Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
ARC Centre of Excellence for Advanced Molecular Imaging, Department of Chemistry and Physics, La Trobe University, Victoria 3086, Australia.
Water Res. 2018 Jun 15;137:355-361. doi: 10.1016/j.watres.2018.03.011. Epub 2018 Mar 8.
We employed synchrotron infrared (IR) mapping to resolve forward osmosis (FO) membrane fouling in osmotic membrane bioreactor (OMBR). Synchrotron IR mapping offers a unique perspective to elucidate the fouling mechanisms and associated consequences in OMBR operation. We demonstrated the spatial distribution and relative intensity of carbohydrate and protein longitudinally along of the fouled FO membrane at the conclusion of OMBR operation. Both transmission and attenuated total reflection (ATR) modes were used to map the cross-section and surface of the fouled FO membrane. Micro X-ray computed tomography revealed patchy, "sand-dune" features on the membrane surface at the conclusion of OMBR operation. Synchrotron IR-ATR mapping demonstrated that the development of membrane fouling layer in OMBR operation was initiated by polysaccharide-like carbohydrate, followed by layering with protein-like substance, resulting in a characteristic "sand-dune" three dimensional feature. Synchrotron FTIR mapping shed light on foulant occurrence and accumulation in the draw solution. Strong penetration of protein-like substance into membrane matrix was visualised, resulting the detection of protein adsorption in the region of membrane supporting layer.
我们采用同步辐射红外（IR）图谱法来解析渗透膜生物反应器（OMBR）中的正向渗透（FO）膜污染。同步辐射 IR 图谱法为揭示 OMBR 运行中的膜污染机制及相关后果提供了独特的视角。我们在 OMBR 运行结束时，沿污染 FO 膜的长度方向，对碳水化合物和蛋白质的空间分布和相对强度进行了纵向演示。我们采用透射和衰减全反射（ATR）两种模式对污染 FO 膜的横截面和表面进行了图谱绘制。微 X 射线计算机断层扫描揭示了 OMBR 运行结束时膜表面的块状“沙丘”特征。同步辐射 ATR 图谱法表明，在 OMBR 运行过程中，膜污染层的形成是由多糖状碳水化合物引发的，随后是蛋白质状物质的分层堆积，从而形成了特征性的“沙丘”三维结构。同步辐射傅里叶变换红外（FTIR）图谱法揭示了污染物在汲取液中的发生和积累情况。蛋白质状物质强烈渗透到膜基质中，因此在膜支撑层区域检测到了蛋白质吸附。
