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IN SITU GAS THERMAL REMEDIATION OF A RELOCATED COKE PLANT: A PILOT STUDY
Ding, N., Y. Ren, B. Xu, N. Wang, and X. Wang.
Fresenius Environmental Bulletin Vol. 28 No. 10:7163-7169(2019)

In situ gas thermal remediation (GTR) was used in a pilot study to remediate benzo(a)anthracene (BaA)-contaminated soil at a relocated coke plant in Beijing, China. Before GTR, the concentrations of BaA at 0.5 m, 3 m, and 5 m below ground were 79.7, 65.3, and 82.7 mg/kg. The 10 m10 m pilot site was heated by 22 heating wells over 55 days. Soil temperatures were closely monitored by 5 monitoring wells, and soil vapor was continuously extracted at -10 kPa. After GTR treatment, BaA concentrations at all sampling points and depths were below the remedial target of 6.2 mg/kg. Cavities found in two locations negatively affected temperature rising until they were filled up with concrete. The soil temperature in the center of the site reached >350C, which was higher than temperatures at other monitoring points but lower than the boiling point of BaA (475C). Removal was successful due to a negative-pressure vapor extraction system which enabled BaA partitioning into the vapor phase at a much lower temperature, especially with prolonged heating time. View the October issue, pages 7163-7169, at: https://www.prt-parlar.de/download_feb_2019/



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