Predicting anion breakthrough in granular ferric hydroxide (GFH) adsorption filters
Predicting anion breakthrough in granular ferric hydroxide (GFH) adsorption filters
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DOI：
10.1016/j.watres.2007.12.019
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发表时间：
2008-04-01
期刊：
影响因子：
12.8
通讯作者：
Jekel, Martin
中科院分区：
文献类型：
--
作者：
Sperlich, Alexander;Schimmelpfennig, Sebastian;Jekel, Martin
研究了颗粒氢氧化铁（GFH）对砷酸根、磷酸根、水杨酸和地下水DOC的吸附。穿透曲线的实验测定和建模使用均匀表面扩散模型（HSDM）和它的两个衍生物，恒定模式均匀表面扩散模型（CPHSDM）和线性驱动力模型（LDF）。输入参数，Freundlich等温常数，和液相和固相扩散的传质系数进行了测定和分析，其对突破曲线的形状的影响。HSDM模拟结果令人满意地预测了所有研究物质的穿透，但LDF和CPHSDM不能正确描述砷酸盐的穿透。这是由于非常慢的颗粒内扩散和因此较高的毕奥数。根据这一观察结果，定义了LDF和CPHSDM的适用性限度。在设计固定床吸附器时，可以根据已知或估计的毕奥和斯坦顿数进行模型选择。(C)2008爱思唯尔有限公司保留所有权利。
Adsorption of arsenate, phosphate, salicylic acid, and groundwater DOC onto granular ferric hydroxide (GFH) was studied in batch and column experiments. Breakthrough curves were experimentally determined and modelled using the homogeneous surface diffusion model (HSDM) and two of its derivatives, the constant pattern homogeneous surface diffusion model (CPHSDM) and the linear driving force model (LDF). Input parameters, the Freundlich isotherm constants, and mass transfer coefficients for liquid- and solid-phase diffusion were determined and analysed for their influence on the shape of the breakthrough curve. HSDM simulation results predict the breakthrough of all investigated substances satisfactorily, but LDF and CPHSDM could not describe arsenate breakthrough correctly. This is due to a very slow intraparticle diffusion and hence higher Biot numbers. Based on this observation, limits of applicability were defined for LDF and CPHSDM. When designing fixed-bed adsorbers, model selection based on known or estimated Biot and Stanton numbers is possible. (C) 2008 Elsevier Ltd. All rights reserved.