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The use of ozone in the remediation of polycyclic aromatic hydrocarbon contaminated soil

Lookup NU author(s): Emeritus Professor Jerry Barnes, Dr Ian Singleton

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Abstract

The potential of using ozone for the removal of phenanthrene from several different soils, both alone and in combination with biodegradation using a microbial inoculant (Pseudomonas alcaligenes PA-10), was examined. The greater the water content of the soil the less effective the ozone treatment, with air-dried soils showing the greatest removal of phenanthrene; while soils with higher levels of clay also reduced the effectiveness of the ozone treatments. However, at least a 50% reduction in phenanthrene levels was achieved in air-dried soil after an ozone treatment of 6 h at 20 ppm, with up to 85% removal of phenanthrene achieved in sandy soils. The biodegradation results indicate that P. alcaligenes PA-10 may be useful as an inoculant for the removal of PAHs from contaminated soils. Under the conditions used in our experiments, however, pre-ozonation did not enhance subsequent biodegradation of phenanthrene in the soils. Similar levels of phenanthrene removal occurred in both non-ozonated and ozonated Cruden Bay soil inoculated with P. alcaligenes PA-10. However, the biodegradation of phenanthrene in ozonated Boyndie soil was much slower. This may be due to the release of toxic products in this soil during ozonation. © 2005 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): O'Mahony MM, Dobson ADW, Barnes JD, Singleton I

Publication type: Article

Publication status: Published

Journal: Chemosphere

Year: 2006

Volume: 63

Issue: 2

Pages: 307-314

ISSN (print): 0045-6535

ISSN (electronic): 1879-1298

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.chemosphere.2005.07.018

DOI: 10.1016/j.chemosphere.2005.07.018

PubMed id: 16153687

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