Autotrophic sulfide removal by mixed culture purple phototrophic bacteria

Photoautotrophic removal of hydrogen sulfide from biogas using purple and green sulfur bacteria

“…(GSB) were investigated with high H 2 S removal efficiency above 90 % (Basu et al, 1996;Kim and Chang, 1991;Lee and Kim, 1998). In the case of PSB, similar results were obtained by Borkenstein and Fischer (2006) in a photobioreactor inoculated with the mutant A. vinosum strain 21D (PSB) and using batch mode with mixed culture dominated by Chromatiaceae (Egger et al, 2020). Unfortunately, the number of studies assessing the influence of environmental and operational parameters on the biogas desulfurization performance of PSB and GSB is limited.…”

“…Similarly, Kim et al (1992) reported light inhibition above 40 klx in GSB Chlorobaculum thiosulfatiphilum (previously Chlorobium thiosulfatophilum) while Takashima et al (2000) observed gradual inhibition from 5 to 16 klx in Prosthecochloris aestuarii (GSB). On the other hand, increasing light intensity up to inhibitory value may by beneficial as it increases the cell growth (Sun et al, 2022;Ross and Pott, 2022) and H 2 S removal (Egger et al, 2020).…”

Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors

“…As PPB are not able to reduce sulphates, two other bacterial clades capable of doing so (i.e., HSRB and ASRB) were added, based on Durán et al (2020). Known intermediate S species such as thiosulphate or elemental sulphur have been omitted for simplicity (Egger et al, 2020). The fermentative capabilities of PPB were also included.…”

“…The work of Durán et al (2020) was used as base to represent non-PPB S-related processes. Different studies were used for PPB-related processes (Capson-Tojo et al, 2022, 2021Egger et al, 2020;Puyol et al, 2020Puyol et al, , 2017. Predation was modelled according to Ni et al (2011) and Moussa et al (2005), and microalgae growth according to Wágner et al (2016).…”

Removal of H₂S and CO₂ from biogas by algae-assisted bioelectrochemical system with oxygenic and anoxygenic photosynthesis

“…Unlike oxygenic photosynthesis, anoxygenic photosynthesis is much more suitable for the removal of H 2 S from biogas because it takes place in one step and the risk of oxygen contamination in the gas phase is eliminated. Anaerobic H 2 S removal processes use green sulfur bacteria (GSB) [2,7] and/or a mixed culture of purple phototrophic bacteria (PPB) consisting mainly of purple sulfur bacteria (PSB) [8], which can oxidize sulfide to sulfate [9]. PPBs possess a photoautotrophic metabolism, using sulfides as an electron donor for inorganic carbon reduction and also for their growth and development [10].…”