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. 2018 Oct 27;6:194. doi: 10.1186/s40168-018-0583-4

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© The Author(s). 2018

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 — CH₄ yield of the two configurations (a), pH and VFAs trends in R1 (b), R2 (c) and R3 (d), before (phase I) and after (phase II) H₂ injection. The orange and green arrows highlight the DNA/RNA sampling points for the single and the two-stage configuration, respectively