle, that is fine particle matter with smaller than 500μm, is flocculated and precipitated to give secondarily treated soil by mixing and stirring the resultant discharged muddy water after the sort and separation with a flucculant in the slurry tank 6.
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