N2O production in a single stage nitritation/anammox MBBR process

10
8
DO concentration, pH & temperature
35
28
DO (mg/l), pH
6
4
2
21
14
7
Temp °C
DO (mg/l)
pH
Temperature (°C)
0
0
06/07/09
26/07/09
15/08/09
04/09/09
24/09/09
Date
14/10/09
03/11/09
23/11/09
13/12/09
350
Concentrations of influent and effluent total inorganic nitrogen
Total inorganic nitrogen (mg/l)
300
250
200
150
100
50
0
Σ TIN in (mg/l)
Σ TIN out (mg/l)
06/07/09
26/07/09
15/08/09
04/09/09
24/09/09
Date
14/10/09
03/11/09
23/11/09
13/12/09
Removal rate (gN/m²d)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Removal rate (gN/m²d) & % reduction of incomming nitrogen
90
80
70
60
50
40
30
20
10
0
% reduction
Removal rate
(gN/m2d)
% reduction
06/07/09
26/07/09
15/08/09
04/09/09
24/09/09
Date
14/10/09
03/11/09
23/11/09
13/12/09
Figure 13. Reactor operation and process performance during the period 09/07/09-15/12/09.
Top graph illustrates concentration of DO during aeration, pH and temperature. The second graph
shows total concentration of inorganic nitrogen in influent feed and effluent water. The third
shows the removal rate gN/m 2 d and the reduced nitrogen in %.
Figure 14 shows the process performance during different operation modes. Green
series are representing measurements done at intermittent aeration during the period
090918-090927. Blue series are representing measurements at continuous operation,
DO ~1.5 mg/l during the period 091006-091010. Orange series are representing
measurement at continuous operation, DO ~1mg/l during the period 091013-091016.
32