| 徐君君,郑冠宇,徐峙晖,占新华,周立祥.土壤洗脱与光降解技术联合修复氯丹和灭蚁灵污染场地土壤的研究[J].农业环境科学学报,2015,34(9):1715-1721. |
| 土壤洗脱与光降解技术联合修复氯丹和灭蚁灵污染场地土壤的研究 |
| Remediation of Chlordane and Mirex-contaminated Soil by Combined Soil Washing and Photodegradation Technique |
| 投稿时间：2015-04-01 |
| DOI：10.11654/jaes.2015.09.013 |
| 中文关键词: 氯丹 灭蚁灵 污染场地土壤 Triton X-100 光降解 |
| 英文关键词: chlordane mirex contaminated soil Triton X-100 photodegradation |
| 基金项目:国家自然科学基金(21477055);国家高技术研究发展计划(863)项目(2009AA063103) |
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| 中文摘要: |
| 探讨土壤洗脱与光降解技术联合修复有机污染土壤的可行性,对于有效控制土壤中的有机污染物有重要意义。针对氯丹和灭蚁灵生产企业场地污染土壤,选取16种洗脱剂对其中的氯丹和灭蚁灵进行增效洗脱,优化了Triton X-100洗脱污染土壤的工艺条件,并进一步研究了采用光降解技术降解洗脱液中氯丹和灭蚁灵的可行性。结果表明,Triton X-100、Tween 80和HPCD对复合污染土壤中氯丹和灭蚁灵均有较好的洗脱效果,由于Triton X-100中的发色芳基可吸收紫外光,促进污染物的光降解,选取Triton X-100作为氯丹和灭蚁灵复合污染土壤的洗脱剂。Triton X-100洗脱氯丹和灭蚁灵复合污染土壤的最佳工艺参数为:浓度10 mmol·L-1,洗脱时间60 min,固液比1:10,洗脱3次。在此最佳工艺条件下,污染土壤中氯丹和灭蚁灵的累计洗脱率分别为98.7%和45.3%。500 W汞灯照射洗脱液,反应3 h后氯丹完全降解,灭蚁灵在反应1 h后几乎完全降解,这表明土壤增效洗脱与光催化联合处理是一种修复氯丹和灭蚁灵污染场地土壤的有效技术。 |
| 英文摘要: |
| 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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