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Effects of extracellular polymer substances on aerobic granulation in sequencing batch reactors

WANG Zhi-ping LIU Li-li YAO Jie SUN Li-xin CAI Wei-min

哈尔滨工业大学学报（英文版）2009，Vol.16Issue(1)：145-148,4.

Effects of extracellular polymer substances on aerobic granulation in sequencing batch reactors

WANG Zhi-ping ¹LIU Li-li ²YAO Jie ³SUN Li-xin ¹CAI Wei-min¹

作者信息

1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
2. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
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摘要

Abstract

The effects of extracellular polymeric substances (EPS) on aerobic granulation in sequencing batch reactors (SBR) were investigated by evaluating the EPS content, and the relationship between EPS composition and surface properties of glucose-fed aerobic granules. The results show that aerobic granular sludge contains more EPS than seed sludge, and it is about 47 mg/gMLSS. Corresponding to the changes of EPS, the surface charge of microorganisms in granules increases from -0. 732 to -0. 845 meq/gMLSS, whereas the hydrophobicry changes significantly from 48.46% to 73. 16%. It is obviously that changes of EPS in sludge alter the negative surface charge and hydrophobieity of microorganisms in granules, enhance the polymeric interaction and promote the aerobic granulation. Moreover, EPS can serve as carbon and energy reserves in granulation, thus the growth between the interior and exterior bacteria is balanced, and the integrality of granules is maintained.SEM observation of the granules exhibits that EPS in granules are ropy ; by mixing with bacteria, compact matrix structure can be formed. The distribution of EPS in granules profiles the importance of EPS storage. It can be concluded that EPS play a crucial role in aerobic granulation.

关键词

extracellular polymeric substances/aerobic granulation/hydrophobicity/surface charge

Key words

extracellular polymeric substances/aerobic granulation/hydrophobicity/surface charge

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引用本文复制引用

WANG Zhi-ping,LIU Li-li,YAO Jie,SUN Li-xin,CAI Wei-min..Effects of extracellular polymer substances on aerobic granulation in sequencing batch reactors[J].哈尔滨工业大学学报（英文版）,2009,16(1):145-148,4.

基金项目

Sponsored by the National Natural Science Foundation of China (Grant No.50778110) and Shanghai "Chenguang" Program (Grant No.2007CG39). （Grant No.50778110）

哈尔滨工业大学学报（英文版）

ISSN：1005-9113

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