River/lake heavy metal pollution sediment in-situ coverage method and device

Abstract

The invention provides a river / lake heavy metal pollution sediment in-situ coverage method and device. The method comprises the following steps: adding iron tailings to the surface layer of polluted sediment, evenly mixing, adding cement to the surface layer of the sediment, and evenly mixing to form a solidified coverage layer. The coverage device at least comprises two coverage units, wherein the coverage units are connected together in series; every two adjacent coverage units are connected together through a connecting frame which is connected with an undercarriage through a hydraulic cylinder; and each coverage unit comprises a frame, a fixed plate, a turnover board, an electric mixer and a feed port. By using iron tailing grains and cement as the coverage material, the invention caneffectively fix the heavy metals, lower the consumption of the coverage material, avoid reducing the effective volume of the river or lake due to excessive addition of the coverage material, effectively prevent the sediment from resuspension, effectively prevent the sediment pollution on the deep layer from releasing to the overlap water body, and reduce the adverse effect of the treatment process on the overlap water body.

Description

technical field [0001] The invention relates to an in-situ covering method and device for treating heavy metal-contaminated bottom mud in rivers, and belongs to the technical field of contaminated bottom mud restoration. Background technique [0002] Once the water body is polluted by heavy metals, the heavy metals tend to deposit into the sediment along with the fine suspended matter in the water body. [0003] The heavy metal pollutants accumulated in the sediment are not fixed. When the pH, water temperature and other conditions change, the heavy metals are released and enter the water body again to cause secondary pollution. Therefore, the remediation of heavy metal contaminated sediment is an urgent problem to be solved. [0004] In-situ covering technology was applied to the restoration of contaminated sediment in the late 1970s. Compared with traditional controlled natural restoration technology and dredging technology, it has good restoration effect, less ecological...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the deficiencies in existing heavy metal-contaminated sediment covering technology in rivers, and provides an in-situ covering method for heavy metal-contaminated sediment in rivers and lakes that is less affected by the flow velocity of the water body and has good covering effect, and at the same time provides a method for realizing the method, In-situ covering device for heavy metal polluted sediment in rivers and lakes without affecting the turbidity of overlying water and avoiding sediment suspension

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