Field column study using zerovalent iron for mercury removal from contaminated groundwater.
Field column study using zerovalent iron for mercury removal from contaminated groundwater.
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DOI：
10.1021/es050092y
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发表时间：
2005-07
影响因子：
11.4
通讯作者：
Christopher G. Weisener;K. Scott Sale;David J. A. Smyth;D. Blowes
中科院分区：
文献类型：
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作者：
Christopher G. Weisener;K. Scott Sale;David J. A. Smyth;D. Blowes
被动原位修复技术，例如，渗透性反应屏障，PRBs，与传统的地下水修复泵和处理系统相比，是一种有吸引力且更便宜的替代方案。以零价铁为反应介质，对地下水中溶解汞的去除效果进行了评价。在6周的时间内进行了两次柱测试，模拟了2年和10年地下水通过潜在的全面处理系统的流量。进水地下水pH值为7.8 ~ 9.5。在试验期间，地下水用Eh还原，校正为标准氢电极，范围从0到120 mV。在处理之前，地下水的总汞浓度约为40微克升（-1）。在为期10年的模拟中，前3周流出的汞含量约为0.5微克/升，到测试期结束时，汞含量增加到4微克/升（-1）。2年模拟的流出物一般< 0.1 μ g L（-1）。2年模拟的剖面采样表明，大部分汞去除发生在20厘米柱的最初50%。使用SEM/EDS和x射线吸收光谱（XAS）进行的矿物学研究证实，汞在20厘米区域的零价铁表面上积累。这些分析表明，汞以硫化汞的形式积累，其化学计量与朱砂和绿金属砂（HgS）相似。
Passive in situ remediation technologies, for example, permeable reactive barriers, PRBs, are an attractive and less expensive alternative compared to conventional pump and treat systems for groundwater remediation. Field column experiments were conducted to evaluate the removal of dissolved mercury from groundwater using zerovalent iron as the reactive media. Two column tests were conducted over a 6-week period, which simulated 2 and 10 years of groundwater flow through a potential full-scale treatment system. The influent groundwater pH was 7.8-9.5. The groundwater was reduced with an Eh, corrected to the standard hydrogen electrode, ranging from 0 to 120 mV over the trial period. Prior to treatment the total mercury concentration of the groundwater was approximately 40 microg L(-1). Effluent from the 10-year simulation contained approximately 0.5 microg/L of mercury during the first 3 weeks and increased to as much as 4 microg L(-1) by the end of the testing period. Effluent from the 2-year simulation was generally < 0.1 microg L(-1). Profile sampling of the 2-year simulation suggests that most of the mercury removal occurred in the initial 50% of the 20 cm column. Mineralogical studies, conducted using SEM/EDS and X-ray absorption spectroscopy (XAS), confirm the accumulation of mercury onto a zerovalent iron surface in this 20-cm zone. These analyses indicate that mercury accumulated as a mercury sulfide with a stoichiometery similar to those of cinnabar and metacinnabar (HgS).