Stirring device for in-situ remediation of heavy metal contaminated soil for solidification and stabilization

Abstract

The invention discloses a stirring device for in-situ remediation of heavy metal contaminated soil solidification stabilizer. The stirring device comprises a remediation main body, and a stirring device, a liquid storage device, a dehydration device, a transmission device and a suction device are arranged in the remediation main body; through cooperation of the stirring device and the liquid storage device, soil enters the stirring device and then is sequentially subjected to kneading, water jet cutting and pulping, so that the soil is promoted to rapidly form uniform slurry, the solidification effect of heavy metal is improved, and a solidification agent solution is automatically supplemented through the liquid supplementing device; by cooperation of the dehydration device, the slurry scraping device, the transmission device and the suction device, the slurry is subjected to suction filtration, the purposes of recovering a curing agent solution and separating heavy metals are achieved, the usage amount of the curing agent is greatly reduced, the remediation cost is reduced, the heavy metals are thoroughly separated from soil, the problem of heavy metal pollution rebound is avoided, and the treatment effect is good; therefore, the practicability of the stirring device for in-situ remediation of the heavy metal contaminated soil for solidification and stabilization is improved.

Description

technical field [0001] The invention relates to the field of soil remediation equipment, and more specifically relates to a stirring device for in-situ remediation and stabilization of heavy metal-contaminated soil. Background technique [0002] Soil pollutants can be roughly divided into two categories: inorganic pollutants and organic pollutants. Inorganic pollutants mainly include acids, alkalis, heavy metals, salts, compounds of radioactive elements cesium and strontium, compounds containing arsenic, selenium and fluorine, etc. Among the soil inorganic pollutants, heavy metals are the most prominent, which is mainly because heavy metals cannot be decomposed by soil microorganisms and are easy to accumulate. It is transformed into more toxic methyl compounds, and some even accumulate in the human body at harmful concentrations through the food chain, seriously endangering human health. Therefore, it is necessary to restore heavy metal-contaminated soil. The existing heavy...

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Problems solved by technology

[0003] At present, when people carry out in-situ restoration of heavy metal-contaminated soil, they usually spray the liquid solidifying agent on the ground or spread the solid solidifying agent on the ground, and then use crushing and mixing equipment such as rotary tillers to pulverize and dry the ground. Stir to mix the soil with the curing agent, and then the curing agent fixes the heavy metals in the soil to reduce the mobility and bioavailability of the heavy metals and achieve the purpose of repairing the soil. However, the use of the curing agent is large, and the repair cost is relatively high. High, and the heavy metals still remain in the soil, due to factors such as the long-term unstable curing effect of the curing agent, the heavy metals will be re-released, resulting in a rebound of heavy metal pollution, and the treatment effect is poor. At the same time, the particles of the soil after crushing are larger , it is easy to cause the problem that the soil and the curing agent cannot be fully contacted, so it is urgent to design a stirring device for in-situ repairing and stabilizing heavy metal contaminated soil

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