[N2O emission and control in shortcut nitrification and denitrification and simultaneous nitrification and denitrification biological nitrogen removal systems].
SBR reactors were used to investigate the N2O emission in shortcut nitrification and simultaneous nitrification and denitrification (SND). Shortcut nitrification with nitrosation rate above 90% was realized by real-time control strategy. The N2O emission and variation of nitrosation rate were investigated under 4 DO levels (0.5, 1.0, 1.5, 2.0 mg/L). The results turned out that the optimal DO to maintain high nitrosation rate and minimum N2O emission was 1.5 mg/L and the N4O emission was 0.06 g per ammonium removed. The SBR filled with carbon fiber performed under low DO and pulse feeding. The SND rate was over 79% during the experiment. The N2O emission was studied under DO 0.2, 0.4, 1.0 and 1.5 mg/L. It turned out that the optimal DO was 1.0 mg/L and the N2O emission was 0.021 g per ammonium removed. Compared to the shortcut nitrification, the N2O emission of SND was 1/3 of the short-cut nitrification under optimal DO.
Zhang
Jing-rong
JR
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. jingrongzhang07@yahoo.com.cn
Wang
Shu-ying
SY
Shang
Hui-lai
HL
Peng
Yong-zhen
YZ
D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*
D009609:Nitrous Oxide; D009584:Nitrogen