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应用光学相干断层成像技术分析膜蒸馏过程中的蛋白质膜污染行为

作者：刘杰¹，²，王业威²，刘鑫²，李炜怡²

单位： 1. 哈尔滨工业大学环境学院，哈尔滨150090；2. 南方科技大学环境科学与工程学院，深圳 518000

关键词：膜蒸馏；蛋白质膜污染；原位表征；光学相干断层成像

DOI号：

分类号： TQ028；TK2

出版年,卷(期):页码： 2021,41(6):126-132

摘要：

膜蒸馏是一种新兴的水/废水处理技术。蛋白质膜污染是膜蒸馏（MD）过程中普遍存在的现象，其机理的解析有助于提高膜蒸馏的处理效率。本研究旨在应用光学相干断层成像技术（OCT）分析MD过程中的蛋白质膜污染行为。在原位表征的基础上，通过数值算法，以不同方式解读OCT数据集。不但成功追踪到渗透通量下降诱发的分离膜位移，还通过对比面平均强度（SAI）剖面曲线，证实了蛋白质污染物在进料液-膜界面区域的沉积。此外，通过评估每个坐标面上的正异常点份率（FPAs），定量揭示了污染层的时空演化。本研究将有助于开发缓解蛋白质膜污染的膜蒸馏工艺。

Protein fouling is a pervasive phenomenon in membrane distillation (MD), which is an emerging technique for water/wastewater treatment. Improving the efficiency of MD demands detailed insights into the mechanisms of fouling by proteins. This study was aimed at analyzing the protein fouling in MD via an approach based on optical coherence tomography (OCT), which is an advanced technique offering the ability of optical sectioning. The MD system was integrated with OCT in an effort to in-situ characterize the fouling behavior of lysozyme (LYS) at a micron scale. Numerical algorithms were employed to interpret the OCT datasets in various ways. Although the 2D tomographic images were unable to visualize the fouling layer of protein, it was successful to capture the membrane shift induced by the flux decline, providing indirect evidence for the protein fouling. On the other hand, the deposition of protein was confirmed by comparing the profiles of surface-averaged intensity (SAI). More details about the spatiotemporal evolution of the fouling layer were quantitatively revealed by evaluating the fraction of positive anomalies (FPAs) that approximated the coverage of protein foulants at each coordinate surface. While confirming the strength of OCT for characterizing membrane fouling by proteins, this study lends itself to the development of MD processes with mitigated fouling by proteins.

基金项目：

国家自然科学基金项目（21878140）；广东省科技项目（2017ZT07Z479和2019KTSCX158）；深圳市科技项目（JCYJ20190809172011680）

作者简介：

刘杰（1989-），男，湖南邵东人，哈尔滨工业大学和南方科技大学联合培养博士生，研究方向为膜分离技术，E-mail：11849580@mail.sustech.edu.cn.。

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