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《Chinese Journal of Environmental Engineering》 2012-01
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Study on influencing factors of nitrogen removal by a step-feed multi-stage biofilm reactor

Zhou Jian Zhang Xinyu Gan Lisha Han Yi(Key Laboratory of Three Gorges Reservoir Region's Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China)  
According to low carbon-nitrogen ratio of municipal wastewater in small cities and towns,experiments were carried out to investigate the effect of factors such as organic loading,dissolved oxygen(DO) and temperature on performance of denitrification in a step-feed multi-stage biofilm reactor.Major conclusions of the study are as follows: Organic loading,DO and temperature had a significant effect on nitrogen removal.Under the conditions of the temperature of 20~25 ℃,DO of 5 mg/L,organic loading of 1.0 kg COD/(m3·d),biofilm density of 30%,nitrogen loading of 0.22 kg TN/(m3·d),with wastewater fed in the 1st,3rd and 6th stages,and flow distribution ratio of 2∶ 2∶ 1,simultaneous nitrification and denitrification(SND) process was successfully constructed in the reactor,with the effluent concentration of COD,NH+4-N and TN of 33 mg/L,2.6 mg/L and 29.4 mg/L,respectively,and the removal rates of COD,NH+4-N and TN were 90.1%、96.0% and 63.9%,respectively.When the water temperature was below 15 ℃,nitrification rate was affected by the temperature notably.
【Fund】: 国家水体污染控制与治理科技重大专项(2008ZX07315-005)
【CateGory Index】: X703
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