• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Membrane technology conference exposition >Fouling of RO Membrane: Chemical and Ultrastructural Characterization
【24h】

Fouling of RO Membrane: Chemical and Ultrastructural Characterization

机译：RO膜的污垢：化学和超微结构表征

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

When performing RO filtration organic and inorganic species present in the feed water are not only responsible for direct fouling/scaling they are also promoters of bio-fouling. These phenomena, collectively called membrane fouling, lead to a critical increase in hydraulic resistance which affects the membrane system performance by increasing the operational and maintenance costs. Identification and quantification of foulants is mandatory to understand the major problematic entities so that they can be addressed and controlled specifically. Structural characterization and conformation study of cake layer reveals the contributory and synergetic role of each foulant. Direct and indirect characterization protocols were used to study the membrane fouling layer while looking at both chemical and microbial entities. Extensive imaging characterization work was performed on surface and cross sections of the intact foulant layer prepared by cryo fixation and freeze drying methods. Focused Ion Beam (FIB) was used to cross section fouled membrane. STEM (scanning transmission electron microscopy) and EDS (energy dispersive Xray spectroscopy) techniques were used to get the dark field images and to perform elemental analysis respectively. These imaging protocols provided information about thickness, composition and conformation of the foulant layer. Foulants were subjected to chemical analyses (Elemental, FT-IR and Loss on Ignition Test) and these analyses revealed the presence of all biopolymer classes including polysaccharides, proteins, aminosugars and polyhydroxyaromatics in the foulant layer. The relative proportions of these compounds were dependent upon the origin of the feed water. The accumulation of various metals was clearly observed, with variable relative abundance.
机译：当在进料中进行的RO过滤有机和无机物种时，不仅负责直接污垢/缩放，它们也是生物污垢的启动子。这些现象统称为膜污垢，导致液压阻力的临界增加，通过提高运营和维护成本来影响膜系统性能。污垢的识别和量化是强制性的，以了解主要的有问题实体，以便他们可以具体解决和控制。蛋糕层的结构表征和构象研究揭示了每种污垢的贡献和协同作用。直接和间接表征方案用于研究膜污垢层，同时看看化学和微生物实体。在由Cryo固定和冷冻干燥方法制备的完整污垢层的表面和横截面上进行广泛的成像表征工作。聚焦离子束（FIB）用于横截面污垢膜。茎（扫描透射电子显微镜）和EDS（能量分散X射线光谱）技术用于获得暗场图像并分别进行元素分析。这些成像协议提供了关于污垢层的厚度，组成和构象的信息。对污垢分析进行化学分析（元素，FT-IR和点火试验损失），这些分析显示出包括多糖，蛋白质，氨基葡萄酒和污垢层中的多羟基甲族物的所有生物聚合物课程。这些化合物的相对比例取决于进料水的起源。清楚地观察到各种金属的积累，具有可变相对丰度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号