The regulation and control strategies of a sequencing batch reactor for simultaneous nitrification and denitrification at different temperatures

► Prolonged aeration favored the SBR-SND system under low temperatures. ► Further extension of aeration was insubstantial, only increased operational cost. ► C/N ratio adjustment to offset the temperature impacts was ineffective. ► Long SRT lessened low temperature effect but reduced N removal at high temperature. ► ORP, DO, SVI and EPS changed with temperature and led to performance variation.