Biofouling of spiral-wound nanofiltration and reverse osmosis membranes: A feed spacer problem
Biofouling of spiral-wound nanofiltration and reverse osmosis membranes: A feed spacer problem
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DOI：
10.1016/j.watres.2008.11.019
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发表时间：
2009-02-01
期刊：
影响因子：
12.8
通讯作者：
van Loosdrecht, M. C. M.
中科院分区：
文献类型：
--
作者：
Vrouwenvelder, J. S.;von der Schulenburg, D. A. Graf;van Loosdrecht, M. C. M.
通过常规方法和磁共振成像（MRI），在全尺寸和中试规模的装置、试验台和膜污染监测器中研究了生物污染。独立于渗透物生产，在纳米过滤中试装置中，进料间隔通道压降和生物质浓度类似地增加。在进料间隔件的存在下，由生物质积累引起的绝对进料通道压降增加比不存在进料间隔件时高得多：在螺旋缠绕纳滤和反渗透系统中，生物结垢主要是进料间隔件问题。该结论基于（i）污垢累积的原位视觉观察，（ii）使用MRI的污垢累积和速度分布曲线的原位非破坏性观察，以及（iii）具有和不具有进料间隔器的监测器中的压降和生物质发展的差异。MRI研究表明，即使是有限的生物膜上的进料通道间隔物的积累强烈影响的速度分布曲线。生物结垢的控制应着重于开发低结垢的进料间隔器和水动力条件，以限制生物质积累对进料通道压降增加的影响。(C)2008爱思唯尔有限公司保留所有权利。
Biofouling was studied in full-scale and pilot-scale installations, test-rigs and membrane fouling monitors by conventional methods as well as Magnetic Resonance Imaging (MRI). independent of permeate production, the. feed spacer channel pressure drop and biomass concentration increased similarly in a nanofiltration pilot installation. In the presence of a feed spacer the absolute feed channel pressure drop increase caused by biomass accumulation was much higher than when a feed spacer was absent: in both spiral wound nanofiltration and reverse osmosis systems biofouling is dominantly a feed spacer problem. This conclusion is based on (i) in situ visual observations of the fouling accumulation, (ii) in-situ non-destructive observations of the fouling accumulation and velocity distribution profiles using MRI, and (iii) differences in pressure drop and biomass development in monitors with and without feed spacer. MRI studies showed that even a restricted biofilm accumulation on the feed channel spacer influenced the velocity distribution profile strongly. Biofouling control should be focused on the development of low fouling feed spacers and hydrodynamic conditions to restrict the impact of biomass accumulation on the feed channel pressure drop increase. (C) 2008 Elsevier Ltd. All rights reserved.