| 摘要 |
PROBLEM TO BE SOLVED: To provide a filtration device where fine particles adhered with radioactive substances such as cesium and the like and harmful substances such as heavy metals and the like such as hexavalent chromium and the like do not adhere to a filter as much as possible even when the fine particles are mixed and then the fine particles can be efficiently removed.SOLUTION: In a filtration device,: a plurality of storage tanks K (K1, K2 ... K12) storing treatment water sequentially flown down from an upstream side toward a downstream side are continuously disposed through partition walls 2; filters F are disposed on the way from the storage tank K at the upstream side to the adjacent storage tank K at the downstream side; and a pretreatment tank 10 in which a coagulant coagulating fine particles in the treatment water is charged into the treatment water and agitated before the storage tank K1 at an uppermost upstream end since the treatment water is supplied to the storage tank K1 at the uppermost upstream end and continuous filtration is performed by flowing down the treatment water. Filters F are formed with a net-like member and the meshes of the filters F (F1, F2 ... F12) are made sequentially finer from the upstream side to the downstream side.SELECTED DRAWING: Figure 2 |
