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. 2020 Feb 10;17(3):1103. doi: 10.3390/ijerph17031103

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Variations in N concentration and homologous removal rate in the experiment: (A) concentration and removal rate of TN; (B) concentration and removal rate of NH₄⁺; (C) concentration and removal rate of NO₃⁻; and (D) concentration and removal rate of NO₂⁻.