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Xu, J, F. Wang, C. Sun, X. Zhang, and Y. Zhang.
Environmental Science and Pollution Research International [Published online 6 Jan 2019 prior to print]

The performance of in situ gas thermal remediation (GTR) was tested in China for the first time for remediation of soil and groundwater affected mainly by benzene, chlorobenzene, and petroleum. To evaluate the effectiveness of GTR, heating and extraction wells were installed in a 100 m2 soil area to 18 m depth. During the 34 days of system operation, temperature ranged 100-200°C, and pressure was 0.5-2.0 kPa. Soil and groundwater sampled 7 days after system shutdown showed that the temperatures of the central remediation area and around the heating well were higher than at the edges, with surface soil having the lowest average temperature and soil at 3-6 m depth having the highest temperatures. Respectively, removal rates of benzene, chlorobenzene, and petroleum were up to 99.81, 99.72, and 98.23% in soil and up to 98.77, 97.70, and 99.99% in groundwater.

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