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. 2020 Mar 2;15:7. doi: 10.1186/s40793-020-00354-x

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© The Author(s) 2020

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Biogas and methane yields, and NH₄⁺- and NH₃-contents in the biogas reactor effluents. Bacterial 16S rRNA gene targeting TRFLP analyses results are shown exemplary for different time points at different process conditions. Dotted lines indicate time points of sampling for NGS. ▲,△, hydrolysis reactor (HR) of reactor system M1 (mesophil) resp. T1 (thermophil);▼, ▽, downstream AF of reactor system M1 (mesophil) resp. T1 (thermophil); ■, □, HR of reactor system M2 (mesophil) resp. T2 (thermophil); ◆, ◇, AF of reactor system M2 (mesophil) resp. T2 (thermophil); L_N, liters normalized to 0 °C and 1013 hPa; VS, volatile substances; OLR, organic loading rate