Remediation of contaminated soils by thermal desorption; effect of benzoyl peroxide addition

In situ remediation of contaminated sites by thermal desorption is a widely accepted technology that provides a permanent solution at an economically competitive cost. In this paper, thermal desorption of various model contaminants was tested at the bench scale. Polyaromatic hydrocarbons (benzene/to...

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Bibliographic Details
Published in:Journal of cleaner production Vol. 125; pp. 309 - 313
Main Authors: Kastanek, Frantisek, Topka, Pavel, Soukup, Karel, Maleterova, Ywetta, Demnerova, Katerina, Kastanek, Petr, Solcova, Olga
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.07.2016
Subjects:
air flow
benzene
Benzoyl peroxide
Biodegradation
Bioremediation
Condensates
Contaminants
Desorption
heat treatment
Hydrocarbons
oils
ovens
oxidants
oxidation
Oxidizing agents
peroxides
polluted soils
polycyclic aromatic hydrocarbons
Pseudomonas
Remediation
Soil
Soils
Thermal desorption
toluene
vapors
xylene
Soil
Hydrocarbons
Benzoyl peroxide
Thermal desorption
Bioremediation
ISSN:0959-6526, 1879-1786
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Summary:In situ remediation of contaminated sites by thermal desorption is a widely accepted technology that provides a permanent solution at an economically competitive cost. In this paper, thermal desorption of various model contaminants was tested at the bench scale. Polyaromatic hydrocarbons (benzene/toluene/xylene) and non-polar extractable compounds were selected as representatives. The electrically heated static oven worked up to 380 °C with temperature gradient 6 °C/min, under air flow (0.6 m3/h). Prior to an experiment, model contaminants (xylene, 2-methylnaphtalene or motor oil) were mixed with 18 kg of model soil in concentrations 2−10 g/kg. The desorption process was performed with and without addition of 1 wt. % of benzoyl peroxide as an oxidant. The aim of the oxidant addition was to facilitate the chemical catalytic decomposition and/or biodegradation of desorbed organics from the soil as an alternative to usually employed incineration. In the course of the desorption process, part of the organic contaminants was oxygenated and liquids obtained after condensation of the desorbed contaminant vapours were subsequently treated by biodegradation. The application of benzoyl peroxide significantly accelerated biodegradation of organic compounds present in the condensates by Pseudomonas sp. Moreover, it was shown that the presence of partial oxidation products in the condensates did not increase their eco-toxicity. •Thermal desorption of contaminated soils at presence of 1wt% benzoyl peroxide.•Mineral oils, xylene and 2-methylnaphthalene were tested as contaminants.•Numerous oxygenated products were detected in vapours from thermal desorption.•Biodegradation by Pseudomonas strain was applied for decontamination of organics.•Presence of oxygenated products significantly accelerates the biodegradation process.
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ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2016.03.134