A mechanistic study on boron rejection by sea water reverse osmosis membranes
A mechanistic study on boron rejection by sea water reverse osmosis membranes
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DOI：
10.1016/j.memsci.2006.09.043
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发表时间：
2006-12-15
影响因子：
9.5
通讯作者：
Kim, Jae-Hong
中科院分区：
文献类型：
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作者：
Hyung, Hoon;Kim, Jae-Hong
硼是生物体生长的重要元素，但过量接触会对植物、动物甚至人类造成有害影响。然而，对于许多现有的海水反渗透 (SWRO) 膜厂来说，去除硼并满足世界卫生组织现行的饮用水质量指南一直是一项挑战。本研究的目的是评估 pH 值和温度等关键操作参数对硼脱除率的影响，并开发相应的机械预测模型。进行了实验室规模的错流过滤实验，以评估六种商用 SWRO 膜对硼的截留率。硼的截留似乎遵循与其他离子溶质不同的机制，并且不能容易地与它们的截留相关。应用不可逆热力学模型与薄膜理论相结合来定量分析实验观察结果。该模型准确预测了 SWRO 膜在不同操作条件下的硼截留性能。该模型被进一步修改，以通过模型参数的 pH 和温度依赖性来解释硼酸形态。本文开发的模型将构成 SWRO 工艺性能预测和设计的基础。 (c) 2006 Elsevier B.V. 保留所有权利。
Boron is a vital element for organism growth, but excessive exposure can cause detrimental effects to plants, animals, and possibly humans. However, it has been challenging for many of the existing sea water reverse osmosis (SWRO) membrane plants to remove boron and meet the Current World Health organization Guidelines for Drinking Water Quality. The objective of this study was to evaluate the effect of key operating parameters such as pH and temperature on boron rejection and develop a corresponding mechanistic predictive model. Bench-scale cross-flow filtration experiments were performed to estimate the rejection of boron by six commercial SWRO membranes. The rejection of boron appeared to follow a mechanism which is different from those of other ionic solutes and could not be readily correlated with their rejections. An irreversible thermodynamic model coupled with film theory was applied to quantitatively analyze the experimental observations. The model accurately predicted the boron rejection performances of the SWRO membranes at different operating conditions. The model was further modified to account for the boric acid speciation by pH and temperature dependence of the model parameters. The model developed herein will constitute fundamental for performance prediction and design of SWRO processes. (c) 2006 Elsevier B.V. All rights reserved.