Electrokinetic remediation of petroleum hydrocarbon contaminated soil (I)

Article

Saini, Anish, Bekele, Dawit Nega, Chadalavada, Sreenivasulu, Fang, Cheng and Naidu, Ravi. 2021. "Electrokinetic remediation of petroleum hydrocarbon contaminated soil (I)." Environmental Technology and Innovation. 23, pp. 1-9. https://doi.org/10.1016/j.eti.2021.101585
Article Title

Electrokinetic remediation of petroleum hydrocarbon contaminated soil (I)

ERA Journal ID210427
Article CategoryArticle
AuthorsSaini, Anish (Author), Bekele, Dawit Nega (Author), Chadalavada, Sreenivasulu (Author), Fang, Cheng (Author) and Naidu, Ravi (Author)
Journal TitleEnvironmental Technology and Innovation
Journal Citation23, pp. 1-9
Article Number101585
Number of Pages9
Year2021
Place of PublicationNetherlands
ISSN2352-1864
Digital Object Identifier (DOI)https://doi.org/10.1016/j.eti.2021.101585
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352186421002339
Abstract

The remediation of petroleum hydrocarbons (TPH) in a contaminated soil by electrokinetic (EK) treatment was studied in the laboratory. The effects of applying a constant electrical current on soil pH, moisture content, electrical conductivity (EC), temperature, and the concentrations of three fractions of TPH (C10–C16, C17–C34 and C35–C40) were investigated. The experiment was run for seven days and soil samples were collected at the end of the 7 day period for analysis of soil pH and TPH concentration. There were extreme pH conditions near the electrodes. At the end of the experiment there was around a 37% reduction of C10–C16 chain compounds compared to the initial concentration of 164 ± 18 mg/kg. The study investigated TPH remediation to a depth of 24 cm, which is significantly more than most studies of EK remediation of TPH-contaminated soils. We observed reductions in TPH concentrations even at a depth of 24 cm. The spatial distribution of reductions in TPH concentrations was also studied and it was observed that more remediation occurred near the cathodes than near the anodes. Further, the greatest reductions in TPH concentrations were recorded near the electrodes in the lowest and middle parts of the experimental set-up. The application of electrokinetics to remediate TPH-contaminated soils could be a viable option as an in situ remediation technology.

KeywordsElectrokinetic (EK) remediation; In-situ remediation; Petroleum hydrocarbons (TPH); Spatial distribution of TPH reduction
ANZSRC Field of Research 2020410404. Environmental management
410402. Environmental assessment and monitoring
Byline AffiliationsUniversity of Newcastle
Institution of OriginUniversity of Southern Queensland
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