The suitable upflow velocity of 23.9 m/h was conducive to excellent mixing of sludge and substrates,
resultingin high COD removal efficiency, but excessive upflow velocity would cause the granular sludge disintegration and a decline in COD removal rate. Application of the modified Stover–Kincannon model for kinetic analysis of the MIC reactor treating dyeing wastewater revealed a maximum removal rate constant (Umax) and saturation
value constant (KB) of 31.25 g/L d and 34.94 g/L d, respectively