Start up of simultaneous partial nitrification, anammox, and denitrifying phosphorus removal in a sequencing dual-biofilm batch reactor: optimization and microbial community dynamics - Tianqi Zhang; Yanxue Duan; Hui Jin; Jie Wang; Chengchao Xin; Xiaoling Zhang; Aixia Chen; Wenjuan Yang (Journal of Water Process Engineering, 2025)