Unveiling novel steady-state phosphorus removal equilibrium in partial nitritation/Anammox-hydroxyapatite process: underlying mechanisms and microbial metabolism - Yangkai Liu; Yanxiao Wei; Zhenpeng Cao; Chengcheng Lin; Jing Chen; Jingyi Jiang; Jiao Jin; Shengbo Gu; Mohd Fadhil Md Din; Sanjaya Eli Hendrik; Zhihua Liu; Hong Chen (Bioresource Technology, 2025)