Nitrogen removal performance and microbial communities during wastewater treatment through anammox: Effect of HRT and COD content - Yunhui Pu; Yao Xiong; Yan Liu; Yang Luo; Ruoran Liu; Jingyun Chen; Dan Xu; Jialing Tang; Shah Faisal; Abdelfatah Abomohra; Qingyuan Wang (Journal of Water Process Engineering, 2026)