Overview of in-situ soil remediation technology
Soil in-situ remediation technology refers to a remediation method that directly repairs contaminated sites without the need to excavate or transport contaminated soil, thereby reducing secondary pollution and remediation costs. Its core is to reduce or eliminate pollutants in soil and restore the ecological function of soil through physical, chemical, or biological means. The in-situ soil remediation device is a key equipment for implementing this technology, and its design and performance directly affect the remediation effect.
Principle of in-situ soil remediation device
The working principle of soil in-situ remediation devices varies depending on the remediation technology, mainly divided into the following categories:
Physical repair device
Physical remediation mainly separates or immobilizes pollutants from soil through physical means. For example, thermal desorption devices use high temperatures to evaporate volatile organic compounds in soil, which are then recovered through condensation; The electrodynamic remediation device utilizes an electric field to drive the migration of heavy metal ions in the soil, and removes them after enrichment near the electrode.
Chemical repair device
Chemical remediation involves adding chemical reagents to react with pollutants, converting them into low toxicity or non-toxic substances. For example, redox devices degrade organic matter or reduce heavy metals by injecting oxidants (such as hydrogen peroxide) or reducing agents (such as zero valent iron); The stabilization device fixes pollutants in the soil by adding solidifying agents (such as cement and lime), reducing their mobility and bioavailability.
Bioremediation device
Bioremediation utilizes the metabolic activity of microorganisms or plants to degrade or adsorb pollutants. For example, microbial remediation devices inject specific microbial communities into the soil to decompose organic matter or convert heavy metals; Plant remediation devices absorb and enrich heavy metals in soil by planting hyperaccumulating plants.

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