Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China.
Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China.
Chemosphere. 2022 Jun;296:134056. doi: 10.1016/j.chemosphere.2022.134056. Epub 2022 Feb 19.
Membrane fouling, which limits the application of membrane bioreactors, has received considerable research attention in recent years. In this work, filtration modeling was performed in combination with surface plasmon resonance (SPR) analysis to investigate the membrane fouling mechanism. Sodium alginate (SA) and bovine serum albumin (BSA) were used to perform dead-end filtration on hydrophilic and hydrophobic poly (vinylidene fluoride) (PVDF) membranes. The initial foulant deposition and layer formation on membranes as well as the interaction between the BSA and SA were comprehensively analyzed. Results indicated that during SA filtration, initial fouling on hydrophilic membranes were primarily attributed to the particle-membrane interactions, while the fouling on the hydrophobic membrane were dominantly caused by the interactions among SA particles. The interaction between BSA and SA led to more severe membrane fouling and hydrophobic membrane was more sensitive to it, especially in the initial filtration process. The SPR results helped clarify the in-situ deposition behavior of BSA and SA particles on the PVDF surface. Compared to SA, BSA adsorbed faster on the PVDF membrane, and specific interactions played an essential role in BSA adsorption, whereas the deposition of SA on PVDF could be easily removed by shear force. Interactions between BSA and SA could alleviate the bonding between BSA and the PVDF membrane.
膜污染限制了膜生物反应器的应用，近年来受到了相当多的研究关注。在这项工作中，结合表面等离子体共振（SPR）分析进行了过滤建模，以研究膜污染机制。使用海藻酸钠（SA）和牛血清白蛋白（BSA）在亲水和疏水聚偏二氟乙烯（PVDF）膜上进行死端过滤。全面分析了初始污染物在膜上的沉积和层形成以及 BSA 和 SA 之间的相互作用。结果表明，在 SA 过滤过程中，亲水膜上的初始污染主要归因于颗粒与膜之间的相互作用，而疏水膜上的污染主要归因于 SA 颗粒之间的相互作用。BSA 和 SA 之间的相互作用导致更严重的膜污染，并且疏水膜对此更为敏感，尤其是在初始过滤过程中。SPR 结果有助于阐明 BSA 和 SA 颗粒在 PVDF 表面的原位沉积行为。与 SA 相比，BSA 在 PVDF 膜上吸附更快，并且特异性相互作用在 BSA 吸附中起重要作用，而 SA 在 PVDF 上的沉积可以很容易地通过剪切力去除。BSA 和 SA 之间的相互作用可以减轻 BSA 与 PVDF 膜之间的结合。
