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oai:uvadoc.uva.es:10324/269082025-02-20T07:10:43Zcom_10324_1173com_10324_931com_10324_894com_10324_31059com_10324_954col_10324_1371col_10324_31061

Influence of biogas flow rate on biomass composition during the optimization of biogas upgrading in microalgal-bacterial processes Serejo, Mayara L. Muñoz Torre, Raúl Posadas Olmos, Esther Boncz, Marc A. Blanco, Saúl García Encina, Pedro Antonio Producción Científica The influence of biogas flow rate (0, 0.3, 0.6, and 1.2 m3 m–2 h–1) on the elemental and macromolecular composition of the algal-bacterial biomass produced from biogas upgrading in a 180 L photobioreactor interconnected to a 2.5 L external bubbled absorption column was investigated using diluted anaerobically digested vinasse as cultivation medium. The influence of the external liquid recirculation/biogas ratio (0.5 < L/G < 67) on the removal of CO2 and H2S, and on the concentrations of O2 and N2 in the upgraded biogas, was also evaluated. A L/G ratio of 10 was considered optimum to support CO2 and H2S removals of 80% and 100%, respectively, at all biogas flow rates tested. Biomass productivity increased at increasing biogas flow rate, with a maximum of 12 ± 1 g m–2 d–1 at 1.2 m3 m–2 h–1, while the C, N, and P biomass content remained constant at 49 ± 2%, 9 ± 0%, and 1 ± 0%, respectively, over the 175 days of experimentation. The high carbohydrate contents (60–76%), inversely correlated to biogas flow rates, would allow the production of ≈100 L of ethanol per 1000 m3 of biogas upgraded under a biorefinery process approach. 2017-11-06T13:47:28Z 2017-11-06T13:47:28Z 2015 info:eu-repo/semantics/article Environmental Science & Technology, 2015, 49(5), pag. 3228-3236 http://uvadoc.uva.es/handle/10324/26908 10.1021/es5056116 eng http://pubs.acs.org/doi/10.1021/es5056116 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 International American Chemical Society SI