Abstract Adsorption is a cost-efficient and a well-established method to treat a large volume of wastewater. Most of the adsorption studies have been carried out in batch and continuous (packed and fluidized bed column) reactors. In most of the continuous operations, a solid adsorbent is held in batch mode and the liquid phase is continuous. In a counter-current liquid-solid adsorber, both the liquid and solid phase will be continuous. In this study, synthetic wastewater containing phenol of 200 ppm is treated in a counter-current liquid-solid adsorber using activated carbon as the adsorbent. The adsorption kinetics and the effect of size and mass of adsorbent were studied in batch operation. Thermodynamic properties including Gibbs' free energy, standard enthalpy and entropy change were calculated and the feasibility of the process is confirmed. In the continuous counter-current liquid-solid settling column, the effects of liquid flow rate, particle size and solid flow rate on hydrodynamics and mass transfer have been studied. From the range of flow rates studied in this work, liquid flowrate of 10 lph and solids (of diameter 0.5 mm) flow rate of 24 g/s gave the maximum phenol removal. An empirical equation has been proposed to predict the mass transfer coefficient for the range of continuous process.

中文翻译：

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连续逆流液固沉降塔中的流体动力学和苯酚吸附研究

摘要 吸附是一种经济高效且行之有效的处理大量废水的方法。大多数吸附研究是在间歇和连续（填充和流化床塔）反应器中进行的。在大多数连续操作中，固体吸附剂以间歇模式保持，液相是连续的。在逆流液固吸附器中，液相和固相都是连续的。在这项研究中，含有 200 ppm 苯酚的合成废水在逆流液固吸附器中使用活性炭作为吸附剂进行处理。在分批操作中研究了吸附动力学以及吸附剂的尺寸和质量的影响。热力学性质，包括吉布斯自由能，计算标准焓和熵变，证实了该工艺的可行性。在连续逆流液固沉降塔中，研究了液体流速、粒径和固体流速对流体动力学和传质的影响。在这项工作中研究的流速范围内，10 lph 的液体流速和 24 g/s 的固体（直径 0.5 mm）流速可最大程度地去除苯酚。已经提出了一个经验方程来预测连续过程范围的传质系数。5 mm) 24 g/s 的流速可以最大程度地去除苯酚。已经提出了一个经验方程来预测连续过程范围的传质系数。5 mm) 24 g/s 的流速可以最大程度地去除苯酚。已经提出了一个经验方程来预测连续过程范围的传质系数。