Elution-method soil remediation process

Abstract

The invention relates to an elution-method soil remediation process. The process comprises the steps of feeding, performing preliminary screening separation, performing fine screening separation, performing acid mixing pool oxidization, performing solid-liquid separation, reducing metal ions, precipitating metal ions, flocculating organic insoluble substances, performing precipitation separation and performing filter pressing treatment. The process has the beneficial effects of adopting preliminary screening eluting and fine screening eluting for separating heavy metal ions and other pollutants into water from soil, combining the metal ions and anions in acid through oxidization in two-stage acid mixing pool, dissolving the mixture in water, performing centrifugal separation, reducing pollutant-containing water through an alkali pool, reacting the water and hydroxyl to separate precipitates from sewage, flocculating the precipitates and settling the precipitates in a four-stage settling pond for solid-liquid separation, wherein the separated water can be recycled to be used for preliminary screening eluting and fine screening eluting, the pollutant-containing solids are discharged and then fed into a filter press for filter pressing recovery, and water, which is generated in the filter pressing process and contains a few of pollutants, is fed back to a sewage pool for treatment and separation again.

Description

technical field [0001] The invention relates to the field of contaminated soil remediation, in particular to a soil remediation process by a leaching method. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization and industrialization, the problem of soil and groundwater pollution in my country has become increasingly prominent. In particular, some industrial enterprises have caused a large amount of pollutants to enter the surrounding environment due to improper operation or management in the production process. , causing serious pollution, and the metallurgical industry is one of the important categories. Abandoned chemically polluted sites often occupy valuable urban locations. These sites will cause great environmental and health threats when they are used for agricultural or commercial purposes. Therefore, it is necessary to remediate the contaminated soil of the original industrial abandoned sites. ...

AI Technical Summary

Problems solved by technology

Stabilization / solidification technology is only suitable for relatively lightly polluted soil. This method is to stabilize and fix pollutants to reduce risks, rather than remove them; phytoremediation technology generally only has super-accumulative ability for a specific heavy metal, and is not effective for pollutants. More soil is more difficult, and because plants absorb pollutants very slowly, resulting in a long restoration time, so this technology is suitable for projects that do not have strict restrictions on land restoration time

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