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Mineral Scaling on Reverse Osmosis Membranes: Role of Mass, Orientation, and Crystallinity on Permeability
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-11-17 , DOI: 10.1021/acs.est.1c04143 Meng Wang 1 , Bo Cao 1 , Yandi Hu 1, 2 , Debora F Rodrigues 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-11-17 , DOI: 10.1021/acs.est.1c04143 Meng Wang 1 , Bo Cao 1 , Yandi Hu 1, 2 , Debora F Rodrigues 1
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Prior mineral scaling investigations mainly studied the effects of membrane surface properties rather than on the mineral properties and their impact on membrane permeability. In our study, mass, crystal growth orientation, and crystallinity of mineral precipitates on membranes, as well as their effects on membrane permeability have been investigated. Gypsum scaling tests on bare and bovine serum albumin (BSA)-conditioned membranes were conducted under different saturation indices. Results show that a longer scaling period was required for BSA-conditioned membranes to reach the same membrane permeate flux decline as bare membranes. Though the final reduced permeability was the same for both two membranes, the masses of the mineral precipitates on BSA-conditioned membranes were around two times more than those on bare membranes. Further mineral characterizations confirmed that different permeability decay rates of both types of the membrane were attributed to the differences in growth orientations rather than amounts of gypsum precipitates. Moreover, BSA-conditioned layers with high carboxylic density and specific molecular structure could stabilize bassanite and disrupt the oriented growth to inhibit the formation of needle-like gypsum crystals as observed on bare membranes, thus resulting in lower surface coverage with scales on membranes and alleviating the detrimental scaling effect on membrane permeability.
中文翻译：
反渗透膜上的矿物结垢：质量、取向和结晶度对渗透率的影响
先前的矿物结垢研究主要研究膜表面特性的影响，而不是对矿物特性及其对膜渗透性的影响。在我们的研究中，研究了膜上矿物沉淀物的质量、晶体生长方向和结晶度，以及它们对膜渗透性的影响。在不同饱和指数下对裸露和牛血清白蛋白 (BSA) 条件膜进行石膏结垢测试。结果表明，BSA 调节的膜需要更长的结垢期才能达到与裸膜相同的膜渗透通量下降。尽管两种膜最终降低的渗透性相同，但 BSA 调节膜上矿物沉淀的质量大约是裸膜上的两倍。进一步的矿物表征证实，两种类型膜的不同渗透率衰减率归因于生长方向的差异，而不是石膏沉淀物的数量。此外，具有高羧基密度和特定分子结构的 BSA 调节层可以稳定贝桑石并破坏定向生长，从而抑制在裸膜上观察到的针状石膏晶体的形成，从而导致膜上鳞屑的表面覆盖率降低，缓解对膜渗透性的有害结垢效应。
更新日期：2021-12-07
中文翻译：
反渗透膜上的矿物结垢：质量、取向和结晶度对渗透率的影响
先前的矿物结垢研究主要研究膜表面特性的影响，而不是对矿物特性及其对膜渗透性的影响。在我们的研究中，研究了膜上矿物沉淀物的质量、晶体生长方向和结晶度，以及它们对膜渗透性的影响。在不同饱和指数下对裸露和牛血清白蛋白 (BSA) 条件膜进行石膏结垢测试。结果表明，BSA 调节的膜需要更长的结垢期才能达到与裸膜相同的膜渗透通量下降。尽管两种膜最终降低的渗透性相同，但 BSA 调节膜上矿物沉淀的质量大约是裸膜上的两倍。进一步的矿物表征证实，两种类型膜的不同渗透率衰减率归因于生长方向的差异，而不是石膏沉淀物的数量。此外，具有高羧基密度和特定分子结构的 BSA 调节层可以稳定贝桑石并破坏定向生长，从而抑制在裸膜上观察到的针状石膏晶体的形成，从而导致膜上鳞屑的表面覆盖率降低，缓解对膜渗透性的有害结垢效应。
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