Concentration-dependent roles of hydrazine in immobilized denitrifying biofilm for industrial wastewater treatment - Chenxi Li; Yunfeng Tan; Shengqiang Ma; Jing Wang; Wenlong Bai; Zhi Li; Shengbin Gao; Quanlin Zhao; Jiangzhou Qin; Zhengfang Ye (Bioresource Technology, 2026)