The difference in characteristics of foulants in submerged MBRs caused by the difference in the membrane flux
The difference in characteristics of foulants in submerged MBRs caused by the difference in the membrane flux
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DOI：
10.1016/j.desal.2007.10.030
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发表时间：
2008-10
期刊：
影响因子：
9.9
通讯作者：
K. Kimura;T. Miyoshi;T. Naruse;N. Yamato;R. Ogyu;Y. Watanabe
中科院分区：
文献类型：
--
作者：
K. Kimura;T. Miyoshi;T. Naruse;N. Yamato;R. Ogyu;Y. Watanabe
膜生物反应器（MBR）用于废水处理的更广泛使用的主要障碍是膜污染，这增加了操作成本。为了更有效地控制膜生物反应器中的膜污染，了解膜污染的机理是重要的。以真实的城市污水为研究对象，采用傅里叶变换红外光谱（FTIR）、13 C核磁共振（NMR）、单糖组成和氨基酸分析等方法，研究了膜生物反应器中膜通量对污染物特性的影响。在每个实验中，两个相同的膜组件浸没在同一MBR池中，并在不同的膜通量下运行。研究结果表明，膜过滤通量对膜生物反应器的膜污染有显著影响。以过滤后的混合液悬浮液的体积为基准，以较高通量操作的组件中的膜污染远大于其它组件。从污染的膜解吸的污垢的分析表明，污垢的性质显着不同的膜通量，尽管事实上，这两个模块过滤相同的混合液悬浮液在同一时间。在两个单独的实验中，由膜通量的差异引起的污垢的特性的差异是相似的，这表明数据的再现性是足够的。据认为，不同比例的混合液悬浮液被输送到膜的表面取决于膜通量，随后引起膜污染的不同程度。从以较高通量操作的膜解吸的污垢物似乎比从另一膜解吸的污垢物引起更大的污垢。
The main obstacle for a wider use of membrane bioreactors (MBRs) for wastewater treatment is membrane fouling, which increases operating costs. For a more efficient control of membrane fouling in MBRs, an understanding of the mechanisms of membrane fouling is important. We conducted two separate pilot-scale experiments using real municipal wastewater to investigate the influence of the membrane flux in MBRs on the characteristics of foulants, which were analyzed by Fourier transform infrared (FTIR) spectra,13C nuclear magnetic resonance (NMR) spectra, monosaccharide composition and amino acid analyses. In each experiment, two identical membrane modules were submerged in the same MBR tank and were operated under different membrane fluxes. The results obtained in this study indicated that the membrane filtration flux significantly influenced membrane fouling in MBRs. Membrane fouling in the module operated with the higher flux was much greater than that of the other on the basis of the volume of filtered mixed liquor suspension. Analyses of the foulants desorbed from the fouled membranes revealed that the nature of the foulants significantly differed depending on the membrane flux despite the fact that the two modules filtered the same mixed liquor suspension at the same time. The difference in characteristics of the foulants caused by the difference in the membrane flux was similar in the two separate experiments, indicating that reproducibility of the data was sufficient. It was thought that different fractions of the mixed liquor suspension were transported to the surfaces of the membranes depending on the membrane flux and subsequently caused membrane fouling to different extents. The foulant desorbed from the membrane operated with a higher flux seemed to cause severer fouling than the foulant desorbed from the other membrane.