RT info:eu-repo/semantics/article T1 Seasonal variation of biogas upgrading coupled with digestate treatment in an outdoors pilot scale algal-bacterial photobioreactor A1 Marín, David A1 Posadas Olmos, Esther A1 Cano, Patricia A1 Pérez Martínez, Víctor A1 Blanco, Saúl A1 Lebrero Fernández, Raquel A1 Muñoz Torre, Raúl K1 Fotobiorreactor de algas y bacterias K1 Biogás K1 Algal-bacterial photobioreactor AB The yearly variations of the quality of the upgraded biogas and the efficiency of digestate treatment were evaluated in an outdoors pilot scale high rate algal pond (HRAP) interconnected to an external absorption column (AC) via a conical settler. CO2 concentrations in the upgraded biogas ranged from 0.7% in August to 11.9% in December, while a complete H2S removal was achieved regardless of the operational month. CH4 concentrations ranged from 85.2% in December to 97.9% in June, with a limited O2 and N2 stripping in the upgraded biogas mediated by the low recycling liquid/biogas ratio in the AC. Biomass productivity ranged from 0.0 g m−2 d−1 in winter to 22.5 g m−2 d−1 in summer. Finally, microalgae diversity was severely reduced throughout the year likely due to the increasing salinity in the cultivation broth of the HRAP induced by process operation in the absence of effluent. PB Elsevier SN 0960-8524 YR 2018 FD 2018 LK http://uvadoc.uva.es/handle/10324/30050 UL http://uvadoc.uva.es/handle/10324/30050 LA eng NO Bioresource Technology, Volume 263, 2018, Pages 58-66 NO Producción Científica DS UVaDOC RD 12-nov-2024