Complete equipment for soil remediation by leaching method

Abstract

The present invention provides complete equipment for soil remediation by a leaching method. The complete equipment includes a screw conveyor, a preliminary screening separator, a fine screening separator, an acid-added blending tank, a centrifugal separator, a cesspool, an alkali-added blending tank, a sedimentation basin and a filter press. Heavy metal ions and other pollutants are separated from soil to water by adopting preliminary screening and leaching, and fine screening and leaching. The metal ions are combined to anions of an acid solution by a two-stage acid pool oxidation, and the combined products are dissolved in water. The water containing the pollutants and mud, from which the pollutants are removed, are separated by the centrifugal separator. The water containing the pollutants is reduced in the alkali pool, then reacts with hydroxyls, and is separated from the sewage in the form of precipitates. The precipitates, after being flocculated, enter the four-stage sedimentation basin, and are subjected to solid and fluid separation. The separated water is recycled and used for the preliminary screening and leaching. The process design is reasonable. The processing effect is good, and the processing cost is low. The process is widely used.

Description

Technical field [0001] The invention relates to the field of contaminated soil restoration, in particular to a leaching method soil restoration process. 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 number of pollutants to enter the surrounding environment due to improper operation or management during the production process. , Causing serious pollution, the metallurgical industry is an important category. Abandoned chemical contaminated sites often occupy valuable urban locations. When these sites are used for agricultural or commercial purposes, they pose great environmental and health threats. Therefore, it is necessary to repair the contaminated soil of the original industrial abandoned sites. [0003] The current remediation...

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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