Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties
文献类型：期刊论文
| 作者 | Peng, Sainan; Hu, Aibin; Ai, Jing; Zhang, Weijun; Wang, Dongsheng |
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 201页码:- |
| 关键词 | Extracellular polymeric substances Waste activated sludge Macro-physical properties Variable-temperature infrared spectroscopy Freezing treatment Hydrothermal treatment |
| ISSN号 | 0043-1354 |
| 英文摘要 | Extracellular polymeric substances (EPS) are important components of activated sludge, whose content and composition have important effects on the macro-physical properties of sludge. In this study, the response of EPS in sludge to temperature (-40-200 degrees C) was systematically investigated using XAD resin fractionation, variable-temperature infrared spectra (VTIS) and two-dimensional correlation spectroscopy (2D-COS). The relationships between the molecular structure of EPS and the macro-physical properties (rheological property and dewatering performance) of waste activated sludge (WAS) at varying temperature were also established. During the freezing treatment, the solubilization of biopolymers and destruction of the hydrophilic functional groups (hydroxy, amino and carboxyl) resulted in the production of small organic matters, which enhanced EPS hydrophobicity and reduced electrostatic repulsion of sludge, and subsequent dewaterability improvement. For the hydrothermal treatment, the EPS transformation showed a two-stages reaction including stage I (70-120 degrees C) and stage II (>120 degrees C). Stage I (70-120 degrees C), a plenty of hydrophilic functional groups (hydroxy, amino and carboxyl) in EPS were exposed via the solubilization of biopolymers, which enhanced electrostatic repulsion of sludge and EPS hydrophilicity, and subsequence in deterioration of sludge dewaterability and fluidity. However, at stage II (>120 degrees C), the high temperature caused hydrolyzation of macromolecular organic matters in completely, in which the secondary structure of the protein was destroyed, causing the peptide chain to unfold. In addition, the reduction of alpha-helix and beta-sheet content and intensified Maillard reaction decreased electrostatic repulsion of sludge, thus resulted in the improvement of sludge dewaterability and fluidity. This study enriched the theoretical basis of the optimal control of sludge treatment based on temperature regulation. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences ; Water Resources |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45915]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 3.China Univ Geosci, Sch Environm Studies, Hubei Key Lab Environm Water Sci Yangtze River Ba, Wuhan 430074, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Peng, Sainan,Hu, Aibin,Ai, Jing,et al. Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties[J]. WATER RESEARCH,2021,201:-. |
| APA | Peng, Sainan,Hu, Aibin,Ai, Jing,Zhang, Weijun,&Wang, Dongsheng.(2021).Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties.WATER RESEARCH,201,-. |
| MLA | Peng, Sainan,et al."Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties".WATER RESEARCH 201(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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