Technology validation of photosynthetic biogas upgrading in a semi-industrial scale algal-bacterial photobioreactor
Rodero, María del Rosario | Lebrero, Raquel | Serrano, Esteban | Lara, Enrique | Arbib, Zouhayr | García-Encina, Pedro A. | Muñoz, Raúl
The performance of photosynthetic biogas upgrading coupled to wastewater treatment was evaluated in an outdoors high rate algal pond (HRAP) interconnected to an absorption column at semi-industrial scale. The influence of biogas flowrate (274, 370 and 459 L h⁻¹), liquid to biogas ratio (L/G = 1.2, 2.1 and 3.5), type of wastewater (domestic versus centrate) and hydraulic retention time in the HRAP (HRT) on the quality of the biomethane produced was assessed. The highest CO₂ and H₂S removal efficiencies (REs) were recorded at the largest L/G due to the higher biogas-liquid mass transfer at increasing liquid flowrates. No significant influence of the biogas flowrate on process performance was observed, while the type of wastewater was identified as a key operational parameter. CO₂ and H₂S-REs of 99% and 100% at a L/Gₘₐₓ = 3.5 were recorded using centrate. The maximum CH₄ content in the biomethane (90%) was limited by N₂ and O₂ desorption.
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