Influence of oxidation-reduction potential and pH on polysulfide concentrations and chain lengths in the biological desulfurization process under haloalkaline conditions.

Biological desulfurization under haloalkaline conditions has been applied worldwide to remove hydrogen sulfide (HS) from sour gas steams. The process relies on sulfide-oxidizing bacteria (SOB) to oxidize HS to elemental sulfur (S), which can then be recovered and reused. Recently, a dual-reactor biological desulfurization system was implemented where an anaerobic (sulfidic) bioreactor was incorporated as an addition to a micro-oxic bioreactor, allowing for higher S selectivity by limiting by-product formation.

Polysulfide Concentration and Chain Length in the Biological Desulfurization Process: Effect of Biomass Concentration and the Sulfide Loading Rate.

Removal of hydrogen sulfide (HS) can be achieved using the sustainable biological desulfurization process, where HS is converted to elemental sulfur using sulfide-oxidizing bacteria (SOB). A dual-bioreactor process was recently developed where an anaerobic (sulfidic) bioreactor was used between the absorber column and micro-oxic bioreactor. In the absorber column and sulfidic bioreactor, polysulfides (S) are formed due to the chemical equilibrium between HS and sulfur (S).