Early non-destructive biofouling detection in spiral wound RO membranes using a mobile earth's field NMR
Early non-destructive biofouling detection in spiral wound RO membranes using a mobile earth's field NMR
复制标题
DOI：
10.1016/j.memsci.2015.03.088
复制
发表时间：
2015-09-01
影响因子：
9.5
通讯作者：
Johns, M. L.
中科院分区：
文献类型：
--
作者：
Fridjonsson, E. O.;Vogt, S. J.;Johns, M. L.
我们演示了使用地球磁场（EF）核磁共振（NMR），以提供早期的非破坏性检测的商业螺旋缠绕反渗透（RO）膜组件的活性生物污垢。反渗透膜组件积极生物污染到不同程度，通过添加可生物降解的营养物质的进料流，揭示了一个微妙的进料通道压降增加。容易获得的EF NMR参数（信号弛豫参数T-1，T-2和修改为仅对停滞流体敏感的总NMR信号）被测量和分析，在它们的能力，以检测生物污垢的开始。的[F。核磁共振表明，膜组件入口附近的污染显着扭曲通过整个膜组件的流场。总NMR信号被证明是适合于螺旋缠绕膜组件的非破坏性的早期生物污染检测，它是容易部署在高（操作）流速，是特别敏感的流场变化，由于生物污染，并可以部署在任何位置沿着膜组件轴。除了提供早期结垢检测之外，移动的EF NMR装置还可以用于（i）评估螺旋缠绕膜组件的生产过程，和（ii）提供组件清洁过程效率的原位测定。(C)© 2015 Elsevier B. V.版权所有
We demonstrate the use of Earth's field (EF) Nuclear Magnetic Resonance (NMR) to provide early non-destructive detection of active biofouling of a commercial spiral wound reverse osmosis (RO) membrane module. The RO membrane module was actively biofouled to different extents, by the addition of biodegradable nutrients to the feed stream, as revealed by a subtle feed-channel pressure drop increase. Easily accessible EF NMR parameters (signal relaxation parameters T-1, T-2 and the total NMR signal modified to be sensitive to stagnant fluid only) were measured and analysed in terms of their ability to detect the onset of biofouling. The [F. NMR showed that fouling near the membrane module entrance significantly distorted the flow field through the whole membrane module. The total NMR signal is shown to be suitable for non-destructive early biofouling detection of spiral wound membrane modules, it was readily deployed at high (operational) flow rates, was particularly sensitive to flow field changes due to biofouling and could be deployed at any position along the membrane module axis. In addition to providing early fouling detection, the mobile EF NMR apparatus could also be used to (i) evaluate the production process of spiral wound membrane modules, and (ii) provide an in situ determination of module cleaning process efficiency. (C) 2015 Elsevier B.V. All rights reserved,