This work evaluates the application efficiency of coal tailings beneficiation as a solid sorbent in the treatment of real wastewater contaminated with nitrate. The solid was characterized by XDR, SEM, FTIR and TGA. Adsorption experiments were performed in batch evaluating the effects of pH, solids concentration and contact time parameters. The kinetics of nitrate adsorption was evaluated using pseudo-first-order and pseudo-second-order models. Equilibrium isotherms for this system were analyzed at three different temperatures (298, 308 and 318 K) by Langmuir, Freundlich and Sips models. The best results from the adsorption experiments were pH 6, contact time of 60 min and 1 g 100 mL⁻¹ of solid. The thermodynamics model that best described the behavior of the process was Sips. By applying these conditions to real wastewater, a nitrate removal of 93% was achieved. This result shows that adsorption using coal beneficiation tailings is technically possible.

中文翻译：

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选煤尾矿作为固体吸附剂在硝酸盐污染的实际废水处理中的应用

这项工作评估了煤尾矿选矿作为固体吸附剂在处理被硝酸盐污染的实际废水中的应用效率。通过XDR，SEM，FTIR和TGA对固体进行表征。分批进行吸附实验，评估pH，固体浓度和接触时间参数的影响。使用伪一级模型和伪二级模型评估硝酸盐吸附的动力学。通过Langmuir，Freundlich和Sips模型在三种不同温度（298、308和318 K）下分析了该系统的平衡等温线。吸附实验的最佳结果是pH 6，接触时间60分钟和1 g 100 mL ^-1固体。最能描述过程行为的热力学模型是Sips。通过将这些条件应用于实际废水，硝酸盐去除率达到93％。该结果表明，使用煤选矿尾矿进行吸附在技术上是可行的。