How to repair polluted soil

Remediation methods of contaminated soil include physical remediation technology, chemical remediation technology, biological remediation technology, physical and chemical remediation technology and ecological remediation technology.

1. Physical remediation technology: change the properties of soil pollutants by physical methods, transform them into harmless or low-toxic forms, or remove them from the soil. For example, in-situ thermal degradation (ISTD) technology can remove pollutants by heating and vacuumizing the soil surface.

2. Chemical remediation technology: changing the chemical properties of pollutants through chemical reactions, transforming them into harmless or low-toxic forms, or removing them from the soil. For example, pollutants are treated by chemical oxidation, reduction, adsorption and fixation.

3. Bioremediation technology: The pollutants are decomposed, transformed or adsorbed into harmless or low-toxic forms by using the metabolic activities of microorganisms. Such as phytoremediation technology (including plant extraction, plant stabilization and plant volatilization technology) and natural attenuation.

4. Physico-chemical remediation technology: combining physical, chemical and biological methods, and comprehensively applying various technical means to carry out soil remediation. For example, long-term use of microbial fertilizers can promote the virtuous cycle of carbon, nitrogen, oxygen and other elements in the soil ecosystem, thus achieving the purpose of remediation.

5. Ecological restoration technology: by building a healthy ecosystem, improve the self-repair ability of soil. For example, planting plants with purification function can increase soil organic matter, improve soil structure and improve soil fertility.