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热解吸修复污染土壤过程中DDTs的去除动力学

许端平 何依琳 庄相宁 谷庆宝

许端平, 何依琳, 庄相宁, 谷庆宝. 热解吸修复污染土壤过程中DDTs的去除动力学[J]. 环境科学研究, 2013, 26(2): 202-207.
引用本文: 许端平, 何依琳, 庄相宁, 谷庆宝. 热解吸修复污染土壤过程中DDTs的去除动力学[J]. 环境科学研究, 2013, 26(2): 202-207.
XU Duan-ping, HE Yi-lin, ZHUNAG Xiang-nin, GU Qing-bao. Desorption Kinetics of DDTs from Contaminated Soil during Processes of Thermal Desorption[J]. Research of Environmental Sciences, 2013, 26(2): 202-207.
Citation: XU Duan-ping, HE Yi-lin, ZHUNAG Xiang-nin, GU Qing-bao. Desorption Kinetics of DDTs from Contaminated Soil during Processes of Thermal Desorption[J]. Research of Environmental Sciences, 2013, 26(2): 202-207.

热解吸修复污染土壤过程中DDTs的去除动力学

基金项目: 中央级公益性科研院所基本科研业务专项(2008GGQD01)

Desorption Kinetics of DDTs from Contaminated Soil during Processes of Thermal Desorption

  • 摘要: 采用热解吸修复技术对北京某农药厂旧址的DDTs(滴滴涕)污染土壤进行修复试验,优化了土壤中DDTs的热解吸温度,对DDTs热解吸动力学过程以及土壤水分对热解吸修复效果的影响进行了研究. 结果表明,热解吸修复技术可有效去除土壤中DDTs,在340℃时土壤中∑DDTs的去除率达到99%,此时土壤中的w(∑DDTs)为0.598mg/kg,低于HJ 350—2007《展览会用地土壤环境质量评价标准(暂行)》(1.0mg/kg),但继续升温∑DDTs去除率的变化不明显. 土壤中∑DDTs的热解吸动力学符合二级动力学方程(R2为0.9914),热解吸过程受土壤中w(∑DDTs)的影响较大,即随时间的增加,w(∑DDTs)下降,热解吸速率会迅速降低. 土壤含水率对热解吸效果有一定的影响,特别是当土壤含水率超过16%时p,p-DDE的去除率明显降低,而土壤含水率对其他组分的影响较小.

     

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出版历程
  • 收稿日期:  2012-09-28
  • 修回日期:  2012-12-25
  • 刊出日期:  2013-02-25

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