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. 2015 Dec 17;15:277. doi: 10.1186/s12866-015-0615-1

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© Nolla-Ardèvol et al. 2015

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. 1 — Biogas, methane production and sludge characteristics. Left axis: daily biogas (Black-●) and methane (Gray-■) production normalized to standard temperature and pressure conditions (20 °C; 0 atm); Right axis: Soluble COD (Blue- ∆); acetic acid (Purple- ◊); propionic acid (Red-o), NH₃-N (Orange-■) obtained from the anaerobic digestion of Spirulina. Vertical dashed line indicates a change in the organic loading rate from 4.0 g Spirulina L⁻¹ day⁻¹ to 5.0 g Spirulina L⁻¹ day⁻¹