In this study, batch and column experiments were conducted to adsorb Aluminium (Al³⁺) from aqueous solution. The study examined the possibility of using proposed reactive filter bed media (packed with hematite or hematite sand mixture) for contaminated water treatment. Batch experiments were carried out at pH 7 Â± 0.5 and initial Al³⁺ concentration of 1.5 mg/L. Adsorption equilibrium was achieved in more than 2 hours for hematite and 1 hour for hematite coated sand while conducting batch experiment and the maximum adsorption q_m was found to be 3.38 mg/g for hematite mixture sand. From column experiment, the maximum Al adsorption capacity from four different columns was calculated to be approximately 2.2 mg/g and it was found in columns 1 and 3 packed with hematite sand mixture particles. The results indicated that both electrostatic attraction and chemical sorption could be the mechanism for Al³⁺ removal by hematite sand mixture particles from aqueous solution. Redox values (250 to 300 mV) inside column 3 suggested oxidizing condition during column operation. The continuous changes in redox potential (E_h) and pH indicated the occurrence of redox reactions between Al³⁺ and reactive media under the prevailing experimental conditions.

中文翻译：

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反应性滤床去除水中铝的实验研究

在这项研究中，进行了分批和柱实验以从水溶液中吸附铝（Al ³⁺）。该研究检查了使用提议的反应性滤床介质（装有赤铁矿或赤铁矿砂混合物）进行污水处理的可能性。在pH 7±0.5和初始Al ³⁺浓度为1.5 mg / L进行批处理实验。进行批处理实验时，赤铁矿的吸附时间超过2小时，赤铁矿涂覆的砂在1小时内达到吸附平衡，最大吸附量q _m发现赤铁矿混合砂的含量为3.38 mg / g。根据柱实验，计算出四个不同柱的最大Al吸附量约为2.2 mg / g，在装有赤铁矿砂混合物颗粒的第1和第3柱中发现。结果表明，静电吸引和化学吸附均可能是赤铁矿砂混合物从水溶液中去除Al ³⁺的机理。第3列内部的氧化还原值（250至300 mV）表明在该列操作期间的氧化条件。氧化还原电势（E _h）和pH值的连续变化表明在主要实验条件下Al ³⁺与反应介质之间发生了氧化还原反应。