Heavy metal contaminated soil remediation device and remediation method thereof

Abstract

The invention relates to the technical field of soil remediation, in particular to a heavy metal contaminated soil remediation device and a remediation method.The heavy metal contaminated soil remediation device comprises a center rotary drum, a hollow spiral rod is arranged in the center rotary drum, the center rotary drum is sleeved with a screening barrel, and first spiral blades are arranged on the inner wall of the screening barrel; the screening barrel is rotationally sleeved with an interlayer rotating barrel, a second spiral blade is arranged on the inner wall of the interlayer rotating barrel, the interlayer rotating barrel is sleeved with an outer fixing barrel, a stirring rod is arranged between the outer fixing barrel and the interlayer rotating barrel, and a cavity between the outer fixing barrel and the interlayer rotating barrel communicates with a cavity between the screening barrel and the center rotating drum. The outer fixing cylinder, the interlayer rotary cylinder, the screening cylinder and the center rotary drum are arranged in a layer-by-layer sleeving mode, the structure is compact, continuous implementation of soil slurry making, particle size grading, dissolving and washing and solid-liquid separation is achieved, compared with an existing device, the transfer time is shortened, remediation work is finer, consumption of chemical agents is reduced, and the efficiency of soil remediation work is greatly improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a remediation device for heavy metal-contaminated soil and a remediation method thereof. Background technique [0002] Soil remediation is a technical measure to restore the normal function of polluted soil. In the soil remediation industry, there are more than one hundred existing soil remediation technologies, and there are more than ten commonly used technologies, which can be roughly divided into three methods: physical, chemical and biological. Specifically, it refers to the use of physical, chemical and biological methods to transfer, The main technical principle of absorbing and reducing is to understand and transform pollutants in the soil, reduce its concentration to an acceptable level, or convert toxic and harmful pollutants into harmless substances. Fundamentally speaking, the technical principles of contaminated soil remediation can include: (1) changing th...

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Problems solved by technology

[0005] (1) Due to the certain humidity and viscosity of the soil, even if the soil is crushed by the crushing drum and the flipping fins, the gradual accumulation during the screening process will still block the screen holes of the screening plate, resulting in a greatly reduced efficiency of the soil remediation process decline

[0006] (2) After the soil remediation is completed, the soil is discharged by turning the crushing drum so that the outlet is facing downward. In this state, the crushing drum can no longer rotate, that is, the screening plate and the flipping fin They are all in a static state, which will form a horizontal barrier, making it very difficult for the soil to drain

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