4.7 Article

Permanganate oxidation of polycyclic aromatic compounds (PAHs and polar PACs): column experiments with DNAPL at residual saturation

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 11, 页码 15966-15982

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-16717-x

关键词

Soil and groundwater remediation; O-PAC ketones; Potassium permanganate; Dense nonaqueous phase liquid; Column flow-through experiments

资金

  1. French Environmental Agency (ADEME)
  2. French National Association for Research and Technology (ANRT)

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Permanganate oxidation of DNAPL coal tar in groundwater was limited by interfacial aging of the DNAPL drops. The reaction time at the applied flow rate was insufficient to achieve high degradation yields, but induced the formation and leaching of oxygenated PACs.
Permanganate is an oxidant usually applied for in situ soil remediation due to its persistence underground. It has already shown great efficiency for dense nonaqueous phase liquid (DNAPL) degradation under batch experiment conditions. In the present study, experimental permanganate oxidation of a DNAPL - coal tar - sampled in the groundwater of a former coking plant was carried out in a glass bead column. Several glass bead columns were spiked with coal tar using the drainage-imbibition method to mimic on-site pollution spread at residual saturation as best as possible. The leaching of organic pollutants was monitored as the columns were flushed by successive sequences: successive injections of hot water, permanganate solution for oxidation, and ambient temperature water, completed by two injections of a tracer before and after oxidation. Sixteen conventional US-EPA PAHs and selected polar PACs were analyzed in the DNAPL remaining in the columns at the end of the experiment and in the particles collected at several steps of the flushing sequences. Permanganate oxidation of the pollutants was rapidly limited by interfacial aging of the DNAPL drops. Moreover, at the applied flow rate chosen to be representative of in situ injections and groundwater velocities, the reaction time was not sufficient to reach high degradation yields but induced the formation and the leaching of oxygenated PACs.

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