Dual functions of pyrite modified polyethylene carrier in Anammox biofilm: Promoting biofilm growth and enhancing nitrogen removal - Tingting Liu; Dongyue Li; Peng Gao; Yuhan Zhu; Linzhu Du; Xingrong Yao; Wanqi Liu; Kailun Yang; Xingxing Xiong; Ning An; Jiarui Li; Qian Zhao; et al. (Chemical Engineering Journal, 2026)