Desalination ( IF 9.9 ) Pub Date : 2022-08-01 , DOI: 10.1016/j.desal.2022.116001 SungJu Im , Hyeonho Lee , Hojung Rho
Perfluorinated compounds (PFCs) adversely affect the environment in very small amounts and are extremely stable substances. This study investigated the transport phenomenon of PFCs in terms of functional groups and membrane fouling types using 10 types of PFCs and evaluated the performance of osmotically driven membranes. The experimental results confirmed that the reverse salt flux (RSF) of organic fouled membranes significantly decreased (16.2 % and 22.3 %, respectively) and the relatively loosely deposited MP fouled membranes with many empty spaces in the fouling layers maintained RSF values similar to those of virgin membranes (2 % decreased). The rejection rates of the PFCs with SO3H functional groups increased (virgin: 96.8 %; fouled: 98.6 %), whereas PFCs with COOH functional groups decreased after organic matter fouling (virgin: 99.5 %; fouled 97.6 %). The micelles formation by PFCs with SO3H group was easily blocking fouling layers and intra-particle diffusion of other PFCs with SO3H molecules interrupt. PFCs having high Kow values tends to have increased removal efficiency after the formation of MP fouling layer. These results demonstrated that the membrane fouling layers play positive roles in the RSF and PFCs removal efficiencies in osmotically driven membrane processes, which will enable the securing of safe water resources.
中文翻译:
渗透驱动膜的污垢层特性影响反向盐渗透和全氟化合物的传输行为
全氟化合物 (PFC) 对环境有极少量的不利影响,并且是极其稳定的物质。本研究使用 10 种 PFC 研究了 PFC 在官能团和膜污染类型方面的传输现象,并评估了渗透驱动膜的性能。实验结果证实,有机污染膜的反向盐通量(RSF)显着降低(分别为16.2 %和22.3 %),并且相对松散沉积的MP污染膜在污染层中具有许多空隙,其RSF值与原始膜(减少 2%)。具有SO 3 H 官能团的 PFC 的排斥率增加(原始:96.8 %;污染:98.6 %),而具有 SO 3 H 官能团的 PFC有机物污染后 COOH 官能团减少(原始:99.5 %;污染 97.6 %)。具有SO 3 H 基团的PFCs 形成的胶束很容易阻塞污垢层和其他具有SO 3 H 分子的PFCs 的颗粒内扩散中断。具有高 K ow值的 PFC 在 MP 污垢层形成后往往具有提高的去除效率。这些结果表明,膜污染层在渗透驱动的膜工艺中对 RSF 和 PFCs 的去除效率具有积极作用,这将确保安全的水资源。