标题：Role of extracellular polymeric substances in biosorption of dye wastewater using aerobic granular sludge
作者：Wei, Dong; Wang, Bingfeng; Ngo, Huu Hao; Guo, Wenshan; Han, Fei; Wang, Xiaodong; Du, Bin; Wei, Qin
作者机构：[Wei, Dong; Wang, Bingfeng; Han, Fei; Wang, Xiaodong; Du, Bin] Univ Jinan, Sch Resources & Environm Sci, Jinan 250022, Peoples R China.; [Ngo, Huu H 更多
通讯作者地址：[Du, B]Univ Jinan, Sch Resources & Environm Sci, Jinan 250022, Peoples R China.
关键词：Aerobic granular sludge; Extracellular polymeric substances (EPS);; Biosorption; Excitation-emission matrix (EEM); Dye wastewater
摘要：In this study, the role of extracellular polymeric substances (EPS) in biosorption of dye wastewater was evaluated using aerobic granular sludge as biosorbent. Based on the experimental data, the removal efficiencies of methylene blue (MB) by EPS and Sludge were 9.38 and 80.72%, respectively, implying that EPS made a certain contribution for MB removal. The adsorption rates of EPS, Sludge, and total Sludge + EPS for MB were better fitted with pseudo-second order kinetic model, and the equilibrium adsorption isotherm data agreed well with Langmuir model. The interaction between EPS and MB was explored by a combined three-dimensional excitation-emission matrix (3D-EEM) and synchronous fluorescence spectra. 3D-EEM indicated that protein-and humic acid-like substances were the main peaks of EPS, and gradually quenched with increased MB concentrations. According to synchronous fluorescence spectra, the main fluorescence quenching was caused by tryptophan residues, and the type belonged to a combined dynamic and static quenching. (C) 2015 Elsevier Ltd. All rights reserved.