Structure capable of being used for treating heavy metals in bottom mud dredging tail water and construction method thereof

Abstract

The invention discloses a structure that can be used for treating heavy metal pollutants in tail water of sediment dredging, including a sedimentation tank and a reaction tank, the reaction tank includes an adjustment column and at least one adsorption column, and the adjustment column and the adsorption column both adopt grids The mesh cage is used as a frame, and the regulating column is filled with solid particle filler, and the adsorption column is filled with a composite composed of Fe3O4-calcium alginate-Phanerochaete chrysosporium microspheres; and the regulating column and the adsorption column are arranged along the direction of water flow in sequence. The construction of the structure includes the following steps: build the sedimentation tank and the reaction tank, excavate more than two grooves in the reaction tank, and place the grid cage in each groove vertically to the direction of water flow; Fill the solid particle filler in the groove, and fill the composite bioabsorbent material in the remaining grooves, and ensure that the filler is higher than the water level line of the reaction tank. The invention has the advantages of low cost, simple preparation process, high adsorption efficiency, etc., and can be used for treating heavy metal pollutants in tail water of sediment dredging.

Description

technical field [0001] The invention belongs to the field of water body purification and water pollution prevention and control, and in particular relates to a structure which can be used for treating heavy metals in tail water of sediment dredging and a construction method thereof. Background technique [0002] With the rapid development of industry and the sharp increase of human activities, industrial sewage and industrial waste, urban and rural domestic sewage, and residues of chemical fertilizers and pesticides in agricultural production are directly discharged into lakes and rivers with little or no treatment, resulting in serious water pollution. `. In the urban water system closely connected with people's life, the content of heavy metals, eutrophication and other harmful chemical substances far exceeds the allowable value, which poses a great threat to the urban environment and people's life and health. The experience of treating polluted water systems at home and ...

AI Technical Summary

Problems solved by technology

The tailwater of the storage yard contains nitrogen, phosphorus, organic pollutants and heavy metal pollutants. Most of these pollutants adhere to the suspended particles and are discharged into the receiving water body with the remaining water, which will cause secondary pollution of the receiving water body. The specific gravity of suspended particles is small, it is difficult to settle and remove in a short time, and the unit output of dredging projects is large, and the storage yard space is limited. Tail water treatment has become a restrictive factor for the normal operation of environmental protection dredging projects

[0004] When the traditional tail water treatment method is adopted, the tail water treatment effect is poor, and when the capacity of the spoil field is insufficient, a large amount of silt filled with the tail water will be discharged directly with the tail water. It will cause environmental pollution, and the normal and continuous construction will not be possible in the later stage, and will increase a lot of construction costs

At the same time, it will cause pollution to the surrounding breeding and rivers, and the policy processing costs are high

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