N2O production in a single stage nitritation/anammox MBBR process

Aeration 1.6 (l/min) with carriers
N₂O (µmo/l)
14
12
10
8
6
4
2
0
0 5 10 15 20 25
Time (min)
N2O (µmol/l)
y = -0.6482x + 10.193
y = 12.95e -0.143x
Figure 25. Stripping of N 2O from the water phase during aeration with an aeration rate of 1.6
l/min.
When the aeration rate was further increased to 2.0 l/min the linear stripping rate
increased to ~0.67 µM/min, see Figure 26.
14
Aeration 2.0 (l/min) with carriers
N₂O (µmo/l)
12
10
8
6
4
2
0
0 5 10 15 20 25
Time (min)
N2O (µmol/l)
y = -0.6722x + 10.714
y = 13.571e -0.141x
Figure 26.Stripping of N 2O from the water phase during aeration with an aeration rate of 2.0 l/min.
With a starting concentration of ~12 µmol/l, it took between 15 and 20 minutes to strip
N2O out of the water phase to a concentration ~1µmol/l.
43