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oai:uvadoc.uva.es:10324/269072025-03-26T19:10:03Zcom_10324_1173com_10324_931com_10324_894com_10324_31059com_10324_954col_10324_1371col_10324_31061

Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes Posadas Olmos, Esther Szpak, D. Lombó, F. Domínguez, A. Díaz Villalobos, Israel Blanco, Saúl García Encina, Pedro Antonio Muñoz Torre, Raúl Producción Científica The present research was conducted to simultaneously optimize biogas upgrading and carbon and nutrient removal from centrates in a 180-L high-rate algal pond interconnected to an external CO2 absorption unit. Different biogas and centrate supply strategies were assessed to increase biomass lipid content. Results showed 99 % CO2 removal efficiencies from simulated biogas at liquid recirculation rates in the absorption column of 9.9 m3 m−2 h−1, concomitant with nitrogen and phosphorus removal efficiencies of 100 and 82 %, respectively, using a 1:70 diluted centrate at a hydraulic retention time of 7 days. The lipid content of the harvested algal–bacterial biomass remained low (2.9–11.2 %) regardless of the operational conditions, with no particular trend over time. The good settling characteristics of the algal–bacterial flocs resulted in harvesting efficiencies over 95 %, which represents a cost-effective alternative for algal biomass reutilization compared to conventional physical–chemical techniques. Finally, high microalgae biodiversity was found regardless of the operational conditions. 2017-11-06T13:37:08Z 2017-11-06T13:37:08Z 2016 info:eu-repo/semantics/article Journal of Applied Phycology, 2016, Volume 28, Issue 4, pag. 2147–2157 http://uvadoc.uva.es/handle/10324/26907 10.1007/s10811-015-0758-3 eng https://rd.springer.com/article/10.1007/s10811-015-0758-3 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 International Springer SI