In-situ remediation system and method combining sediment heavy metal pollution treatment with dehydration and solidification

Abstract

The invention discloses an in-situ remediation system and a method which are for combining sediment heavy metal pollution treatment with dehydration and solidification. The in-situ remediation systemcomprises an EKG drainage plate, a drainage branch pipe, a drainage main pipe, a vacuum water-gas separator, an electrode connecting circuit, a vacuum pump, a water suction pump and a heavy metal treatment reagent adding system; a base plate of the EKG drainage plate is inserted into the bottom mud; the vacuum gas-water separator is provided with a water inlet, a gas suction opening, and a water suction opening; the water inlet is detachably connected with the drainage main pipe; the gas suction opening is connected with the vacuum pump through a pipeline; the water suction opening is connected with the water suction pump; the heavy metal treatment reagent adding system comprises a container containing a reagent and a reagent pump, the container is connected with the input end of the reagent pump through a pipeline, the output end of the reagent pump is connected with the main drainage pipe, and the bottom mud to be treated is sequentially covered with a sand cushion layer, a geotextile layer and a vacuum sealing film layer from bottom to top. Continuous drainage in heavy metal bottom mud treatment is achieved, the bottom mud curing period is shortened, the bottom mud reinforcing effect is improved, and the curing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of sediment heavy metal pollution control and dehydration and solidification. Background technique [0002] Unlike organic matter, heavy metals cannot be degraded by microorganisms and can be enriched in organisms, so heavy metal pollutants are potentially harmful. Bottom mud, which is formed by mixing sediment, clay, organic matter and various minerals, is deposited at the bottom of the water body through a series of physical, chemical, biological, and water transport processes. Once heavy metals enter the water body, they can be enriched in the surface sediment of the river bed through adsorption, complexation, and precipitation. . The heavy metals in the sediment are irreversible and long-term. When the environmental conditions change, some heavy metals may be released from the sediment through desorption, dissolution, redox, etc., which will increase the concentration of heavy metals in the water solut...

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Problems solved by technology

[0002] Unlike organic matter, heavy metals cannot be degraded by microorganism...

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