Water body heavy metal polluted sediment in-situ covering and repairing method

Abstract

The invention discloses a water body heavy metal polluted sediment in-situ covering and repairing method. The water body heavy metal polluted sediment in-situ covering and repairing method is characterized in that at least one layer of a first covering layer, a second covering layer and a third covering layer is sequentially arranged on polluted river sediment or a river slope from bottom to top; filler in the first covering layer is a mixture of cerium modified zeolite and zero-valent iron; filler in the second covering layer is selective heavy metal curing filler; filler in the third covering layer is mixed filler of activated carbon and sand; a water body can be divided into a shallow water slow flowing water body, a deep water body and a torrent water body according to the depth and the flowing speed of the water body by the three covering layers, and the shallow water slow flowing water body, the deep water body and the torrent water body can be selectively combined. The water body heavy metal polluted sediment in-situ covering and repairing method disclosed by the invention aims at different sediment pollution situations; a covering body combines physical, chemical and biological repairing measures together through a way of stacking different structure layers up and down, so that sediment pollution is efficiently removed or reduced, and the covering layers and heavy metals adsorbed thereby can be well recycled.

Description

technical field [0001] The invention relates to a method for quickly polluting bottom mud with heavy metals in water, which can remove heavy metals in bottom mud and improve the ecological environment of water bodies, and belongs to the technical field of bottom mud pollution restoration. Background technique [0002] When point source pollution in the river basin is controlled and water pollution is effectively treated, the water quality will gradually improve. However, during the industrial development period, some water sediments accumulate heavy metals for a long time, forming a source of water pollution. Even if the water quality of the water body is improved, the heavy metals accumulated in the sediment will gradually be released to the overlying water due to the change of the environmental conditions of the sediment, resulting in secondary pollution of the water body. At present, the treatment of polluted sediment in rivers and other water bodies is mainly divided int...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low restoration efficiency and high ecological risk of heavy metals sealed in the overburden layer existing in the existing in-situ physical covering treatment technology, the present invention proposes a flexible and efficient in-situ covering restoration method for heavy metals in water body sediment

Images