Peroxymonosulfate assisted mechanochemical remediation of high concentration DDTs contaminated soil

Hengpu Xu; Xitao Liu; Zhenguo Zhang; Xiwang Zhao; Chunye Lin; Mengchang He; Wei Ouyang

doi:10.1016/j.chemosphere.2023.139651

Peroxymonosulfate assisted mechanochemical remediation of high concentration DDTs contaminated soil

Chemosphere. 2023 Oct:339:139651. doi: 10.1016/j.chemosphere.2023.139651. Epub 2023 Jul 24.

Authors

Hengpu Xu¹, Xitao Liu², Zhenguo Zhang¹, Xiwang Zhao¹, Chunye Lin¹, Mengchang He¹, Wei Ouyang³

Affiliations

¹ State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
² State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China. Electronic address: liuxt@bnu.edu.cn.
³ State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China; Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai, 519087, China.

PMID: 37495051
DOI: 10.1016/j.chemosphere.2023.139651

Abstract

DDTs (DDT and its metabolites) contaminated sites urgently need to be treated efficiently and greenly. In this study, a horizontal planetary mechanochemical method with co-milling additives was developed aiming at efficiently degrading high-concentration DDTs in historical contaminated soil (∼7500 mg/kg). Peroxymonosulfate (PMS) was firstly used to the mechanochemical degradation of DDTs in historical contaminated soil, with a degradation efficiency of over 95% after 1 h of milling under the optimal milling conditions (C_R = 30:1, r = 500 rpm, R = 1:4). Mechanism study indicated that DDTs in soil were partially dechlorinated and mineralized. The main products formed might be chlorinated aliphatic hydrocarbons, which need further treatment by ball milling or other methods. Under the action of mechanical energy, PMS could oxidize DDTs in soil through non-radical way rather than common radical way. Then, a comprehensive assessment of this remediation method was conducted by analyzing the changes in soil properties and acute biotoxicity after ball milling. Although PMS had a great performance on the degradation of DDTs, especially p, p'-DDE, it would cause the acidification and salinization of soil. Therefore, further pH adjustment and desalination treatment were suggested to reduce the negative impacts. This work successfully presents a practical approach to mechanochemical remediation of DDTs contaminated sites.

Keywords: Acute biotoxicity; DDTs; Mechanochemistry; PMS; Soil remediation.

MeSH terms

DDT / analysis
Environmental Restoration and Remediation*
Hydrocarbons, Chlorinated* / analysis
Soil / chemistry
Soil Pollutants* / analysis

Substances

Soil
DDT
peroxymonosulfate
Soil Pollutants
Hydrocarbons, Chlorinated