Abstract: The influence of the liquid-to-biogas ratio (L/G) and alkalinity on methane quality was evaluated in a 11.7?m3 outdoors horizontal semi-closed tubular photobioreactor interconnected to a 45-L absorption column (AC). CO2 concentrations in the upgraded methane ranged from <0.1 to 9.6% at L/G of 2.0 and 0.5, respectively, with maximum CH4 concentrations of 89.7% at a L/G of 1.0. Moreover, an enhanced CO2 removal (mediating a decrease in CO2 concentration from 9.6 to 1.2%) and therefore higher CH4 contents (increasing from 88.0 to 93.2%) were observed when increasing the alkalinity of the AC cultivation broth from 42?±?1?mg?L?1 to 996?±?42?mg?L?1. H2S was completely removed regardless of the L/G or the alkalinity in AC. The continuous operation of the photobioreactor with optimized operating parameters resulted in contents of CO2 (<0.1%?1.4%), H2S (<0.7?mg?m?3) and CH4 (94.1%?98.8%) complying with international regulations for methane injection into natural gas grids.

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