膜科学与技术

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Analyzing protein-fouling behavior in membrane distillation via optical coherence tomography

Authors： LIU Jie1,2, WANG Yewei2, LIU Xin2, LI Weiyi2

Units： 1. Harbin Institute of Technology, School of Environment, Harbin, 150090, China; 2. Southern University of Science and Technology, School of Environmental and Engineering, Shenzhen, 518000, China

KeyWords： Membrane distillation; Membrane fouling by proteins; In-situ characterization; Optical coherence tomography

ClassificationCode：TQ028；TK2

year,volume(issue):pagination： 2021,41(6):126-132

Abstract：

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.

Funds：

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）

AuthorIntro：

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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