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Effects of Aeration on Nitrification Process in a Polluted Urban River 被引量:1
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作者 LING Fen WANG Guo-xiang +3 位作者 LIU Bo xu Kuan ZHOU Feng DU Xu 《Meteorological and Environmental Research》 2012年第6期26-29,共4页
[Objective] The study aimed to discuss the effects of aeration on nitrification process in a polluted urban river, [Metbod] Through indoor simulation experiments, the effects of different aeration conditions (aeratin... [Objective] The study aimed to discuss the effects of aeration on nitrification process in a polluted urban river, [Metbod] Through indoor simulation experiments, the effects of different aeration conditions (aerating water named Ew, aerating sediment named Es ) on nitrification process in a polluted urban river were studied.[ Result]The nitrification of the control group named Ec proceeded slowly, while two kinds of aeration promo- ted the process of nitrification, that is, the peak values of nitrate nitrogen of Ew and Es group were respectively 5.15 and 3.83 times that of Ec group. During aeration, NO2 --N accumulation in the overlying water of Ew and Es group lasted for 10 and 14 days separately, and the maximum concentrations reached 11.41 and 7.41 mg/L respectively. Nitrification process was not consistent during the two aeration conditions, that is, the rate of nitrite oxidation in Ew group was faster than that in Es group. Denitrification process was significant after aeration, and the concentration of nitrate nitrogen in Ew and Es group was 1.26 and 2.82 mg/L respectively at the end of the experiment. [ Conclusion]The research could provide scientific references for the restoration of polluted urban rivers. 展开更多
关键词 Aeration conditions Nitrification process Nitrate nitrogen nitrite nitrogen accumulation Polluted urban river China
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Aerobic N_2O emission for activated sludge acclimated under different aeration rates in the multiple anoxic and aerobic process 被引量:2
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作者 Huoqing Wang Yuntao Guan +1 位作者 Min Pan Guangxue Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第5期70-79,共10页
Nitrous oxide(N_2O) is a potent greenhouse gas that can be emitted during biological nitrogen removal. N_2O emission was examined in a multiple anoxic and aerobic process at the aeration rates of 600 m L/min sequenc... Nitrous oxide(N_2O) is a potent greenhouse gas that can be emitted during biological nitrogen removal. N_2O emission was examined in a multiple anoxic and aerobic process at the aeration rates of 600 m L/min sequencing batch reactor(SBRL) and 1200 m L/min(SBRH).The nitrogen removal percentage was 89% in SBRLand 71% in SBRH, respectively. N_2O emission mainly occurred during the aerobic phase, and the N_2O emission factor was 10.1%in SBRLand 2.3% in SBRH, respectively. In all batch experiments, the N_2O emission potential was high in SBRLcompared with SBRH. In SBRL, with increasing aeration rates, the N_2O emission factor decreased during nitrification, while it increased during denitrification and simultaneous nitrification and denitrification(SND). By contrast, in SBRHthe N_2O emission factor during nitrification, denitrification and SND was relatively low and changed little with increasing aeration rates. The microbial competition affected the N_2O emission during biological nitrogen removal. 展开更多
关键词 Aeration rate Nitrous oxide Biological nitrogen removal Multiple anoxic and aerobic nitrite accumulation
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