Abstract
Hydrogen sulphide (H2S) is a toxic and corrosive gas. Its removal from biogas is important to obtain valuable biomethane. A novel photobioreactor (PBR) has been conceived where the bacterium Chlorobium limicola converts H2S in elemental sulphur through an anoxigenic photosynthetic process. This system has proven to be stable over time. Quantitative clean-up was achieved in tests with artificial biogas with high concentration of H2S. Molecular analysis was used to check the stability of the culture under non-sterile conditions. This analysis has shown the presence of a strain belonging to Epsilonproteobacteria that does not affect the efficiency of the process. An aliquot of this bacterial culture was sampled and used as inoculum in a second experiment where the PBR was installed downstream of an anaerobic digestion plant. The efficiency of H2S removal was around 90% and the bacterial consortium remained stable. [Received: January 14, 2016; Accepted: April 24, 2016]
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