Novel insights into sludge dewaterability by fluorescence excitation-emission matrix combined with parallel factor analysis

Water Research
Guang-Hui YuLi-Ming Shao

Abstract

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 p...Continue Reading

Citations

Aug 12, 2014·Environmental Monitoring and Assessment·Jianguo JiangYujing Zhang
Oct 1, 2013·Ecotoxicology and Environmental Safety·Huacheng XuHelong Jiang
Jul 2, 2015·Applied Biochemistry and Biotechnology·Kun LuoXing-Sheng Liao
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