Kinetics of an upflow anaerobic sludge blanket reactor treating ice‐cream wastewater

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Abstract
A laboratory study was devised to verify the use of Monod kinetics for the modelling of continuous upflow anaerobic sludge blanket (UASB) reactors treating ice‐cream wastewater. Eight different hydraulic retention times (5.0–0.4 day) were investigated at an average influent COD concentration of 5.2 g.1‐1). The maximum substrate utilization rate, k, and half saturation coefficient, KL, were determined to be 1.39 kg CODremoved.kg‐1 VSS.day‐1 and 0.29 kg COD.kg‐1 VSS.day‐1. The yield coefficient, Y, and sludge decay rate coefficient, Kd, were also determined to be 0.16 kg VSS.kg‐1 CODremoved and 0.028 day‐1, respectively. The close relationship between biomass loading rate and specific substrate utilization rate supported the use of Monod equations and allowed the model to be used predictively for assessing plant performance.