METHOD OF REMOVING SEDIMENT IN WATERWAY

To develop a method for removing sediment in a waterway capable of sucking up water containing the sediment from the inside of the waterway in which the water is flowing and treating it easily, and capable of being performed quickly and effectively with a small-scale facility.SOLUTION: Provided is a method for removing sediment in a waterway without draining water in the waterway. The sediment has coarse contaminant such as shells and other contaminants including coarse and fine particles such as fragments of shells and sludge other than the coarse contaminant. The method for removing the sediment in the waterway in which a polymer coagulant/precipitation agent is added to water containing the sediment in the waterway prior to classifying and separating the coarse contaminant by using a sieve opening of a mesh in a sorting process of the coarse contaminant. The method has: the sorting process of sucking up the water containing the sediment from the inside of the waterway by a pump and classifying and separating the coarse contaminant by using the sieve opening of the mesh; and a solid-liquid separation process of introducing water containing residual sediments which are other contaminants after separating the coarse contaminant in the sorting process, into a facility for precipitate treatment, precipitating the residual sediments in the facility, and separating the residual sediments from the water.SELECTED DRAWING: Figure 1 【課題】水が流れている水路内から堆積物を含む水を吸い上げて簡便に処理でき、しかも小規模な設備で迅速且つ効果的に行うことができる水路内堆積物の除去方法の開発。【解決手段】水路内堆積物を水路内の水を抜くことなく除去する方法であり、堆積物は、貝殻等の粗大夾雑物と、該粗大夾雑物以外の、貝殻の破片やヘドロ等の粗粒と微粒とを含むその他の夾雑物を有し、水路内からポンプで堆積物を含む水を吸い上げて、粗大夾雑物を網の目開きを利用して分級して分離する分別工程と、該分別工程で粗大夾雑物を分離した後の、その他の夾雑物である残留堆積物を含む水を沈殿物処理用の設備内に導入し、残留堆積物を前記設備内に沈降させ、残留堆積物と水とを分離する固液分離工程を有し、粗大夾雑物の分別工程で、網の目開きを利用して粗大夾雑物を分級して分離するよりも前に、水路内堆積物を含む水に高分子凝集・沈降剤を添加する水路内堆積物の除去方法。【選択図】 図１