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. 2023 Jun 16;195(7):849. doi: 10.1007/s10661-023-11358-8

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Top: total nitrogen (TN) load per day at the inlet of the bioreactors relative to hydraulic load per day. Middle: TN removal (total removal per day) relative to hydraulic load per day. Bottom: TN removal (percent removal per day) relative to hydraulic load per day. The relationships between the variables were assessed using linear regressions before and after transformation of the hydraulic load using natural logarithms. Legends GA, GB, and GC are Gyldenholm A, B, and C, respectively. HA, HB, and HC are Hofmansgave A, B, and C, respectively. Se is Serupgård. Eg is Egsmarken. Du is Dundelum