In situ Adsorption Technology for Remediation of Cr(Ⅵ) Contaminated Soil

The commonly used remediation technologies for Cr(Ⅵ) contaminated soil, such as guest soil, reduction, solidification, microbiology, etc., have drawbacks such as high cost, slow efficiency, and secondary oxidation of Cr(Ⅵ). To solve these problems, a Cr(Ⅵ) contaminated soil remediation technology was developed. Firstly, polypyrrole was loaded onto the surface of attapulgite through in situ polymerization to prepare ATP/PPy adsorption material with PPy as the “shell” and ATP as the “core”. Then, ATP/PPy was embedded into the soil and remediate Cr(Ⅵ) contaminated soil through in situ adsorption technology. The experimental results show that under optimal conditions, the removal rate of Cr(Ⅵ) in soil filtrate was 58.51%, and the Cr(Ⅵ) content in the soil was reduced to 2.97mg/kg, which was lowered to below the screening value of 5.7mg/kg for the second category of development land in the Soil Environmental Quality: Risk Control Standard for Soil Contamination of Development Land (GB 36600—2018). Meanwhile, this technology has the advantages of simple operation, economic and environmental protection, high remediation efficiency, and thorough removal, and can be used for the remediation and treatment of actual Cr(Ⅵ) contaminated soil. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202307090090.