Simultaneous ammonia and nitrate removal in an airlift reactor using poly(butylene succinate) as carbon source and biofilm carrier

•Simultaneous ammonia and nitrate removal was achieved in one airlift reactor.•DNRA and sulfate reduction were inhibited by intermittent aeration treatment.•Denitrification rate was improved by aeration compared with anoxic condition.•Heterotrophic nitrification was considered a potential ammonia me...

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Bibliographic Details
Published in:Bioresource technology 2016-09, Vol.216, p.1004-1013
Main Authors: Ruan, Yun-Jie, Deng, Ya-Le, Guo, Xi-Shan, Timmons, Michael B., Lu, Hui-Feng, Han, Zhi-Ying, Ye, Zhang-Ying, Shi, Ming-Ming, Zhu, Song-Ming
Format: Article
Language:English
Subjects:
Airlift reactor
Ammonia - analysis
Ammonia - chemistry
Ammonia - isolation & purification
Ammonia - metabolism
Azoarcus
Biofilms
Bioreactors
Butylene Glycols - chemistry
Denitrification
Dissolved oxygen
Nitrates - analysis
Nitrates - chemistry
Nitrates - isolation & purification
Nitrates - metabolism
Nitrification
Nitrogen removal
Polymers - chemistry
Recirculating aquaculture system
Salinity
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Summary:•Simultaneous ammonia and nitrate removal was achieved in one airlift reactor.•DNRA and sulfate reduction were inhibited by intermittent aeration treatment.•Denitrification rate was improved by aeration compared with anoxic condition.•Heterotrophic nitrification was considered a potential ammonia metabolic pathway. In this study, an airlift inner-loop sequencing batch reactor using poly(butylene succinate) as the biofilm carrier and carbon source was operated under an alternant aerobic/anoxic strategy for nitrogen removal in recirculating aquaculture system. The average TAN and nitrate removal rates of 47.35±15.62gNH4–Nm−3d−1 and 0.64±0.14kgNO3–Nm−3d−1 were achieved with no obvious nitrite accumulation (0.70±0.76mg/L) and the dissolved organic carbon in effluents was maintained at 148.38±39.06mg/L. Besides, the activities of dissimilatory nitrate reduction to ammonium and sulfate reduction activities were successfully inhibited. The proteome KEGG analysis illustrated that ammonia might be removed through heterotrophic nitrification, while the activities of nitrate and nitrite reductases were enhanced through aeration treatment. The microbial community analysis revealed that denitrifiers of Azoarcus and Simplicispira occupied the dominate abundance which accounted for the high nitrate removal performance. Overall, this study broadened our understanding of simultaneous nitrification and denitrification using biodegradable material as biofilm carrier.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.06.056