Removal characteristics and functional bacterial community analysis of novel two-stage integrated biological reactor and two-stage anoxic–oxic systems feeding with livestock farming wastewater - Zhenxing Zhong; Wenzhe Liu; Yanxu Zhu; Jingjing Liu; Chunjie Zhang; Rui Wang; Nanshan Yang; Xuejun Long; Peng Yu; Feixiang Zan; Xiejuan Lu; Xiaohui Wu; et al. (Journal of Water Process Engineering, 2026)