Heterotrophic nitrification-aerobic denitrification strains: An overlooked microbial interaction nexus in the anaerobic-swing-anoxic-oxic (ASAO) plug-flow system - Run-Ze Xu; Jia-Shun Cao; Song Cheng; Jing-Yang Luo; Bing-Jie Ni; Fang Fang; Weijing Liu; Peifang Wang (Journal of Environmental Management, 2025)