Novel insights into sludge dewaterability by fluorescence excitation-emission matrix combined with parallel factor analysis.
Novel insights into sludge dewaterability by fluorescence excitation-emission matrix combined with parallel factor analysis.
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DOI：
10.1016/j.watres.2009.10.021
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发表时间：
2010-02
期刊：
影响因子：
12.8
通讯作者：
Guang-Hui Yu;P. He;L. Shao
中科院分区：
文献类型：
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作者：
Guang-Hui Yu;P. He;L. Shao
污泥脱水是减少污泥体积、改善污泥处理性能的重要手段。本文采用荧光激发发射矩阵(EEM)和平行因子分析(PARAFAC)相结合的方法来研究影响污泥脱水性能的因素。收集了11个污水处理厂的污泥絮体，将其分层为不同的胞外聚合物(EPS)组分，并对其荧光特征进行了表征。采用归一化毛细抽吸时间(CST)和比过滤阻力(SRF)测定污泥的脱水性能。结果表明，紧密结合组分的荧光光谱不受污染源的影响。相反，松散结合组分的荧光峰则受污染源的影响。通过PARAFAC分析，所有的荧光EEM都可以成功地分解成一个六组分模型。归一化CST和SRF与上清组分中的组分1[激发/发射(Ex/Em)=(220,275)/350]显著相关，粘液和Lb-EPS组分中的组分5[Ex/Em=(230,280)/430]和组分6[Ex/Em=(250,360)/460]显著相关。这些结果表明，除类蛋白质物质(组分1)外，污泥的脱水性能还受到黏液和LBEPS组分中类腐植酸和富里酸类物质(组分5和6)的影响。此外，本文还提出了一种研究污泥脱水性能的简便方法(即EEM-PARAFAC)。
Sludge dewatering is of major interest in sludge volume reduction and handling properties improvement. Here we report an approach of fluorescence excitation–emission matrix (EEM) combined with parallel factor (PARAFAC) analysis to elucidate the factors that influence sludge dewaterability. Sludge flocs from 11 full-scale wastewater treatment plants were collected to stratify into different extracellular polymeric substances (EPS) fractions and then to characterize their fluorescence EEMs. Both the normalized capillary suction time (CST) and specific resistance to filtration (SRF) were applied to determine sludge dewaterability. The results showed that fluorescence EEMs of tightly bound fractions were not affected by the wastewater sources. In contrast, fluorescence EEMs of loosely bound fractions were affected by the wastewater sources. All the fluorescence EEMs could be successfully decomposed into a six-component model by PARAFAC analysis. Both normalized CST and SRF were significantly correlated with component 1 [excitation/emission (Ex/Em)=(220, 275)/350] in the supernatant fraction, with components 5 [Ex/Em=(230, 280)/430] and 6 [Ex/Em=(250, 360)/460] in the slime and LB-EPS fraction. These results reveal that except for proteins-like substances (component 1), sludge dewaterability is also affected by humic acid-like and fulvic acid-like substances (components 5 and 6) in the slime and LB-EPS fractions. Furthermore, this paper presents a promising and facile approach (i.e., EEM-PARAFAC) for investigating sludge dewaterability.