Problem 112

The same wastewater described in Problem 11.1 is to be nitrified. The NH 4-N concentration of Snh4-n,o = 50 mg L 1 must be reduced down to 1 mg L-1. Oxygen utilization in the airflow is about 20%, c02,0 = 0.232 kg m-3 O2, V = 5000 m3. We will assume that the nitrifiyers are not washed out.

1. Calculate the oxygen uptake rate and the required air flow rate.

2. Calculate the needed specific mass transfer coefficients with (c ' = 2 mg L-1) and without nitrification (c ' = 1 mg L-1).

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