Aquatic environment

Simultaneous nitrification and denitrification in step feeding biologicalnitrogen removal process

ZHU Gui-bing , PENG Yong-zhen , WU Shu-yun , WANG Shu-ying , XU Shi-wei


Received October 09, 2006,Revised April 04, 2007, Accepted , Available online

Volume 19,2007,Pages 1043-1048

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The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under di erent influent substrate concentrations and aeration flow rates. Biological occurrence of simultaneous nitrification and denitrification was verified in the aspect of nitrogen mass balance and alkalinity. The experimental results also showed that there was a distinct linear relationship between simultaneous nitrification and denitrification and DO concentration under the conditions of low and high aeration flow rate. In each experimental run the floc sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.

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