Key Laboratory of Northwest Water Resource,Environment and Ecology,MOE,Xi’an University of Architecture and Technology,Xi’an 710055,China;
Shaanxi Key Laboratory of Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;
Shanghai Environmental&Sanitary Engineering Design Institute Co.Ltd.,Shanghai 200232,China;
Denitrification; Respirogram; Activated sludge; Oxygen uptake rate; Biological nutrient removal;