| 摘要 |
PROBLEM TO BE SOLVED: To provide a recovery method for an underwater suspended substance, capable of recovering quickly and easily the underwater suspended substance at a high recovery rate, from various kinds of environmental water and water discharge effluents or the like. SOLUTION: Water is made to flow from the outermost layer side in one side of a filter to the outermost layer side in the other side, by using the filter having a diatomaceous earth layer, comprising two layers or more with average particle sizes of diatomaceous earth packed in the respective layers that is reduced in order along, as going from the outermost layer on the one side toward the outermost layer on the other side. The diatomaceous earth layers, comprising the two layers or more, is preferably formed of two layers of an upper layer and a lower layer, or three layers of an upper layer, an intermediate layer and a lower layer; the diatomaceous earth is packed to make the average particle size get large, in the order of the upper layer and the lower layer, or in the order of the upper layer, the intermediate layer and the lower layer; and the water is made to flow from the upper layer side to the lower layer side. COPYRIGHT: (C)2008,JPO&INPIT
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