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The removal efficiency and long-term hydraulic behaviour of zero valent iron/lapillus mixtures for the simultaneous removal of Cu~(2+), Ni~(2+) and Zn~(2+)

机译:零价铁/伐木子混合物的去除效率和长期液压行为,用于同时除去Cu〜(2+),Ni〜(2+)和Zn〜(2+)

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Granular mixtures composed of zero valent iron (ZVI) and lapillus at two different weight ratios (i.e. 30:70 and 50:50) were tested through column experiments for the simultaneous removal of Cu2+, Ni2+ and Zn2+ present in aqueous solutions at high concentrations. The results were used to evaluate the feasibility of the above-mentioned granular mixtures as reactive media in permeable reactive barriers (PRB) for the remediation of groundwater polluted by metals. Test results showed that the two granular reactive media efficiently removed the three heavy metals under study according to the following removal sequence Cu Zn Ni. The granular mixture with the higher iron content showed a proportionally higher removal rate but also a higher reduction of hydraulic conductivity over time. Different removal mechanisms occurred for the three contaminants in question. Considering that for Ni and Zn the main removal mechanism was probably adsorption, we used different mathematical models, in order to predict the breakthrough curves for the adsorption mechanisms. The Adams-Bohart model showed the best fit with the experimental data and it was thus used to predict the zinc removal front within the barrier thickness. Finally, we showed that the mathematical approach may be used for the design of PRBs for the reactive media and contaminants used in this research. (C) 2019 Elsevier B.V. All rights reserved.
机译:通过柱实验测试由两种不同重量比(即30:70和50:50)的粒状混合物通过柱实验进行测试,以在高浓度下在水溶液中同时除去Cu 2 +,Ni2 +和Zn2 +。结果用于评估上述粒状混合物作为可渗透反应屏障(PRB)中的反应性介质的可行性,用于修复由金属污染的地下水。试验结果表明,根据以下除去序列Cu> Zn> Ni,两种颗粒反应介质有效地除去了研究的三种重金属。具有较高铁含量的粒状混合物显示出比例更高的去除率,而且随着时间的推移还增加了液压导电性的降低。有问题的三个污染物发生了不同的去除机制。考虑到Ni和Zn主移除机制可能吸附,我们使用了不同的数学模型,以预测吸附机制的突破性曲线。 ADAMS-BOHART模型显示出最适合实验数据,因此用于预测屏障厚度内的锌去除前部。最后,我们表明,数学方法可用于PRB的设计,用于本研究中使用的反应性培养基和污染物。 (c)2019 Elsevier B.v.保留所有权利。

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