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Role of extracellular polymeric substances in biosorption of dye wastewater using aerobic granular sludge.
机构信息
School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, PR China.
School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.
出版信息
Bioresour Technol. 2015 Jun;185:14-20. doi: 10.1016/j.biortech.2015.02.084. Epub 2015 Feb 26.
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.
在这项研究中，我们使用好氧颗粒污泥作为生物吸附剂，评估了细胞外聚合物（EPS）在染料废水生物吸附中的作用。根据实验数据，EPS 和污泥对亚甲蓝（MB）的去除效率分别为 9.38%和 80.72%，这表明 EPS 对 MB 的去除有一定的贡献。EPS、污泥和总污泥+EPS 对 MB 的吸附速率更符合准二级动力学模型，平衡吸附等温线数据与朗缪尔模型吻合较好。通过三维激发-发射矩阵（3D-EEM）和同步荧光光谱研究了 EPS 和 MB 之间的相互作用。3D-EEM 表明，蛋白质和腐殖酸类物质是 EPS 的主要峰，并且随着 MB 浓度的增加逐渐被猝灭。根据同步荧光光谱，主要的荧光猝灭是由色氨酸残基引起的，类型属于动态和静态的混合猝灭。
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