Effect of C/N Ratio to Nitrogen Removal Efficiency and Nitrous Oxide Emission during Denitrification Coupled with Catalytic Iron

The denitrification efficiency and nitrous oxide production during conventional biological denitrification and denitrification coupling with catalytic iron under different C/N ratio was studied.The results show that in both groups,the total nitrogen removal efficiency decreases while nitrous oxide production increases when C/N ratio becomes lower.But comparing control group,catalytic iron group has higher nitrate transforming efficiency and nitrous oxide emission.Futher more,the nitrous oxide could even be totally degraded when C/N was 1.