Performance and mechanisms of nitrogen removal from low-carbon source wastewater in an iron-carbon coupled biofilm airlift internal circulation sequencing batch reactor - Jing Ni; Yongyou Hu; Donghui Liang; Jianhua Cheng; Yuancai Chen; Xiaoqiang Zhu; Guobin Wang; Jieyun Xie (Bioresource Technology, 2025)