| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for purifying bottom sediment in a closed water area which can be carried out at a low cost without exerting a bad influence on the ecosystem of a lake or the like. SOLUTION: The surface layer of bottom mud 2 in the closed water area, such as a lake and an inner bay, is covered with a crushed shell material 4 made by crushing shells into the shape of sand or with a layer where sea sand, river sand, pit sand and/or dredge soil, etc. are mixed with the crushed shell material 4. After adsorbing pollutants in the bottom mud 2 and in water W<SB>L</SB>near the mud by the crushed shell material 4, the crushed shell material 4 or the layer where the sea sand, the river sand, the pit sand and/or the dredge soil, etc. are mixed with the crushed shell material 4 is covered with a sand cover material 5 comprising the sea sand, the river sand, the pit sand and/or the dredge soil, etc. COPYRIGHT: (C)2005,JPO&NCIPI
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