The mixotrophic simultaneous desulfurization-denitrification technique and influence factors

An anaerobic attached-growth reactor with mixotrophic desulfurization-denitrification technique, was applied to treat simulating wastewater containing sulfide and organic matter, using nitrate and nitrite as electron acceptors. When the concentrations of inflow sulfide and organic carbon were 200 mg/L and 20 mg/L respectively, the removal efficiencies could reach 99.9% and 80.5% respectively. Meanwhile, the removal efficiencies of introduced nitrate and nitrite were 83.0% and 94.5% respectively. The loadings of glucose and acetate sodium, beneficial to mixotrophic desulfurization-denitrification, were 50 mg/(L·d) and 25 mg/(L·d) respectively. The inhibition action of glucose on autotrophic denitrification was smaller than that of acetate sodium on autotrophic denitrification under mixotrophic state.