Role and significance of extracellular polymeric substances on the property of aerobic granule

► Higher amounts of the PN are found in the EPS extracted from aerobic granule. ► Variation in granular settleability is due to changes of PN content and superficial property of aerobic granule. ► Granulation time and behavior of aerobic granule are dependent on the key operating parameters. Because...

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Bibliographic Details
Published in:Bioresource technology 2012-03, Vol.107, p.46-54
Main Authors: Zhu, Liang, Lv, Mei-le, Dai, Xin, Yu, Yan-wen, Qi, Han-ying, Xu, Xiang-yang
Format: Article
Language:English
Subjects:
Acetates
Acetates - chemistry
Aerobic granule
Aerobiosis
Aniline Compounds - chemistry
Bioreactors
DNA
EPS
Exopolymeric protein (PN)
Extracellular polymeric substances (EPS)
gases
Glucose - chemistry
Granular materials
Granules
hydrophobicity
Key operating parameter
Microorganisms
Polymers - chemistry
polysaccharides
Polystyrene resins
proteins
Settling
Sewage
Sludge
Superficial property
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Summary:► Higher amounts of the PN are found in the EPS extracted from aerobic granule. ► Variation in granular settleability is due to changes of PN content and superficial property of aerobic granule. ► Granulation time and behavior of aerobic granule are dependent on the key operating parameters. Because of the important role of extracellular polymeric substances (EPS) in microbial aggregates, the relationship of the EPS and physico-chemical properties of aerobic granule was studied in two sequencing airlift bioreactors (SABR) using two kinds of substrates, acetate+glucose and 4-chloroaniline (4-ClA). Higher amounts of the exopolymeric protein (PN) and lower polysaccharides (PS) and DNA level were extracted from aerobic granules in the SABRs, and the variations in the PN and PN/PS of aerobic granules were higher (770% and 360%) in the SABR using 4-ClA as substrate than that in the other reactor. At the same time, suitable operating parameters (surface gas velocity at about 2.4cms−1 and settling time at 5–10min) favored EPS production and sludge granulation. Furthermore, the minimal settling velocity, hydrophobicity, surface charge increased in accordance with PN content increase, and a negative correlation between the sludge volume index (SVI) and PN content was observed.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2011.12.008