Department of Civil, Geological and Mining Engineering, École, Polytechnique de Montréal, Canada.
Department of Civil, Geological and Mining Engineering, École, Polytechnique de Montréal, Canada.
Chemosphere. 2019 Dec;236:124307. doi: 10.1016/j.chemosphere.2019.07.038. Epub 2019 Jul 6.
A geochemical model was established to predict the chemical and hydraulic performances of MgO columns used to treat a nickel- and cobalt-contaminated groundwater. Using the PHREEQC software, an advection-reaction simulation was carried out to re-create the outlet concentrations observed during a previous axial column laboratory test. Reaction kinetics were introduced to calculate the rates of brucite dissolution as well as iron and manganese oxidation. Pore volume diminution during the test was also predicted using the volume of goethite precipitates generated. The floating-sphere model was applied to calculate the equivalent hydraulic conductivity (K) of the column. The geometry of the model's cells was then adjusted to represent a radial centripetal filter containing the same amount of reactive MgO. The K predictions for the centripetal filter showed that the loss of permeability in the filter could be significantly delayed by changing the filter's flow configuration. While those results are promising, further testing is necessary to provide additional experimental results for radial filters.
建立了一个地球化学模型，用于预测用于处理含镍和钴污染地下水的氧化镁柱的化学和水力性能。使用 PHREEQC 软件，进行了对流-反应模拟，以再现以前轴向柱实验室测试中观察到的出口浓度。引入反应动力学来计算水镁石溶解以及铁和锰氧化的速率。还使用生成的针铁矿沉淀的体积来预测测试过程中的孔隙体积减小。应用浮球模型来计算柱的等效水力传导率 (K)。然后调整模型单元的几何形状，以表示包含相同量反应性氧化镁的径向向心过滤器。对于向心过滤器的 K 预测表明，通过改变过滤器的流动配置，可以显著延迟过滤器的渗透率损失。虽然这些结果很有希望，但需要进一步测试，以提供径向过滤器的额外实验结果。
