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Modeling of Microbial Dynamics and Geochemical Changes in a Metal Bioprecipitation Experiment

机译：金属生物沉淀实验中微生物动力学和地球化学变化的建模

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A biogeochemical transport modeling study was carried out to analyze large-scale laboratory column experiments in which ethanol was used as an electron donor to create favorable conditions for the immobilization of selected trace metals (Zn and Cu) in groundwater. Microbial activity was explicitly simulated to capture the dynamic changes of the redox zonation within the column (ⅰ) in the early phase of the experiment (microbial lag) and (ⅱ) in response to a significant decrease in the pH of the feed solution introduced after 188 days. The simulated redox dynamics agreed well with the observations after the pH-dependency of microbial growth was incorporated into the microbial model. The study showed that residual minerals may have buffered the pH for a period after the pH of the feed solution was decreased. Where the buffering capacity was exhausted, the pH decreased, leading to a successive downstream movement of the redox boundaries.The simulations reproduced the Zn immobilization within the sulfate-reducing zone as well as its partial remobilization after this zone moved further downstream. The immobilization of Cu within the denitrifying zone could also be well explained by incorporating malachite (Cu_2(OH)_2CO_3) precipitation in the simulations.
机译：进行了生物地球化学迁移模型研究，以分析大规模实验室色谱柱实验，其中乙醇用作电子供体，为固定化选定的痕量金属（锌和铜）在地下水中创造了有利条件。明确模拟微生物活性以捕获实验早期阶段（phase）（微生物滞后）和（ⅱ）柱内氧化还原区域的动态变化，以响应进水后引入的进料溶液pH值的显着降低188天将微生物生长的pH依赖性纳入微生物模型后，模拟的氧化还原动力学与观察结果非常吻合。研究表明，在进料溶液的pH值降低之后，残留的矿物质可能已经缓冲了pH值一段时间。在缓冲能力耗尽的地方，pH降低，导致氧化还原边界连续向下游移动。模拟重现了在硫酸盐还原区内锌的固定化以及在该区域向下游移动后锌的部分固定。通过将孔雀石（Cu_2（OH）_2CO_3）沉淀物纳入模拟中，也可以很好地解释Cu在反硝化区内的固定化。

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