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Abstract
The kinetic characteristics of biological simultaneous anaerobic sulfide and nitrite removal were studied in UASB reactor. The results showed that the process was capable of tolerating high influent sulfide and nitrite concentrations of 880 mg S/L and 252.78 mg N/L, respectively. It could hold a high sulfide and nitrite removal loading rates of 13.45 kg S/m3/d and 2.26 kg N/m3/d, respectively. Half-order model, first-order model, and second-order model were applied to predict the performance of the process, which indicated that second-order substrate removal model was best to predict the substrate removal in the bioreactor. Monod model, Michaelis–Menten model and Stover–Kincannon model were used to calculate the kinetic constants, which showed that modified Stover–Kincannon model and modified Michaelis–Menten model were ideal for determining maximum sulfide and nitrite removal rates, respectively.