Device and method for repairing soil with organic matter-heavy metal combined contamination

Abstract

The invention provides a device for repairing soil with organic matter-heavy metal combined contamination. The device comprises a crushing unit, a microwave unit, an oxidation unit, an activation unitand a flue gas treatment unit which are connected in sequence, and further comprises a fluidization reaction unit connected with the microwave unit. According to the invention, microwave, oxidation,activation and fluidization treatment technologies are integrated, and soil with organic matter-heavy metal combined contamination can be repaired; and a method utilizing the device is simple to operate, good in heavy metal solidification effect and high in organic matter removal rate, and particularly can be used for repairing soil with high organic matter concentration.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to the technical field of remediation of organic matter and heavy metal compound polluted soil, in particular to a device and method for remediation of organic compound-heavy metal compound polluted soil. Background technique [0002] The combined pollution when inorganic and organic pollutants coexist is the direction and focus of current research on combined pollution. The current research mainly focuses on the combined pollution of organic chelating agents, pesticides, petroleum hydrocarbons, aromatic compounds and heavy metals. Heavy metals and polycyclic aromatic hydrocarbons are two types of important pollutants in the soil environment. They often enter the soil environment at the same time or successively to form compound pollution. Toxicological effects and remedial measures have been studied more. Most of the current remediation methods are only for a single type...

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Problems solved by technology

Most of the current remediation methods are only for a single type of pollutants, and there have been a few reports of remediation methods for compound polluted soils

[0003] CN106623380A discloses a method for remediating organic pollutant-heavy metal compound polluted soil. In the method, persulfate is added to the organic matter-heavy metal compound polluted soil to make the organic pollutants oxidize and degrade effectively, and then iron-based biochar is further applied. However, this method only fixes heavy metals on the surface, and does not effectively remove and transfer pollutants, and is not suitable for soils with high organic content. repair

[0004] CN111054741A discloses a method and device for remediating heavy metal-organic compound polluted soil by electric-leaching combined technology. Heavy metals such as copper (Cu), lead (Pb), zinc (Zn) and organic pollutants such as pyrene, benzo(a)pyrene, and benzo(g,h,i)perylene have good treatment effects, but this method only It can target specific organic substances, and the scope of application is narrow, so it is difficult to promote large-scale electric technology

[0006] To sum up, the current remediation methods for organic matter-heavy metal compound polluted soil have the problems of narrow application range and poor remediation.

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