Dosing with pyrite significantly increases anammox performance: Its role in the electron transfer enhancement and the functions of the Fe-N-S cycle

Fan Feng, Zhigong Liu, Xi Tang, Xing Wu, Caiyan Qu, Seow Wah How, Di Wu, Ruiyang Xiao, Chong-Jian Tang, Zhang Lin, Liyuan Chai, Guanghao Chen