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| Remediation of Chlordane and Mirex-contaminated Soil by Combined Soil Washing and Photodegradation Technique |
| Received:April 01, 2015 |
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| KeyWord:chlordane;mirex;contaminated soil;Triton X-100;photodegradation |
| Author Name | Affiliation | E-mail | | XU Jun-jun | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHENG Guan-yu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XU Zhi-hui | College of Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHAN Xin-hua | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHOU Li-xiang | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | lxzhou@njau.edu.cn |
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| Abstract: |
| Organochlorine pesticides(OCPs) in soil have posed severe risks to the environment and human health. In this paper, the use of soil washing coupled with photodegradation for the remediation of soil contaminated with chlordane and mirex was investigated. In the soil washing experiment, sixteen solubilizing agents were tested for their washing efficiencies. It was found that Triton X-100, Tween 80 and HPCD had good washing efficiencies for chlordane and mirex. Since the chromophoric aryl group in Triton X-100 could absorb ultraviolet light, which might promote the photodegradation of chlordane and mirex, Triton X-100 was selected for optimizing parameters for washing chlordane and mirex from soil. The optimum parameters for Triton X-100 were 10 mmol·L-1 of concentration, 60 min of washing period, 1:10 of soil to washing agent ratio, and three successive washings. Under the optimum conditions, the removal efficiencies of chlordane and mirex from contaminated soil were 98.7% and 45.3%, respectively. The eluate obtained was then subjected to photodegradation. Under the irradiation of Hg lamp, chlordane was completely degraded within only 3 h and nearly 100% of mirex was degraded in only 1 h. The present results suggest that soil washing combined with photodegradation could be a useful option for the remediation of soil contaminated with chlordane and mirex. |
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