Comparation on the responses and resilience of single-Anammox system and synergistic partial-denitrification/anammox system to long-term nutrient starvation: Performance and metagenomic insights - Jiantao Ji; Feiyue Hu; Jing Qin; Ying Zhao; Yongen Dong; Haosen Yang; Zhixuan Bai; Guanqi Wu; Qiyue Wang; Baodan Jin (Bioresource Technology, 2025)