Bacteria Determine the Measured Oxidation Reduction Potential in the Biological Gas Desulfurization Process

In the biotechnological gas desulfurization process, dissolved sulfide is oxidized into predominantly elemental sulfur (S8) by oxidizing bacteria (SOB) under strict oxygen limited conditions. An online measurement of oxidation reduction potential (ORP) used to control O2 supply bioreactor maximize selectivity for S8 formation and minimize unwanted sulfate formation. While ORP in considered be a measure mainly concentrations, practice, none these components are detectable. this study, we investigated sensitivity stored charge SOB toward ORP. Stored was measured an electrochemical cell. These were harvested from pilot-scale installation. The bioreactor, which not detectable, operated at different setpoints (−250 −390 mV vs Ag/AgCl). It found that more recovered when aerated lower. measurements calibrate model describe based on storage SOB, showed increases decreases contain charge. This can further optimize process.