Abstract
The efficiency of a novel integrated treatment system for biological removal of ammonium, nitrite, nitrate, and heavy metals from fossil power plant effluent was evaluated. Microbial communities were analyzed using bacterial and archaeal 16S rRNA gene clone libraries (Sanger sequences) and 454 pyrosequencing technology. While seasonal changes in microbial community composition were observed, the significant (P = 0.001) changes in bacterial and archaeal communities were consistent with variations in ammonium concentration. Phylogenetic analysis of 16S rRNA gene sequences revealed an increase of potential ammonium-oxidizing bacteria (AOB), Nitrosomonas, Nitrosococcus, Planctomycetes, and OD1, in samples with elevated ammonium concentration. Other bacteria, such as Nitrospira, Nitrococcus, Nitrobacter, Thiobacillus, ε-Proteobacteria, Firmicutes, and Acidobacteria, which play roles in nitrification and denitrification, were also detected. The AOB oxidized 56 % of the ammonium with the concomitant increase in nitrite and ultimately nitrate in the trickling filters at the beginning of the treatment system. Thermoprotei within the phylum Crenarchaeota thrived in the splitter box and especially in zero-valent iron extraction trenches, where an additional 25 % of the ammonium was removed. The potential ammonium-oxidizing Archaea (AOA) (Candidatus Nitrosocaldus) were detected towards the downstream end of the treatment system. The design of an integrated treatment system consisting of trickling filters, zero-valent iron reaction cells, settling pond, and anaerobic wetlands was efficient for the biological removal of ammonium and several other contaminants from wastewater generated at a coal burning power plant equipped with selective catalytic reducers for nitrogen oxide removal.
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Acknowledgments
This research was sponsored by the U. S. Department of Energy Office of Fossil Energy and Office of Science Biological and Environmental Research, Environmental Remediation Sciences Program and performed at Oak Ridge National Laboratory (ORNL). ORNL is managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-00OR22725. We thank Zamin Yang and Marilyn Kerley for help with 454 FLX pyrosequencing and Sanger sequencing, respectively. We would also like to thank Alan Mays, David Lane, Mark Wolfe, and Roy Quinn of TVA for help with sampling and maintaining the ATOXIC/ASSET field sites.
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Vishnivetskaya, T.A., Fisher, L.S., Brodie, G.A. et al. Microbial Communities Involved in Biological Ammonium Removal from Coal Combustion Wastewaters. Microb Ecol 66, 49–59 (2013). https://doi.org/10.1007/s00248-012-0152-5
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DOI: https://doi.org/10.1007/s00248-012-0152-5