Nitrogen removal influence factors in A/O process and decision trees for nitrification/denitrification system

Article type: Research Article

Authors: MA, Yong | PENG, Yong-zhen^; | WANG, Shu-ying | WANG, Xiao-lian

Affiliations: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | Department of Environmental Engineering, Beijing University of Technology, Beijing 100022, China

Note: [] E-mail: [email protected]

Note: [] Corresponding author. E-mail: [email protected]

Abstract: In order to improve nitrogen removal in anoxic/oxic (A/O) process effectively for treating domestic wastewaters, the influence factors, DO (dissolved oxygen), nitrate recirculation, sludge recycle, SRT (solids residence time), influent COD/TN and HRT(hydraulic retention time) were studied. Results indicated that it was possible to increase nitrogen removal by using corresponding control strategies, such as, adjusting the DO set point according to effluent ammonia concentration; manipulating nitrate recirculation flow according to nitrate concentration at the end of anoxic zone. Based on the experiments results, a knowledge-based approach for supervision of the nitrogen removal problems was considered, and decision trees for diagnosing nitrification and denitrification problems were built and successfully applied to A/O process.

Keywords: A/O process, nitrification, denitrification, nitrogen removal, decision trees

Journal: Journal of Environmental Sciences, vol. 16, no. 6, pp. 901-907, 2004