Two distinct patterns for advanced simultaneous nitrogen and phosphorus removal treating low C/N wastewater in a low DO anaerobic/oxic/anoxic-aerobic granular sludge (AOA-AGS) system - Jingwei Ma; Ying Han; Yaning Ji; Hui Sun; Peng Bi; Long Chen; Xinrui Zhang; Xinru Li; Shiquan Ren; Liang Zhu; Qiulai He (Environmental Research, 2026)