Contribution of stratified extracellular polymeric substances to the gel-like and fractal structures of activated sludge

被引：75

作者：

Yuan, D. Q. ^{[1
]}

Wang, Y. L. ^{[1
]}

Feng, J. ^{[1
]}

机构：

[1] Beijing Forestry Univ, Beijing Key Lab Source Control Technol Water Poll, Coll Environm Sci & Engn, Beijing 100083, Peoples R China

来源：

WATER RESEARCH | 2014年 / 56卷

基金：

中国国家自然科学基金;

关键词：

Activated sludge; Stratified extracellular polymeric substances; Gel-like structure; Fractal structure; Conceptual sludge model; RHEOLOGICAL PROPERTIES; ENZYMATIC DEGRADATION; DIGESTED-SLUDGE; GRANULAR SLUDGE; SEWAGE SLUDGES; PART I; FLOCS; WATER; EPS; EXOPOLYSACCHARIDE;

D O I：

10.1016/j.watres.2014.02.028

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The gel-like and fractal structures of activated sludge (AS) before and after extracellular polymeric substances (EPS) extraction as well as different EPS fractions were investigated. The contributions of individual components in different EPS fractions to the gel-like behavior of sludge samples by enzyme treatment were examined as well. The centrifugation and ultrasound method was employed to stratify the EPS into slime, loosely and tightly bound EPS (LB- and TB-EPS). It was observed that all samples behaved as weak gels with weak-link. TB-EPS and AS after LB-EPS extraction showed the strongest elasticity in higher concentrations and highest mass fractal dimension, which may indicate the key role of TB-EPS in the gel-like and fractal structures of the sludge. Effects of protease or amylase on the gel-like property of sludge samples differed in the presence of different EPS fractions. (c) 2014 Elsevier Ltd. All rights reserved.

引用

页码：56 / 65

页数：10

共 52 条

[1] Extracellular polymeric substances and structural stability of aerobic granule [J].

Adav, Sunil S. ;

Lee, Duu-Jong ;

Tay, Joo-Hwa .

WATER RESEARCH, 2008, 42 (6-7) :1644-1650

[2]

[Anonymous], 2005, Standard methods for the examination of water and waste- water

[3] Toward efficient sludge processing using novel rheological parameters: dynamic rheological testing [J].

Ayol, A. ;

Dentel, S. K. ;

Filibell, A. .

WATER SCIENCE AND TECHNOLOGY, 2006, 54 (05) :17-22

[4]

Clark A. H., 1987, BIOPOLYMERS, P57

[5] Relations between extraction protocols for activated sludge extracellular polymeric substances (EPS) and EPS complexation properties Part I. Comparison of the efficiency of eight EPS extraction methods [J].

Comte, S ;

Guibaud, G ;

Baudu, M .

ENZYME AND MICROBIAL TECHNOLOGY, 2006, 38 (1-2) :237-245

[6] Enzymatic degradation of formaldehyde-crosslinked gelatin [J].

Dalev, P ;

Vassileva, E ;

Mark, JE ;

Fakirov, S .

BIOTECHNOLOGY TECHNIQUES, 1998, 12 (12) :889-892

[7] Chemical description of extracellular polymers: Implication on activated sludge floc structure [J].

Dignac, MF ;

Urbain, V ;

Rybacki, D ;

Bruchet, A ;

Snidaro, D ;

Scribe, P .

WATER SCIENCE AND TECHNOLOGY, 1998, 38 (8-9) :45-53

[8]

Dursun D., 2007, GEL LIKE BEHAV BIOSO

[9] The impact of concentration, temperature and pH on dynamic rheology of psyllium gels [J].

Farahnaky, A. ;

Askari, H. ;

Majzoobi, M. ;

Mesbahi, Gh. .

JOURNAL OF FOOD ENGINEERING, 2010, 100 (02) :294-301

[10]

FORSTER CF, 1983, J CHEM TECH BIOT B, V33, P76

← 1 2 3 4 5 6 →