Responses of flocculent and granular sludge in anaerobic sequencing batch reactors (ASBRs) to azithromycin wastewater and its impact on microbial communities

BACKGROUND Azithromycin (AZM), a 15‐member macrolide antibiotic, has caused widespread pollution in China, where anaerobic digestion is the predominant wastewater treatment technology. However, the type of anaerobic sludge most suitable for treating antibiotic wastewater is unclear. Therefore, this...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2018-08, Vol.93 (8), p.2341-2350
Main Authors: Liu, Peng‐yu, Chen, Jia‐rong, Shao, Lei, Tan, Jun, Chen, Dai‐jie
Format: Article
Language:English
Subjects:
Anaerobic digestion
anaerobic flocculent sludge
anaerobic granular sludge
Anaerobic microorganisms
Anaerobic treatment
Antibiotics
Azithromycin
Bacteroidetes
Batch reactors
Biodegradation
Bioreactors
Cell death
Chemical oxygen demand
Exposure
Microbial activity
microbial community
Microbiomes
Microorganisms
Next-generation sequencing
Organic chemistry
Proteobacteria
Reactive oxygen species
Reactors
Sequencing batch reactor
Sludge
Wastewater treatment
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Summary:BACKGROUND Azithromycin (AZM), a 15‐member macrolide antibiotic, has caused widespread pollution in China, where anaerobic digestion is the predominant wastewater treatment technology. However, the type of anaerobic sludge most suitable for treating antibiotic wastewater is unclear. Therefore, this study aimed to determine the response of anaerobic flocculent and granular sludge to AZM wastewater, and, using a high‐throughput sequencing technique, to explain the diverse microbial community structures. RESULTS Anaerobic granular sludge provided better resistance to the decline of chemical oxygen demand (COD) removal caused by AZM and greater biodegradation efficiency than flocculent sludge. Furthermore, there was stronger resistance to AZM‐induced reactive oxygen species in the granular sludge than in the flocculent sludge. The granular sludge exhibited richer microbial communities than the flocculent sludge after AZM exposure to the phylum Proteobacteria and Bacteroidetes. CONCLUSION At high AZM concentration, anaerobic granular sludge was superior to flocculent sludge in COD removal and AZM degradation. This is attributed to less cell death and greater microbial diversity and richness in the granular sludge than in the flocculent sludge following exposure to AZM. Proteobacteria and Bacteroidetes contributed to the resistance to AZM in the granular sludge. © 2018 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.5578