Abstract
Partial nitrification (PN) has been considered as one of the promising processes for pretreatment of ammonium-rich wastewater. In this study, a kind of novel carriers with enhanced hydrophilicity and electrophilicity was implemented in a moving bed biofilm reactor (MBBR) to start up PN process. Results indicated that biofilm formation rate was higher on modified carriers. In comparison with the reactor filled with traditional carriers (start-up period of 21 days), it took only 14 days to start up PN successfully with ammonia removal efficiency and nitrite accumulation rate of 90 and 91%, respectively, in the reactor filled with modified carriers. Evident changes of spatial distributions and community structures had been detected during the start-up. Free-floating cells existed in planktonic sludge, while these microorganisms trended to form flocs in the biofilm. High-throughput pyrosequencing results indicated that Nitrosomonas was the predominant ammonia-oxidizing bacterium (AOB) in the PN system, while Comamonas might also play a vital role for nitrogen oxidation. Additionally, some other bacteria such as Ferruginibacter, Ottowia, Saprospiraceae, and Rhizobacter were selected to establish stable footholds. This study would be potentially significant for better understanding the microbial features and developing efficient strategies accordingly for MBBR-based PN operation.
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We thank Hong-lei Zhan from Stevens Institution of Technology for providing language help.
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This study was funded by the National Natural Science Foundation of China (grant number 51408095), the China Postdoctoral Science Foundation (grant numbers 2014M561236, 2015T80257), the Foundation of Liaoning Educational Committee (grant number L2014021), and the Fundamental Research Funds for the Central Universities (grant number DUT16RC(4)13).
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Liu, T., Mao, Yj., Shi, Yp. et al. Start-up and bacterial community compositions of partial nitrification in moving bed biofilm reactor. Appl Microbiol Biotechnol 101, 2563–2574 (2017). https://doi.org/10.1007/s00253-016-8003-9
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DOI: https://doi.org/10.1007/s00253-016-8003-9