Effect of sinusoidal perturbations of feed concentration on multi-substrate carbon oxidation and nitrification process in an upflow packed-bed biofilm reactor

摘要

The performance of an upflow packed bed biofilm reactor has been analyzed under multi-substrate limitation by considering simultaneous carbon oxidation and nitrification reactions. For an inlet concentration of 200 mg l~1 of NH+_4-N and 50mg l~1 of methanol, the results show that organic substrate is consumed very rapidly near the inlet of the reactor while most of the NH+_4-N is converted in the central region of the reactor. When the inlet concentration of methanol is subjected to sinusoidal variation, the exit concentration of NH+_4-N also follows a sinusoidal pattern although its inlet concentration was subjected to step input.