HS oxidation coupled to nitrate reduction in a two-stage bioreactor: Targeting HS-rich biogas desulfurization.

A two-stage bioreactor operated under anoxic denitrifying conditions was evaluated for desulfurization of synthetic biogas laden with HS concentrations between 2500 and 10,000 ppm. HS removal efficiencies higher than 95% were achieved for HS loads ranging from 16.2 to 51.