Abstract
Two pyridine-degrading bacteria and two quinoline-degrading bacteria were introduced for bioaugmentation to treat the coking wastewater. Sequencing batch reactors (SBRs) were used for a comparative study on the treatment efficiency of pyridine, quinoline, and chemical oxygen demand. Results showed that the treatment efficiency with coking-activated sludge plus a mixture of the four degrading bacteria was much better than that ones with coking-activated sludge only or mixed degrading bacteria only. Moreover, a 52-day continuous operation of the bioaugmented and general SBRs was investigated. The bioaugmented SBR showed better treatment efficiency and stronger capacity to treat high pyridine and quinoline shock loading. The general SBR failed to cope with the shock loading, and the biomass of the activated sludge decreased significantly. In order to monitor the microbial ecological variation during the long-term treatment, the bacterial community in both reactors was monitored by the amplicon length heterogeneity polymerase chain reaction technique. The diversity of the bacterial community decreased in both reactors, but the introduced highly efficient bacteria were dominant in the bioaugmented SBR. Our experiment showed clearly that the use of highly efficient bacteria in SBR process could be a feasible method to treat wastewater containing pyridine or/and quinoline.
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Acknowledgements
This study was supported by an “863” Exploration Project (no. 2006AA06Z336) granted by the Chinese Ministry of Science and Technology and a general project (no. 50878001) granted by the Chinese National Science Foundation. We sincerely thank Dr. Zbigniew Cichacz in the Biodesign Institute at Arizona State University for carefully checking the paper.
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Bai, Y., Sun, Q., Zhao, C. et al. Bioaugmentation treatment for coking wastewater containing pyridine and quinoline in a sequencing batch reactor. Appl Microbiol Biotechnol 87, 1943–1951 (2010). https://doi.org/10.1007/s00253-010-2670-8
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DOI: https://doi.org/10.1007/s00253-010-2670-8