Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10372760 | Journal of Hazardous Materials | 2011 | 7 Pages |
Abstract
The application of water washing technology for recycling an organic composite solvent consisting of hexane and pentane (4:1; TU-A solvent) was investigated for extracting total petroleum hydrocarbons (TPH) from contaminated soil. The effects of water volume, water temperature, washing time and initial concentration of solvent were evaluated using orthogonal experiments followed by single factor experiments. Our results showed that the water volume was a statistically significant factor influencing greatly the water washing efficiency. Although less important, the other three factors have all increased the efficacy of water washing treatment. Based on a treatment of 20 g of contaminated soil with a TPH concentration of 140 mg gâ1, optimal conditions were found to be at 40 °C, 100 mL water, 5 min washing time and 660 mg gâ1 solvent. Semi-continuous water extraction method showed that the concentration of the composite solvent TU-A was reduced below 15 mg gâ1 d.w. soil with a recovery extraction efficiency >97%. This finding suggests that water washing is a promising technology for recycling solvent used in TPH extraction from contaminated soils.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
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Authors
Guozhong Wu, Xingang Li, Frédéric Coulon, Hong Li, Jingyan Lian, Hong Sui,