Pedosphere 22(4): 572--579, 2012
ISSN 1002-0160/CN 32-1315/P
©2012 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effective treatment of trichloroethylene-contaminated soil by hydrogen peroxide in soil slurries |
CAI Xin-De1 , DU Wen-Ting1,2, WU Jia-Yi1,2, LI Rong-Fei2, GUO Yang1 and YANG Zi-Jiang1,3 |
1 South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655 (China)
2 School of Chemistry and Environment, South China Normal University, Guangzhou 510630 (China)
3 College of Resources and Environment, Hunan Agricultural University, Changsha 410128 (China) |
| ABSTRACT |
| Trichloroethylene (TCE), as one of the most common chlorinated organic compounds in soils and aquifers at many industrial sites, is carcinogenic and often recalcitrant in environment. TCE degradation in artificially contaminated soil samples was conducted using Fenton-like processes, i.e., by addition of excess hydrogen peroxide (H2O2). H2O2 could directly oxidize TCE without addition of ferrous iron in contaminated soil. Under the optimal condition (H2O2 concentration of 300 mg kg-1, pH at 5.0, and reaction time of 30 min), the removal efficiency of TCE in the soil was up to 92.3%. When the initial TCE concentration increased from 30 to 480 mg kg-1 in soil, the TCE removal rates varied from 89.2% to 86.6%; while the residual TCE in soil ranged from 2.28 to 47.57 mg kg-1. Results from successive oxidations showed that the TCE removal rate with the TCE concentration of 180 mg kg-1 increased slightly from 91.6% to 96.2% as the number of successive oxidation cycle increased from one to four. Therefore, increasing the frequency of H2O2 oxidation was perhaps a feasible way to increase TCE removal rate for TCE-contaminated soil. |
| Key Words: chemical oxidation, Fonton, remediation, soil contamination, successive oxidation |
| Citation: Cai, X. D., Du, W. T., Wu, J. Y., Li, R. F., Guo, Y. and Yang, Z. J. 2012. Effective treatment of trichloroethylene-contaminated soil by hydrogen peroxide in soil slurries. Pedosphere. 22(4): 572-579. |
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