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首页> 外文期刊>Environmental research >In-situ subaqueous capping of mercury-contaminated sediments in a fresh-water aquatic system, Part Ⅱ-evaluation of sorption materials
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In-situ subaqueous capping of mercury-contaminated sediments in a fresh-water aquatic system, Part Ⅱ-evaluation of sorption materials

机译：淡水水生系统中汞污染沉积物的原位水下封盖，第二部分-吸附材料的评估

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摘要

The function and longevity of traditional, passive, isolation caps can be augmented through the use of more chemically active capping materials which have higher sorptive capacities, ideally rendering metals non-bioavailable. In the case of Hg, active caps also mitigate the rate and extent of methylation. This research examined low cost, readily available, capping materials for their ability to sequester Hg and MeHg. Furthermore, selected capping materials were evaluated to inhibit the methylation of Hg in an incubation study as well as the capacity of a selected capping material to inhibit translocation of Hg and MeHg with respect to ebullition-facilitated contaminant transport in a column study. Results indicated that bauxite had a better capacity for mercury sorption than the other test materials. However, bauxite as well as soil capping materials did not decrease methylation to a significant extent. Materials with larger surface areas, higher organic matter and acid volatile sulfide (AVS) content displayed a larger partitioning coefficient. In the incubation experiments, the presence of a carbon source (lactate), electron acceptor (sulfate) and the appropriate strains of SRB provided the necessary conditions for Hg methylation to occur. The column study showed effectiveness in sequestering Hg and MeHg and retarding transport to the overlying water column; however, disturbances to the soil capping material resulting from gas ebullition negated its effectiveness.
机译：通过使用具有更高吸附能力的化学活性更强的封盖材料，可以增强传统的被动式隔离盖的功能和使用寿命，理想情况下，使金属不可生物利用。在汞的情况下，活性上限也会减轻甲基化的速度和程度。这项研究检查了低成本，易于获得的封盖材料的螯合Hg和MeHg的能力。此外，在孵化研究中评估了选定的封端材料抑制Hg的甲基化，以及在柱研究中评估了选定的封端材料抑制Hg和MeHg转运的能力，以促进电子化。结果表明，铝土矿比其他测试材料具有更好的汞吸附能力。但是，铝土矿和土壤覆盖材料并未显着降低甲基化。具有较大表面积，较高有机物含量和酸性挥发性硫化物（AVS）含量的材料显示较大的分配系数。在温育实验中，碳源（乳酸），电子受体（硫酸盐）和适当的SRB菌株的存在为汞甲基化的发生提供了必要条件。柱子研究显示了隔离Hg和MeHg并阻止向上方水柱的传输的有效性。然而，气体沸腾对土壤覆盖材料的干扰使它的有效性无效。

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