Mitigation of gypsum and silica scaling in membrane distillation by pulse flow operation
Mitigation of gypsum and silica scaling in membrane distillation by pulse flow operation
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DOI：
10.1016/j.memsci.2021.119107
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发表时间：
2021-04
影响因子：
9.5
通讯作者：
Li Liu;Hailong He;Yidan Wang;Tiezheng Tong;Xuemei Li;Yuebiao Zhang;T. He
中科院分区：
文献类型：
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作者：
Li Liu;Hailong He;Yidan Wang;Tiezheng Tong;Xuemei Li;Yuebiao Zhang;T. He
现有关于膜蒸馏（MD）抗结垢性的文献主要集中在膜材料上。然而，操作条件也会对结垢产生重大影响，而这一点常常被忽视。本文报道了使用商用疏水性聚偏二氟乙烯 (PVDF) 膜在 MD 中脉冲和稳定流对矿物结垢的影响。使用过饱和石膏或二氧化硅溶液，比较了脉冲和稳定流条件下 MD 浓度的结垢行为。脉冲流使膜产生规则振动的状态，从而破坏颗粒在表面上的聚集和沉积，并降低温度和浓差极化。与稳定流相比，脉冲流导致两种结垢类型的 PVDF 膜结垢倾向较低且初始通量稍高。对流动动力学的探索提供了一种减轻膜蒸馏中矿物结垢的策略，表明操作过程优化可以为稳健且持久的 MD 过程做出重大贡献。
The existing literature on scaling resistance in membrane distillation (MD) mainly focuses on membrane materials. However, the operation conditions can also have a significant effect on scaling, which is often overlooked. This paper reports the effects of pulse and steady flow on mineral scaling in MD using a commercial hydrophobic polyvinylidene fluoride (PVDF) membrane. The scaling behaviors of MD concentration were compared between pulse and steady flow conditions using supersaturated gypsum or silica solutions. The pulse flow creates a state of regular vibration of the membrane, which disrupts the aggregation and deposition of particles on the surface and reducing temperature and concentration polarization. Comparing to steady flow, the pulse flow resulted in lower scaling propensity and a slightly higher initial flux of the PVDF membrane for both scaling types. The exploration of flow dynamics has provided a strategy for mitigating mineral scaling in membrane distillation, indicating that operation process optimization can contribute significantly to a robust and durable MD process.