Abstract：
The reduction of chemical oxygen demand (COD) from palm oil mill effluent (POME) is very significant to ensure aquatic protection and the environment. Continuous adsorption of COD in a fixed bed column can be an effective treatment process for its reduction prior to discharge. Adsorption capacity of bone derived biocomposite synthesized from fresh cow bones, zeolite, and coconut shells for the reduction in the organic pollutant parameter was investigated in this study in a fixed bed column. The effect of influent flow rate (1.4, 2.0, and 2.6 mL/min) was determined at an influent pH 7. The optimum bed capacity on the fabricated composite of surface area of 251.9669 m2/g was obtained at 1.4 mL/min at breakthrough time of 5.15 h influent POME concentration. The experimental data were fitted to Thomas, Adams-Bohart, and Yoon-Nelson models fixed bed adsorption models. It was revealed that the results fitted well to the Adams Bohart model with a correlation coefficient of R2 > 0.96 at different influent concentration. Adsorption rate constant was observed to increase at lower flow rate influent concentration, resulting in longer empty bed contact time (EBCT) for the mass transfer zone of the column to reach the outlet of the effluent concentration. In general, the overall kinetics of adsorption indicated that the reduction in COD from POME using a bone-biocomposite was effective at the initial stage of adsorption. The pore diffusion model better described the breakthrough characteristics for COD reduction with high correlation coefficient. Shorter breakthrough time compared to EBCT before regeneration indicated that the bone composite was suitable and effective for the reduction in COD from POME using fixed bed column adsorption.
摘要：
减少棕榈油厂废水（POME）中的化学需氧量（COD）对于确保水生保护和环境非常重要。在固定床塔中连续吸附COD可以是一种有效的在排放前减少COD的处理过程。从新鲜牛骨合成的骨衍生生物复合材料的吸附能力，沸石，在这项研究中，在固定床柱中研究了椰子壳对有机污染物参数降低的影响。在进水pH7下测定进水流速(1.4、2.0和2.6mL/min)的影响。在5.15h进水POME浓度的穿透时间下以1.4mL/min获得表面积为251.9669m2/g的复合材料的最佳床容量。实验数据被拟合到托马斯，亚当斯-博哈特,和Yoon-Nelson模型固定床吸附模型。结果表明，在不同进水浓度下，结果与AdamsBohart模型拟合良好，相关系数R2>0.96。观察到吸附速率常数在较低流速流入浓度下增加，导致色谱柱的传质区达到流出物浓度出口的空床接触时间（EBCT）更长。总的来说,吸附的总体动力学表明，使用骨-生物复合材料降低POME的COD在吸附的初始阶段是有效的。孔隙扩散模型较好地描述了COD降低的突破特性，相关系数高。与再生前的EBCT相比，穿透时间更短，表明骨复合材料适用于使用固定床柱吸附降低POME的COD。
