Institute of Environmental Engineering and Management, National Taipei University of Technology, No.1, Sec. 3, Zhongxiao E. Rd. Taipei 10608, Taiwan.
Faculty of Environment and Natural Resources, Dalat University, 01 Phu Dong Thien Vuong Street, Da Lat City 66000, Vietnam.
Molecules. 2019 Jun 25;24(12):2345. doi: 10.3390/molecules24122345.
For the first time, a nanosilver-coated hollow fiber microfiltration (MF) was fabricated by a simple chemical reduction method, then tested for membrane biofouling mitigation study under extreme high mixed liquor suspended solid (MLSS) concentration for long term. This study presents a simple and novel technique to modify a commercially available MF membrane using silver nanoparticles (AgNPs) followed by an investigation of mitigating membrane biofouling potentials using this modified membrane to compare with an unmodified membrane for 60-day operation period. The modified membranes showed that AgNPs was attached to the MF-membrane successfully with a high density of 119.85 ± 5.42 mg/m. After long-term testing of 60 days in membrane bioreactor with a MLSS concentration of 11,000 mg/L, specific flux of the AgNPs coated MF (AgNPs-MF) decreased 59.7%, while the specific flux of the unmodified membrane dropped 81.8%, resulted from the increase of transmembrane vacuum pressure for the AgNPs-MF was lower than that of the unmodified one. The resistance-in-series model was used to calculate the resistance coefficients of membrane modules, and the result showed that the cake layer resistance coefficient of the unmodified membrane was 2.7 times higher than that of the AgNPs-MF after the 60-day operation, confirming that AgNPs displayed great antimicrobial properties to mitigate membrane biofouling under such high MLSS.
首次采用简单的化学还原法制备了纳米银涂层中空纤维微滤（MF）膜，并在长期极端高混合液悬浮固体（MLSS）浓度下进行了膜生物污染缓解研究。本研究提出了一种简单而新颖的技术，使用银纳米粒子（AgNPs）修饰市售 MF 膜，并通过使用该改性膜与未改性膜进行比较，研究了减轻膜生物污染的潜力，该改性膜的操作周期为 60 天。改性膜表明 AgNPs 成功地附着在 MF 膜上，密度高达 119.85 ± 5.42 mg/m。在 MLSS 浓度为 11,000 mg/L 的膜生物反应器中进行 60 天的长期测试后，AgNPs 涂层 MF（AgNPs-MF）的比通量下降了 59.7%，而未改性膜的比通量下降了 81.8%，这是因为 AgNPs-MF 的跨膜真空压力增加低于未改性膜。采用串联阻力模型计算膜组件的阻力系数，结果表明，经过 60 天运行后，未改性膜的滤饼层阻力系数比 AgNPs-MF 高 2.7 倍，证实 AgNPs 在如此高的 MLSS 下具有良好的抗菌性能，可减轻膜生物污染。
