The increased use of fertilizers from phosphates in agriculture generates water pollution by heavy metals contained in these phosphates at levels higher than the standards. In our study, we used a cadmium nitrate Cd(NO3)2 solution to simulate artificially polluted water, whose decontamination efficiency will be evaluated by an electrocoagulation/flotation process. During this work, we aimed to optimize the electrocoagulation process according to the following factors: initial pH of the solution, density of the electrolysis current, cell time, and nature of the supporting electrolyte and its concentration. The criteria adopted during the optimization of the process are relatively different from those used in similar studies. Indeed, we have tried to achieve maximum efficiency and also seeking to minimize costs and facilitate implementation. We achieved a 98% Cd removal efficiency from the solution at pH = 7, J = 6.25 A/m2, t = 10 min, and [K2SO4] = 0.01 M. In addition, during the characterization of the flocs obtained as a supernatant, we first highlighted the presence of Cd in this gelatinous body and then the relatively easy volatility of Cd as well as that of aluminum oxide (Al2O3).

中文翻译：

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电凝除镉过程中理化参数的优化

农业中磷酸盐化肥的使用增加，导致这些磷酸盐中含有的重金属含量高于标准，造成水污染。在我们的研究中，我们使用硝酸镉 Cd(NO3)2 溶液来模拟人工污染的水，其净化效率将通过电凝/浮选工艺进行评估。在这项工作中，我们旨在根据以下因素优化电凝过程：溶液的初始 pH 值、电解电流密度、电池时间以及支持电解质的性质及其浓度。过程优化过程中采用的标准与类似研究中使用的标准相对不同。事实上，我们一直在努力实现最高效率，同时也在努力降低成本并促进实施。