The stability of aerobic granular sludge under 4-chloroaniline shock in a sequential air-lift bioreactor (SABR)

•Aerobic granular sludge technology has the potential in biological wastewater treatment.•High 4-ClA shock could cause the disintegration of aerobic granular sludge.•The granular stability is affected by the sludge EPS component and microbial community.•The decrease of specific protein contents in t...

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Veröffentlicht in:Bioresource technology 2013-07, Vol.140, p.126-130
Hauptverfasser: Zhu, Liang, Lv, Mei-le, Dai, Xin, Zhou, Jia-heng, Xu, Xiang-yang
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Sprache:eng
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Zusammenfassung:•Aerobic granular sludge technology has the potential in biological wastewater treatment.•High 4-ClA shock could cause the disintegration of aerobic granular sludge.•The granular stability is affected by the sludge EPS component and microbial community.•The decrease of specific protein contents in the sludge EPS is not good for granular stability. The aerobic granular sludge technology has a great potential in treatment of municipal wastewater and industrial wastewater containing toxic non-degradable pollutants. However, the formation and structural stability of aerobic granular sludge is susceptible to toxic shock. In the study, the effect of 4-chloroaniline (4-ClA) as a common toxic pollutant on the granular structure and performance was investigated, and the mechanism was revealed to provide more information on 4-ClA degradation with aerobic granular sludge process. The results showed that a 4-ClA shock at influent 200mgL−1 could cause the disintegration of aerobic granular sludge and decrease of the pollutant removal performance. The analysis of extracellular polymeric substances (EPS) within the mature and disintegrated granular sludge showed that the decrease of protein content in EPS, especially the components like Amide I 3-turn helix and β-sheet structures and aspartate, was not good for the stability of aerobic granular sludge. The microbial community results demonstrated that the disappearance of dominant bacteria like Kineosphaera limosa or appearance like Acinetobacter, might contribute to the reduction of EPS and disintegration of aerobic granular sludge.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2013.04.017