Corrigendum to "Mechanisms of nitrite addition for simultaneous sludge fermentation/nitrite removal (SFNR)" [Water Res 64 (2014) 13–22]. (15th May 2020) - Wu, Chengcheng; Peng, Yongzhen; Wang, Shuying; Li, Baikun; Zhang, Liang; Cao, Shenbin; Du, Rui