Department of Environmental Engineering,Dalian Nationalities University,Dalian 116600,China;
School of Environmental and Biological Science and Technology,Dalian University of Technology,Dalian 116023,China;
School of Environmental and Biological Science and Technology,Dalian University of Technology,Dalian 116023,China;
aerobic granular sludge; simultaneous nitrification and denitrification; facultative aerobe;