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Application of analytical solution of advection-dispersion-reaction model to predict the breakthrough curve and mass transfer zone for the biosorption of heavy metal ion in a fixed bed column
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.psep.2020.02.018
Ronbanchob Apiratikul

Abstract This work aims to apply an analytical solution of the contaminant transport model to predict the sorption's breakthrough curve and mass transfer zone of single component heavy metal ions using green macroalga, Caulerpa lentillifera, in a small scale cylindrical fixed-bed columns. The model was represented in a form of differential equation with two model constants which were diffusion coefficient (Deff) and linear sorption coefficient (kp). The linear isotherm could be well described for the sorption at a lower range of sorbate concentration while the Langmuir isotherm was suitable for a wider range of concentration. The reference set of experiments (with a bed depth of 4 cm and a flow rate of 6 mL/min) were used for calibrating the model to obtain the model constants. The model could be well applied to predict the breakthrough curve of varying bed depth from the reference set of experiments for the sorption of Pb2+ and Cd2+. However, the model predicts slower breakthrough time than that in the experimental results when the flow rate is changed from the reference set of experiments. Three-dimensional plots and contour plots were generated to analyze the sorption behavior of metal ion in the column. The relationship between bed depth and service time (BDST) obtained from the model in this work is not linear, as often seen in the general BDST model. Both advection and dispersion processes govern the sorbate transport in the column. The mass transfer zone (MTZ) is continuously expanding along with the column length in this study. The relationship between MTZs and bed depth is also not linear.

中文翻译:

对流-分散-反应模型解析解在固定床柱中重金属离子生物吸附穿透曲线和传质区预测中的应用

摘要 本工作旨在应用污染物传输模型的解析解,在小型圆柱形固定床柱中使用绿色巨藻 Caulerpa lentillifera 预测单组分重金属离子的吸附突破曲线和传质区。该模型以具有两个模型常数的微分方程形式表示,即扩散系数(Deff)和线性吸附系数(kp)。线性等温线可以很好地描述较低范围的吸附物浓度下的吸附,而朗缪尔等温线适用于更宽的浓度范围。参考实验集(床深为 4 cm,流速为 6 mL/min)用于校准模型以获得模型常数。该模型可以很好地应用于从 Pb2+ 和 Cd2+ 吸附的参考实验集预测不同床层深度的穿透曲线。然而,当流速从参考实验集改变时,该模型预测的突破时间比实验结果中的慢。生成三维图和等高线图来分析金属离子在色谱柱中的吸附行为。从本工作中的模型获得的床层深度和服务时间(BDST)之间的关系不是线性的,这在一般的 BDST 模型中很常见。平流和分散过程都控制着塔中的山梨酸盐传输。在本研究中,传质区 (MTZ) 随着柱长不断扩大。MTZ 与地层深度之间的关系也不是线性的。
更新日期:2020-05-01
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