FerrateVI oxidation of polycyclic aromatic compounds (PAHs and polar PACs) on DNAPL-spiked sand: degradation efficiency and oxygenated by-product formation compared to conventional oxidants

Johansson, Clotilde; Bataillard, Philippe; Biache, Coralie; Lorgeoux, Catherine; Colombano, Stéfan; Joubert, Antoine; Pigot, Thierry; Faure-Catteloin, Pierre

doi:10.1007/s11356-019-06841-0

Cited by 12 publications

(12 citation statements)

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“…Matrices Origin of the dense nonaqueous phase liquid (DNAPL) and sampling site characteristics The DNAPL used in this study was sampled at 3-4-m depth in the aquifer of a former coking plant (Lorraine, France). Its molecular composition is detailed in our previous work ( Johansson et al 2020). It is dominated by naphthalene, methyl-and ethyl-naphthalenes, acenaphthene, fluorene, phenanthrene, and dibenzofuran.…”

Section: Chemicalsmentioning

confidence: 99%

“…Oxidant dose It was calculated similarly to previous experiments (Johansson et al 2020), using the stoichiometric molar ratio (SMR) based on elemental analysis of DNAPL, as proposed by Ranc et al (2016). The total mass of residual DNAPL was considered as the extractable organic matter (EOM) and was used to calculate the SOD.…”

Section: Fig1: Injection Protocol For Permanganate-treated Columns -5...mentioning

confidence: 99%

“…Numerous studies, mainly batch experiment ones, have demonstrated the efficiency of chemical oxidants to degrade PACs in contaminated soils (Forsey et al 2010;Lemaire et al 2013a;Trellu et al 2016;Usman et al 2016;Ranc et al 2017;Johansson et al 2020). A few works have addressed oxidation under flow-through conditions with column experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent study, the efficiencies of several oxidants (permanganate, heat-activated persulfate, Fenton-like reactions with magnetite as a catalyst, ferrates) to oxidize PAHs and polar PACs from a sand spiked with coal tar DNAPL were compared in batch experiments (Johansson et al 2020). Permanganate led to high degradation yields for PAHs, polar PACs, and total DNAPL mass, but also to O-PAC ketone formation.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, permanganate oxidation of DNAPL-spiked (PAH-and PAC-spiked) matrices had never been applied to column experiments yet, whereas permanganate oxidation of PAHcontaminated matrices has already shown high efficiency in batch experiments (Ranc et al 2017;Boulangé et al 2019b;Lemaire et al 2019;Johansson et al 2020). Moreover, the formation of metaloxide precipitates and oxygenated PAC intermediates as by-products is expected to have an impact on the porous medium and the water leachate quality during oxidation.…”

Section: Introductionmentioning

confidence: 99%

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

Johansson

Bataillard

Biache

et al. 2021

Environ Sci Pollut Res

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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 drainageimbibition 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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Section: Chemicalsmentioning

confidence: 99%

Section: Fig1: Injection Protocol For Permanganate-treated Columns -5...mentioning

confidence: 99%