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汞污染土壤热解吸处理过程中不同形态汞的温度效应

张倩 许端平 董泽琴 张新英 李发生 谷庆宝

张倩, 许端平, 董泽琴, 张新英, 李发生, 谷庆宝. 汞污染土壤热解吸处理过程中不同形态汞的温度效应[J]. 环境科学研究, 2012, 25(8): 870-874.
引用本文: 张倩, 许端平, 董泽琴, 张新英, 李发生, 谷庆宝. 汞污染土壤热解吸处理过程中不同形态汞的温度效应[J]. 环境科学研究, 2012, 25(8): 870-874.
ZHANG Qian, XU Duan-ping, DONG Ze-qin, ZHANG Xin-ying, LI Fa-sheng, GU Qing-bao. Effects of Temperature on Mercury Fractions in Contaminated Soil during the Thermal Desorption Process[J]. Research of Environmental Sciences, 2012, 25(8): 870-874.
Citation: ZHANG Qian, XU Duan-ping, DONG Ze-qin, ZHANG Xin-ying, LI Fa-sheng, GU Qing-bao. Effects of Temperature on Mercury Fractions in Contaminated Soil during the Thermal Desorption Process[J]. Research of Environmental Sciences, 2012, 25(8): 870-874.

汞污染土壤热解吸处理过程中不同形态汞的温度效应

基金项目: 中央级公益性科研院所基本科研业务专项(2008GGQD01);国家环境保护公益性行业科研专项(200809095)

Effects of Temperature on Mercury Fractions in Contaminated Soil during the Thermal Desorption Process

  • 摘要: 选择贵州省具有代表性的汞污染土壤样品进行热解吸修复的试验研究,同时采用连续化学浸提法对土壤样品中5种形态的汞分别进行提取,探究了不同形态汞在热解吸修复过程中的浓度变化和转化规律. 结果表明,土壤样品中各形态汞所占比例为w(王水溶汞)(占76.52%)>w(酸溶汞)(占22.40%)>w(硝酸溶汞)(占0.87%)>w(水溶性汞)(占0.14%)>w(碱溶汞)(占0.06%). w(王水溶汞)与w(Σ汞)(各形态汞总量)的相关系数可达0.978 1. 升温过程中,w(酸溶汞)和w(王水溶汞)明显降低,而其余形态汞含量则呈先升后降的趋势. 采用热解吸技术可以有效处理汞污染土壤,在370 ℃条件下能够将土壤中w(Σ汞)降至1 mg/kg以下,处理率可达95.73%,处理后土壤中的汞以残渣态汞为主,环境风险较小.

     

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出版历程
  • 收稿日期:  2012-02-02
  • 修回日期:  2012-04-04
  • 刊出日期:  2012-08-25

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