Electrokinetic combined peroxymonosulfate (PMS) remediation of PAH contaminated soil under different enhance methods

Mingzhu Zhou; Qiuhua Li; Xia Wang; Qiao Huang; Long Cang

doi:10.1016/j.chemosphere.2021.131595

Electrokinetic combined peroxymonosulfate (PMS) remediation of PAH contaminated soil under different enhance methods

Chemosphere. 2022 Jan;286(Pt 1):131595. doi: 10.1016/j.chemosphere.2021.131595. Epub 2021 Jul 19.

Authors

Mingzhu Zhou¹, Qiuhua Li², Xia Wang³, Qiao Huang⁴, Long Cang⁵

Affiliations

¹ Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang, 550001, China.
² Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang, 550001, China. Electronic address: qiuhua2002@126.com.
³ Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
⁴ Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
⁵ Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: canglong@issas.ac.cn.

PMID: 34293572
DOI: 10.1016/j.chemosphere.2021.131595

Abstract

Because of the high hydrophobicity, low volatility, and high sorption capacity of PAHs, their remediation in contaminated soil is challenging. Electrokinetic (EK) enhanced chemical remediation is an emerging dual technology employed in this study, using a new oxidant peroxymonosulfate (PMS) to remediate PAHs contaminated soil. Here, PMS migration under electric field and the remediation efficiency for the PAHs polluted soil were assessed. We observed that the PMS removal efficiencies (59.7%-82.8%) were higher than those with persulfate (PS) (53.9%-78.5%), indicating PMS's superior oxidation capacity for PAHs. Although oxidant PMS can decontaminate PAHs in polluted soils, its removal of PAHs was only 11.0% without the enhanced methods. The enhancements increased the removal efficiency for PAHs from 0.33 to 2.10 times. At fixed catholyte pH of 4, the highest removal efficiency (34.1%) was achieved because it enhanced PMS migration from cathode to anode. These findings suggested that PMS was a potential oxidant for EK remediation, and some enhancements must be applied in EK combined PMS remediation PAHs polluted soil.

Keywords: Electrokinetic remediation; PAHs; Peroxymonosulfate; Soil.

MeSH terms

Environmental Restoration and Remediation*
Peroxides
Soil
Soil Pollutants* / analysis

Substances

Peroxides
Soil
Soil Pollutants
peroxymonosulfate