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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Biogeochemical Behavior of Metals Along Two Permeable Reactive Barriers in a Mining-Affected Wetland
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Biogeochemical Behavior of Metals Along Two Permeable Reactive Barriers in a Mining-Affected Wetland

机译：采矿湿地两种可渗透反应屏障的金属生物地球化学行为

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The biogeochemistry of two alkaline permeable reactive barriers (PRBs) installed for remediation in a mining-affected wetland was investigated in order to assess the importance of colloidal particles on metal removal processes in such systems. At the time of investigation, both PRBs were effective in removing U, Cu, and Zn (>95%) from groundwater but were slightly less efficient for Ni and Co (<90%). Previously installed groundwater wells allowed an in-depth analysis of groundwater passing through the first PRB. Here, in an alkaline environment (pH 6.0-9.7), 11-14% of Ni, 36-37% of Co, 77-81% of Cu, 14-17% of U, and 10-19% of Fe were associated with organic matter and inorganic colloids, while upgradient in the more acidic environments (pH <6.0), ionic species and complexes (e.g., Co~(2+), Ni~(2+), Cu~(2+), and UO_2H_3SiO_4~+) dominated. Copper and U preferentially bound to larger colloidal fractions (>1 kDa), which might have promoted their sequestration. Uranium removal was likely further enhanced by U (VI) reduction in the alkaline and oxygen-depleted conditions of the PRBs. The less efficient removal of Ni and Co, being target metals for remediation, was explained by a combination of their high solubility, unfavorable redox and pH conditions created by the alkaline PRBs, and their limited association with colloidal particles. These considerations are critical in the design of future PRBs for the remediation of similar systems.
机译：安装用于在采矿受影响的湿地补救两个碱性可渗透反应屏障（PRB）的生物地球化学，以评估在这样的系统中的金属去除工艺胶体粒子的重要性进行了研究。在调查时，两者的PRB是有效地从地下水中除去U，Cu和Zn（> 95％），但略小于效率分别为Ni和Co（<90％）。先前安装的地下水井允许地下水通过的深入分析通过第一PRB。在此，在碱性环境（pH为6.0-9.7），镍11-14％，钴的36-37％以下，Cu的77-81％，U的14-17％，和Fe的10-19％的相关联与有机物和无机胶体，而upgradient在更酸性环境（pH值<6.0），离子物质和复合物（例如，钴〜（2+），镍〜（2+），铜〜（2+），和UO_2H_3SiO_4 〜+）为主。铜和U优先结合到更大的胶态级分（> 1千道尔顿），这可能会促进了它们的多价螯合。铀去除率可能进一步由U（Ⅵ）还原在碱性和PRB的贫氧条件增强。少有效除去Ni和Co的，作为目标的金属进行补救，用它们的高溶解性，用碱性的PRB创建不利的氧化还原和pH条件下，以及它们与胶体颗粒极限缔合的组合进行说明。这些考虑未来的PRB的设计相似的系统整治的关键。

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