Ex-situ washing remediation method for nitrochlorobenzene-contaminated soil

Abstract

The invention discloses an ex-situ washing remediation method for nitrochlorobenzene-contaminated soil, which comprises the following steps: crushing soil and sieving to remove stones and gravels; filling the soil into a washing reactor to fully mix the soil with a proper amount of washing solution, wherein the washing agent is ethanol; subjecting the washed mixture of slurry to two stages of sieving and filtering, wherein soil particles with large particle sizes are stopped by a screen; pumping the slurry mixture to soil-liquid separation equipment, recovering, filtering and purifying separated washing solution to regenerate the washing solution, regulating the concentration of the washing solution, and leaving the washing solution for washing at next time of washing. A sand filter column is used for filtering, active carbon is used for absorbing molecules of organic contaminants such as nitrochlorobenzene in the washing solution instead of molecules of ethanol serving as the washing agent, and thus, the washing solution is purified and can be recovered and recycling of resources is realized. The organic contaminant content of the washed soil reaches related standards. The soil particles which are sieved and filtered out can be used as building and road construction materials; and the soil particles obtained by solid-liquid separation can be used as raw materials for making concrete and fire bricks and also can be reclaimed. Thus, the whole soil remediation process is accomplished. In the invention, the process is easy to implement, small-scale industrial application can be realized, and an effective means is provided for scientific researchers for researching soil remediation.

Description

technical field [0001] The invention relates to an ex-situ leaching restoration method for nitrochlorobenzene polluted soil, and belongs to the technical field of soil restoration. Background technique [0002] Soil is an important part of the ecosystem and one of the environmental resources on which human beings depend. With the development of modern industrial and agricultural production, large-scale application of chemical fertilizers and pesticides, industrial waste water continuously invades farmland, urban industrial waste and other artificial synthetic substances continuously enter the soil, landfill leakage, oil well mining and atmospheric subsidence cause soil environmental pollution accidents Keep happening. After pollutants enter the soil, they will not only affect the growth and development of plants, but also the change of biota in the soil and the transformation of substances, leading to a decline in grain production and quality, and causing secondary pollutio...

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Problems solved by technology

[0011] However, at present, there is no relatively mature method for ex-situ leaching remediation of nitrochlorobenzene-contaminated soil that can be applied to small-scale industrial applications.

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