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《Journal of Dalian University of Technology》 2009-02
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Nitrogen removal in an airlift combined A/O biofilm reactor

GUO Hai-yan1,2,ZHOU Ji-ti*1,ZHANG Xiu-hong1(1.School of Environmental and Biological Science and Technology,Dalian University of Technology,Dalian 116024,China;2.College of Environmental and Chemical Engineering,Dalian Jiaotong University,Dalian 116028,China)  
A novel airlift combined A/O biofilm reactor used for wastewater nitrogen removal was developed and the influence of influent ratio of carbon to nitrogen and aeration rate on nitrification and denitrification was studied.The experimental results demonstrate that nitrification efficiency drops with the increase of influent ratio of carbon to nitrogen.Increasing the aeration rate can improve the DO concentration in the aerobic and buffering zone and decrease the impact of organic carbon oxidization on nitrification.Organic carbon source can effectively be utilized as the electron donor of denitrification action in anaerobic zone under the conditon of low influent ratio of carbon to nitrogen.About 96.0% of COD and 80.0% of nitrogen removal are achieved when the influent nitrogen loading is 0.01 kg/(m3·d),organic carbon loading is 0.26~0.76 kg/(m3·d) and influent ratio of carbon to nitrogen is 2.7~5.3.
【CateGory Index】: X703
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