ABSTRACT

The purification of wastewater is preferred using the adsorption by column due to the process’s high efficiency. Column investigations are performed to remove hazardous pollutants and demonstrate the adsorption efficiency of the pollutants in the wastewater treatment process. Cadmium and zinc exist in radioactive and industrial wastes. Therefore, this work is interested in zinc and cadmium removal from wastewater utilising a fixed-bed column. Zirconia–silicate composite (ZrO₂–SiO₂) was synthesised utilising the sol–gel technique and analyzed for this purpose. The influence of some parameters as bed depth (2.0, 3.0 and 5.0 cm), flow rate (2.0 and 3.0 mL/min) and initial ions concentrations (50–200 mg/L) was investigated. The column performance was computed to be 80.3 and 79.3% for Zn2 + and Cd2+, respectively, at the optimum conditions (3.0 cm bed depth, 2.0 mL/min flow rate and 100 mg/L ions concentration). Thomas, Adams–Bohart and Yoon–Nelson theories were performed to assess breakthrough curves and determine the parameters of column models which are essential for scale-up design. Thomas theory exhibited the highest R² values (0.84–0.97) and gave the most accurate computation of the adsorption process.

摘要

由于该过程的高效率，优选使用柱吸附来净化废水。进行柱调查以去除有害污染物并证明污染物在废水处理过程中的吸附效率。镉和锌存在于放射性和工业废物中。因此，这项工作对利用固定床柱从废水中去除锌和镉感兴趣。氧化锆-硅酸盐复合材料（ZrO ₂ -SiO ₂) 是利用溶胶-凝胶技术合成的，并为此目的进行了分析。研究了床深（2.0、3.0 和 5.0 cm）、流速（2.0 和 3.0 mL/min）和初始离子浓度（50-200 mg/L）等参数的影响。在最佳条件（3.0 cm 床深、2.0 mL/min 流速和 100 mg/L 离子浓度）下，计算得到的 Zn2 + 和 Cd2+ 色谱柱性能分别为 80.3% 和 79.3%。Thomas、Adams-Bohart 和 Yoon-Nelson 理论用于评估突破曲线并确定对于放大设计至关重要的柱模型参数。Thomas 理论表现出最高的R ²值（0.84-0.97），并给出了最准确的吸附过程计算。