| 摘要 |
PROBLEM TO BE SOLVED: To take out a sand component in dredged earth and sand efficiently by reduced energy to obtain the high quality sand component at a high recovery rate. SOLUTION: A rough classification means 21, which separates dredged muddy water wherein dredged earth and sand containing the sand component and water are mixed into coarse particles and fine particles, is provided to a mud feed pipeline through which the muddy water is transported by a pump, and the muddy water stream in the pipeline is separated into muddy water low in sand content and muddy water high in sand content by the classification means. The separated muddy water low in sand content is sent to a sedimentation treatment basin 27 as it is while the muddy water high in sand content is sent in a classification treatment pipeline separate from the pipeline of the muddy water low in sand content, and a diluting water mixing means 23 is provided on the way of the pipeline. The mud feed pressure of the muddy water high in sand content is utilized by the means 23 to suck diluting water into the pipeline to mix the same with the muddy water, and the diluted muddy water high in sand content is sent to a sedimentation classification tank 22. The coarse particles are sedimented in the sedimentation classification tank 22 while the fine particles are allowed to flow along with water to separate the sand component. COPYRIGHT: (C)2004,JPO
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