Format

Send to

Choose Destination
J Hazard Mater. 2009 Aug 15;167(1-3):701-6. doi: 10.1016/j.jhazmat.2009.01.046. Epub 2009 Jan 20.

Evaluation of soil pH and moisture content on in-situ ozonation of pyrene in soils.

Author information

1
North Carolina A&T State University, Department of Civil, Architectural, Agricultural and Environmental Engineering, Greensboro, NC 27411, USA. luster@ncat.edu

Abstract

In this study, pyrene spiked soil (300 ppm) was ozonated at pH levels of 2, 6, and 8 and three moisture contents. It was found that soil pH and moisture content impacted the effectiveness of PAH oxidation in unsaturated soils. In air-dried soils, as pH increased, removal increased, such that pyrene removal efficiencies at pH 6 and pH 8 reached 95-97% at a dose of 2.22 mg O(3)/mg pyrene. Ozonation at 16.2+/-0.45 mg O(3)/ppm pyrene in soil resulted in 81-98% removal of pyrene at all pH levels tested. Saturated soils were tested at dry, 5% or 10% moisture conditions. The removal of pyrene was slower in moisturized soils, with the efficiency decreasing as the moisture content increased. Increasing the pH of the soil having a moisture content of 5% resulted in improved pyrene removals. On the contrary, in the soil having a moisture content of 10%, as the pH increased, pyrene removal decreased. Contaminated PAH soils were stored for 6 months to compare the efficiency of PAH removal in freshly contaminated soil and aged soils. PAH adsorption to soil was found to increase with longer exposure times; thus requiring much higher doses of ozone to effectively oxidize pyrene.

PMID:
19223120
DOI:
10.1016/j.jhazmat.2009.01.046
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center