Characterization of organic membrane foulants in a submerged membrane bioreactor with pre-ozonation using three-dimensional excitation-emission matrix fluorescence spectroscopy
Characterization of organic membrane foulants in a submerged membrane bioreactor with pre-ozonation using three-dimensional excitation-emission matrix fluorescence spectroscopy
复制标题
使用三维激发发射矩阵荧光光谱表征预臭氧化浸没式膜生物反应器中的有机膜污染物
DOI：
10.1016/j.watres.2010.12.023
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发表时间：
2011-02-01
期刊：
影响因子：
12.8
通讯作者：
You, Shi-jie
中科院分区：
文献类型：
--
作者：
Liu, Ting;Chen, Zhong-lin;You, Shi-jie
本研究的重点是有机膜污染物在浸没式膜生物反应器（MBR）工艺与预臭氧化相比，一个单独的MBR使用三维激发发射矩阵（EEM）荧光光谱。在正常投加量下连续臭氧氧化进水，后续膜生物反应器对有机物的去除效果较好，且膜压力的增加速率远低于单独膜生物反应器。利用EEM荧光光谱技术对溶解性有机物（DOM）、胞外聚合物（EPS）和膜污染物进行了表征。两种MBR中DOM样品的EEM荧光光谱均出现4个主峰。其中两个峰与类蛋白质荧光团有关，另一个峰与类腐殖酸荧光团有关。结果表明，预臭氧氧化降低了进水DOM EEM光谱中各峰的荧光强度，尤其是类蛋白质，并使各荧光峰发生不同程度的红移。臭氧预氧化后，EPS中类蛋白质的峰强度明显降低，峰T-1和峰T-2为代表。臭氧预氧化可以有效地减轻内外污染。预臭氧化膜生物反应器的主要污染物是腐殖酸类物质（C峰），单独膜生物反应器的主要污染物是蛋白质类物质（T-1峰）。从EEM荧光光谱中观察到，臭氧预氧化后，表面污染物中类蛋白质含量减少，类腐殖酸结构发生变化。然而，可以看出，臭氧化导致的EEM荧光光谱的强度显着降低，但几乎没有位置移动的所有峰的内部污垢。(C)2010爱思唯尔有限公司保留所有权利。
This study focuses on organic membrane foulants in a submerged membrane bioreactor (MBR) process with pre-ozonation compared to an individual MBR using three-dimensional excitation emission matrix (EEM) fluorescence spectroscopy. While the influent was continuously ozonated at a normal dosage, preferable organic matter removal was achieved in subsequent MBR, and trans-membrane pressure increased at a much lower rate than that of the individual MBR. EEM fluorescence spectroscopy was employed to characterize the dissolved organic matter (DOM) samples, extracellular polymeric substance (EPS) samples and membrane foulants. Four main peaks could be identified from the EEM fluorescence spectra of the DOM samples in both MBRs. Two peaks were associated with the protein-like fluorophores, and the other ones were related to the humic-like fluorophores. The results indicated that pre-ozonation decreased fluorescence intensities of all peaks in the EEM spectra of influent DOM especially for protein-like substances and caused red shifts of all fluorescence peaks to different extents. The peak intensities of the protein-like substances represented by Peak T-1 and T-2 in EPS spectra were obviously decreased as a result of pre-ozonation. Both external and internal fouling could be effectively mitigated by the pre-ozonation. The most primary component of external foulants was humic acid-like substance (Peak C) in the MBR with pre-ozonation and protein-like substance (Peak T-1) in the individual MBR, respectively. The content decrease of protein-like substances and structural change of humic-like substances were observed in external foulants from EEM fluorescence spectra due to pre-ozonation. However, it could be seen that ozonation resulted in significant reduction of intensities but little location shift of all peaks in EEM fluorescence spectra of internal foulants. (C) 2010 Elsevier Ltd. All rights reserved.