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. 2016 Jun 16;5(1):741. doi: 10.1186/s40064-016-2392-1

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Reactor performance during the study. a Changes in nitrogen concentrations; b changes in NLR and NLRR; c ratios of inf. NO₂-N/NH₄-N, eff. NO₂-N removal/NH₄-N removal, and eff. NO₃-N production/NH₄-N removal. Inf. influent, Eff. effluent