title: The use of ozone in the remediation of polycyclic aromatic hydrocarbon contaminated soil.
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.
authors.affiliation: Department of Microbiology, Environmental Research Institute, University College Cork, National University of Ireland, Cork, Ireland.
authors.forename: Mark M
authors.initials: MM
authors.lastname: O'Mahony
authors.forename: Alan D W
authors.initials: AD
authors.lastname: Dobson
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Barnes
authors.forename: Ian
authors.initials: I
authors.lastname: Singleton
mesh_terms: D001673:Biodegradation, Environmental; D010126:Ozone / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D044202:Pseudomonas alcaligenes / Q000378:metabolism*; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism; D018505:Waste Management / Q000379:methods
chemical_list: D010616:Phenanthrenes; D012989:Soil Pollutants; C031181:phenanthrene; D010126:Ozone