Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process

• Published in: 环境科学学报（英文版） Vol. 19; no. 9; pp. 1043 - 1048
• Main Authors: ZHU Gui-bing, PENG Yong-zhen, WU Shu-yun, WANG Shu-ying, XU Shi-wei
• Format: Journal Article
• Language: English
• Published: Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China%School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China 2007; Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology,Beijing 100022,China%School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China%Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology,Beijing 100022,China%Beijing Drainage Group Co.Ltd.,Beijing 100038,China; School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China
• Subjects: dissolved oxygen; biological nitrogen removal; step feeding process; simultaneous nitrification and denitrification; floe size
• ISSN: 1001-0742; 1878-7320
• DOI: 10.3321/j.issn:1001-0742.2007.09.005

X7; The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under different influent substrate concentrations and aeration flow rates.Biological occurrence of simultaneous nitrification and denitrifieation 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 floe sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.