In this investigation, an attempt has been made to evaluate the performance of a novel Semifluidized bed adsorption column for the removal of divalent heavy metal ions from synthetic wastewater. Low cost low density adsorbent has been synthesized from Sugarcane bagasse based biochar and Na-Alginate. The biochar has specific surface area of 391.42 m²/g and it’s composite has 200.14 m²/g respectively. Major operating parameters for the system were adsorbent bed height, initial solute concentration and feed flow rate. The optimum condition of the process for maximum percentage removal of metal ions was analysed by Response Surface Methodology technique. The satisfactory values of correlation coefficients ensure the suitability of the model from process optimization. The optimum conditions for Zn²⁺, Cu²⁺ and Ni²⁺ were of same values having initial adsorbent bed height 12.97 cm, initial solute concentration 14.05 mg/L and feed flow rate of 2.81 LPM(Liter Per Minute) and maximum percentage removal were found to be 87.56 %, 88.89 % and 84.31 % respectively. A real-time dynamic mass transfer model based on solid-liquid mass balance has also been developed and validated with all the experimental data. Solid-liquid interphase mass transfer coefficient along with the axial dispersion coefficient for individually packed and a fluidized section of bed was also estimated from the developed model. The axial dispersion coefficient was calculated as 5.1 $\pm$ 0.3 × 10⁻¹¹ m²/s for packed section and 4.8 $\pm$ 0.3 × 10^-6 m²/s for fluidized section. Mass transfer coefficient for Zn²⁺, Cu²⁺ and Ni²⁺ were 1.11–1.21 × 10^-4 m/s, 1.31−1.371 × 10^-4 m/s 1.09−1.18 × 10^-4 m/s under specific bed operating conditions.

在这项研究中，已尝试评估新型半流化床吸附柱从合成废水中去除二价重金属离子的性能。低成本低密度吸附剂是由甘蔗渣基生物炭和海藻酸钠合成的。生物炭的比表面积为391.42 m ² / g，其复合材料为200.14 m ²/ g。该系统的主要操作参数是吸附剂床高度，初始溶质浓度和进料流速。通过响应表面法技术分析了最大程度地去除金属离子的最佳工艺条件。相关系数的令人满意的值可确保从过程优化中得出模型的适用性。Zn 2 ⁺，Cu ²⁺和Ni ²⁺的最佳条件它们具有相同的值，初始吸附剂床高度为12.97 cm，初始溶质浓度为14.05 mg / L，进料流速为2.81 LPM（每分钟升），最大去除百分率分别为87.56％，88.89％和84.31％。还开发了基于固液质量平衡的实时动态传质模型，并利用所有实验数据进行了验证。还从开发的模型中估算了单独填充床和流化床的固液间传质系数以及轴向弥散系数。轴向弥散系数计算为5.1$\pm$包装部分0.3×10 ^-11  m ² / s和4.8$\pm$流化段为0.3×10 ^-6  m ² / s。在特定床下，Zn 2 ⁺，Cu ²⁺和Ni ^2+的传质系数为1.11-1.21×10 ^-4 m / s，1.31-1.371×10 ^-4 m / s 1.09-1.18×10 ^-4 m / s运行条件。