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Purification of high ammonia wastewater in a biofilm airlift loop bioreactor with microbial communities analysis

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Abstract

A 70 m3 gas–liquid–solid three-phase flow airlift loop bioreactor, in which biofilm attached on granular active carbon carriers, was used for purification of the high ammonia wastewater from bioethanol production. Under the optimum operating conditions, COD and NH4 +-N average removal rate of 89.0 and 98.6 % were obtained at hydraulic retention time of 10 h. Scanning electron microscopy was applied for observation of the biofilm formation. High contaminants removal efficiency was achieved by holding high biomass concentration in the reactor due to the attached biofilm over the carriers. The 16S rRNA gene clone library analysis indicated that 68.6 % of the clones were affiliated with the two phyla Bacteroidetes and Proteobacteria, and residual clones clustered with various sequences from uncultured bacteria. The presence of various anoxic/anaerobic bacteria indicated that the oxygen gradient inside the biofilm could provide appropriate micro-environment for nitrogen removal through simultaneous nitrification and denitrification.

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Abbreviations

ALR:

Airlift loop bioreactor

BPS:

Baffle plate separator

COD:

Chemical oxygen demand

DO:

Dissolved oxygen

GAC:

Granular active carbon

HRT:

Hydraulic retention time

ID:

Internal diameter

NLR:

Nitrogen loading rate

OTU:

Operational taxonomic unit

SAA:

Soaking in aqueous ammonia

SEM:

Scanning electron microscopy

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Acknowledgments

The authors wish to acknowledge the financial support provided by the National Natural Science Foundation of China (No. 21206106), the High School Science & Technology Fund Planning Project of Tianjin education committee, China (No. 20130515), and Research Fund of Tianjin Key Laboratory of Aquatic Science and Technology.

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Correspondence to Chunsheng Qiu.

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Qiu, C., Zhang, D., Sun, L. et al. Purification of high ammonia wastewater in a biofilm airlift loop bioreactor with microbial communities analysis. World J Microbiol Biotechnol 31, 49–57 (2015). https://doi.org/10.1007/s11274-014-1763-4

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  • DOI: https://doi.org/10.1007/s11274-014-1763-4

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