A method for ecological restoration of river polluted sediment

Abstract

The invention relates to a river pollution bottom sediment ecological remediation method. A bottom sediment stacking region is arranged at a river bank side, anti-seepage treatment is carried out on the bottom and the periphery of the bottom sediment stacking region, bottom sediments dug from a river and polluted by heave metals are added with a curing agent and are stacked in the bottom sediment stacking region; a separation region is arranged between the bottom sediment stacking region and a river water flow passage, and at least one separation wall is arranged in the separation region; an in-situ covering region is arranged in the dredged river water flow passage, first covering layers are laid at both the bottom of the separation region and the bottom of the in-situ covering region, a second covering layer and a third covering layer are also arranged on the first covering layer of the in-situ covering region, a filler of the first covering layer is a mixture of clay and the curing agent, the second covering layer is formed by sand grains, and the third covering layer is formed by pebbles and natural zeolite. According to the river pollution bottom sediment ecological remediation method disclosed by the invention, not only can the heavy metals in the bottom sediments be adsorbed, but also water can be accumulated, and a landscape function of the river is promoted; an in-situ remediation technology not only can prevent release of bottom sediment pollutants, but also can improve a water quality purification function of the river.

Description

Background technique [0001] Heavy metal pollution in river sediments has become a major environmental problem in my country. Heavy metals enter the water body through atmospheric deposition, wastewater discharge, rainwater leaching and scouring, and then deposit into the sediment through adsorption, complexation, and precipitation. When environmental conditions change, heavy metals can easily enter the water body again, forming secondary pollution. At the same time, the main living place and food source of benthic organisms is also the bottom mud, so the heavy metals in the bottom mud not only have toxic and harmful effects on the benthic organisms or the organisms in the overlying water, but also have bioaccumulation through the food chain. , and further affect human health. Many river sediments at home and abroad are seriously polluted by heavy metals, and it is imminent to effectively reduce the heavy metal pollution in river sediments. At the same time, it is of great si...

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Problems solved by technology

[0004] Aiming at the problems that the current in-situ remediation technology of heavy metal contaminated sediment still has the risk of release in solidification and storage, and the ex-situ treatment technology has complex treatment processes, high transportation costs for dredged sediment, difficulty in finding a storage site, and the risk of secondary pollution, the present invention is based on Combining in-situ restoration and ex-situ treatment, a river channel with low cost, no risk of re-release of heavy metals, no need to occupy new sludge dumps, good restoration effect, and both water purification and landscape functions is proposed. Ecological Restoration Method of Contaminated Sediment

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