Table 2 The effects of influent C/N ratio on N2O production and nitrogen conversion in the A/O/A SBBR system.

From: Effects of influent COD/N ratios on nitrous oxide emission in a sequencing biofilm batch reactor for simultaneous nitrogen and phosphorus removal

 

C/Na = 1

C/N = 2

C/N = 3

C/N = 4

N2O in anaerobic period (mg/L)

0.95 ± 0.05

0.10 ± 0.00

0.61 ± 0.03

0.03 ± 0.01

N2O in aerobic period (mg/L)

6.61 ± 1.10

10.65 ± 1.34

5.46 ± 0.85

2.66 ± 0.05

N2O in anoxic period (mg/L)

5.43 ± 0.85

5.96 ± 0.65

7.42 ± 1.10

0.92 ± 0.02

Total N2O production (mg/L)

12.99 ± 2.20

16.71 ± 1.85

13.49 ± 2.03

3.61 ± 0.15

N2O conversion rateb

30.55 ± 2.04

34.13 ± 1.00

28.05 ± 1.85

7.28 ± 1.04

  1. aC/N = COD/influent total nitrogen; bN2O-N conversion rate = (total N2O-N production)/(total nitrogen removed) × 100%.
Back to article page