RCEES OpenIR  > 环境水质学国家重点实验室
Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties
Peng, Sainan; Hu, Aibin; Ai, Jing; Zhang, Weijun; Wang, Dongsheng
2021-08-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume201Pages:-
AbstractExtracellular 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.
Department环境水质学国家重点实验室
KeywordExtracellular polymeric substances Waste activated sludge Macro-physical properties Variable-temperature infrared spectroscopy Freezing treatment Hydrothermal treatment
WOS Research AreaEngineering, Environmental ; Environmental Sciences ; Water Resources
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45915
Collection环境水质学国家重点实验室
Affiliation1.China Univ Geosci, Sch Environm Studies, Hubei Key Lab Environm Water Sci Yangtze River Ba, Wuhan 430074, Hubei, Peoples R China
2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
Recommended Citation
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):-.
Files in This Item: Download All
File Name/Size DocType Version Access License
Changes in molecular(9378KB)期刊论文出版稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Peng, Sainan]'s Articles
[Hu, Aibin]'s Articles
[Ai, Jing]'s Articles
Baidu academic
Similar articles in Baidu academic
[Peng, Sainan]'s Articles
[Hu, Aibin]'s Articles
[Ai, Jing]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Peng, Sainan]'s Articles
[Hu, Aibin]'s Articles
[Ai, Jing]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Changes in molecular structure of extracellular polymeric substances (EPS) with temperature in relation to sludge macro-physical properties.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.