Biogenic H2so4 corrosion of concrete in oxygen activated sludge bioreactors

Significant concrete corrosion has occurred within the head space of a pure oxygen activated sludge treatment (OAS) bioreactor treating pulp and paper mill effluent. Bioreactor input effluent solutions were characterized and compared to identify the process conditions most likely responsible for the biogenic H2SO4 corrosion and the damage mechanism. The results suggest that dissolved hydrogen sulfide (H2S), total reduced sulfur (TRS), or both, …