Ectopic reaction system for remediating chromium-contaminated soil and arrangement method of system

Abstract

The invention relates to an ectopic reaction system for remediating chromium-contaminated soil and an arrangement method of the system. Chromium-contaminated soil is piled into a soil pile body in a reaction tank comprising a tank body and a soil blocking wall surrounding the tank body, wherein a geosynthetic clay liner is laid on the bottom surface and the side surface of the tank body, and an impermeable membrane and geotechnical cloth are laid on the tank body; the tail ends of the impermeable membrane and geotechnical cloth are embedded into the soil blocking wall from the outer sides; a supply pipe network for supply a remediation agent and moisture is also laid in the reaction tank; the upper surface of the soil pile body is covered by a covering membrane which completely covers the soil pile body to form an enclosed reaction system capable of preventing air from being in direct contact with the soil pile body, and the piling reaction of the contaminated soil is carried out on the system. When the environment temperature is high, moisture is evaporated gradually upward from the bottom of the pile body; when the temperature is low, water vapor is condensed, and is transferred again from the top of the pile body, so that water vapor circulation in an enclosed environment is formed, and the reaction effect is enhanced; the arrangement method is simple, and the technical requirement is low.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to an ex-situ reaction system for remediation of chromium-contaminated soil and an arrangement method of the system. Background technique [0002] Hexavalent chromium is a typical heavy metal pollutant, which has the characteristics of high toxicity and strong mobility, and poses a huge threat to the local environment and human health. In the relevant environmental protection plan, hexavalent chromium is listed as one of the key heavy metal pollutants, and large-scale hexavalent chromium pollution restoration work will be carried out in the future. Currently, ectopic remediation is mostly used for remediation of hexavalent chromium pollution. In the previous restoration process, the soil was mostly excavated from the surface and then transported to a specific structure or reactor for treatment. The structures are generally concrete structures, which need to occupy a large...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an ectopic reaction system for remediation of chromium-contaminated soil and the arrangement method of the system, so as to solve the problem that the concrete structures used in the existing soil remediation system need to occupy a large site space, the infrastructure construction period is long, and the cost is high. It is not conducive to the use of some small and medium-sized projects, and a large amount of energy consumption is generated during the operation of the equipment. After the repair is completed, it needs to be dismantled, time-consuming, labor-intensive and high-cost technical problems, and the reactor has limited processing capacity, long construction period, and inconvenient use on medium-sized and large-scale projects. It also solves the problem that the structure is not sealed, and when the soil is repaired, the dust containing pollutants harmful to the human body will directly escape into the atmosphere, resulting in a decrease in air quality and even endangering the surrounding sensitive receptors.

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