Role and significance of extracellular polymeric substances on the property of aerobic granule
2011; Elsevier BV; Volume: 107; Linguagem: Inglês
10.1016/j.biortech.2011.12.008
ISSN1873-2976
AutoresLiang Zhu, Mei-le Lv, Xin Dai, Yanwen Yu, Han-ying Qi, Xiangyang Xu,
Tópico(s)Microbial Fuel Cells and Bioremediation
ResumoBecause 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 2.4 cm s(-1) and settling time at 5-10 min) 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.
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