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Laboratory-scale column study for remediation of TCE-contaminated aquifers using three-section controlled-release potassium permanganate barriers |
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| Authors: | Baoling Yuan Fei Li Yanmei Chen and Ming-Lai Fu |
| Institution: | 1. Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen 361021, China 2. College of Civil Engineering, Fuzhou University, Fuzhou 351008, China 3. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China |
| Abstract: | A laboratory-scale study with a sand column was designed to simulate trichloroethylene (TCE) pollution in the aquifer environment with three-section controlled-release potassium permanganate (CRP) barriers. The main objective of this study was to evaluate the feasibility of CRP barriers in remediation of TCE in aquifers in a long-term and controlled manner. CRP particles with a 1:3 molar ratio of KMnO4 to stearic acid showed the best controlled-release properties in pure water, and the theoretical release time was 138.5 days. The results of TCE removal in the test column indicated that complete removal efficiency of TCE in a sand column by three-section CRP barriers could be reached within 15 days. The molar ratio of KMnO4 to TCE in the three-section CRP barriers was 16:1, which was much lower than 82:1 as required when KMnO4 solution is used directly to achieve complete destruction of TCE. This result revealed that the efficiency of CRP for remediation of TCE was highly improved after encapsulation. |
| Keywords: | chlorinated solvent encapsulation groundwater KMnO4 permeable reactive barrier sand column |
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