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. 2021 May 29;14:125. doi: 10.1186/s13068-021-01968-0

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© The Author(s) 2021

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 4 — Organic components of the media and effluents from bioreactors expressed in millimoles of carbon at the selected time points of Experiment 1 (weeks 102, 103, 105, 106, 107 and 108, corresponding to days 710–751 of bioreactors operation) and Experiment 2 (weeks 115, 116, 117, 118, 119, 121, 122, 123, 124, 126 and 127, corresponding to days 799–886 of bioreactors operation), M1—domination of lactate, M2—domination of butyrate, M3—domination of propionate, M4—domination of acetate. Collection of methanogenic sludge samples for DNA analyses was done on the 751st day for Experiment 1 (108th week of bioreactor operation) and on the 884th day for Experiment 2 (127th week of bioreactor operation)