High-rate hydrogenotrophic denitrification in a pressurized reactor

The feasibility of the proposed reactor was shown for two effluent concentrations of 10 and 1 mg NO3−-N/L. Average denitrification rates of 2.1 ± 0.2 and 1.06 ± 0.06 g NO3−-N/(Lreactor d) with H2 utilization efficiencies of 92.8% and 96.9% were measured for the two effluent concentrations, respectively. Higher denitrification rates of up to 5 g NO3−-N/(Lreactor d) were observed at higher recirculation flow rates and higher partial pressures of H2.