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| Interfacial crystal fouling and regeneration of fibrous membrane based membrane distillation |
Lan-xiang DUAN( ),Jia-ming CHEN,Jing-cheng CAI,Fei GUO*() |
| School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract The non-woven fibrous membranes were used as the interfacial barriers aiming at the problem of the crystal fouling appearing on the membrane interface when the membrane distillation (MD) was used to treat high salt water. The various initial salt mass fractions of feed and working conditions were analyzed. The crystal fouling behaviors of high salt water on the membrane interface were characterized. The nucleation and growth mechanism of crystal fouling on the membrane interface were explored. The performance analysis and failure analysis of MD system were conducted. The regeneration experiments were conducted on the membranes with interfacial crystal fouling by reducing the salt mass fraction of feed. The recovery mechanisms and performance of MD after regeneration were analyzed. Results show that NaCl crystals adhere to the fibers in the form of tiny grains, and form large crystals on the membrane interfaces near the feed liquid, which reduces the transmembrane flux of MD. The regeneration of membranes can restore the transmembrane flux of MD, and the restoration ratio is negatively correlated with the crystal growth degree.
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Received: 17 September 2021
Published: 25 October 2022
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| Fund: 复杂微纳界面构建及界面热力学研究项目（DUT21JD10） |
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Corresponding Authors:
Fei GUO
E-mail: lxduan@mail.dlut.edu.cn;feiguo@dlut.edu.cn
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基于纤维膜的膜蒸馏界面结晶及清洗再生
针对膜蒸馏（MD）技术处理高盐溶液时，膜界面出现结晶结垢的问题，以无纺结构的纤维膜为膜蒸馏的分离界面，设定不同的料液初始质量分数和膜蒸馏工况条件，表征含盐溶液在膜界面上的结晶行为，探究膜界面结晶的成核和生长机理，开展膜蒸馏的性能分析和失效分析. 通过降低料液质量分数的方式对已发生界面结晶的膜进行清洗再生实验，研究膜清洗再生后的膜蒸馏性能和恢复机制. 结果表明，NaCl结晶以微小晶粒形式附着在纤维丝上，在近料液的膜界面上形成大块结晶，降低膜蒸馏的跨膜通量. 膜的清洗再生可以恢复跨膜通量，恢复比例与结晶生长程度成负相关.
关键词：
膜蒸馏,
纤维膜,
膜界面,
结晶结垢,
清洗再生
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