Table 1 Effects of C/N ratio on N2O generation and the removals of TN and P from synthetic wastewater treated by the A/O/A SBBR process.

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 conversion rateb (%)

30.55 ± 2.04

34.13 ± 1.00

28.05 ± 1.85

7.28 ± 1.04

TN removal efficiency (%)

82.46 ± 1.65

91.75 ± 5.60

97.49 ± 2.67

98.30 ± 2.53

P removal efficiency (%)

6.35 ± 8.22

9.07 ± 7.20

82.79 ± 1.87

27.44 ± 6.21

Average NARc (%)

58.56

73.90

86.19

73.43

Average ESND d (%)

27.61

40.62

53.15

78.61

Average Ammonia oxidation rate (mg/L.min)

0.13

0.13

0.11

0.11

  1. aC/N = COD/influent total nitrogen; bN2O-N conversion rate = (total N2O-N production)/(total nitrogen removed) × 100%; cNAR: nitrite accumulation ratio; dESND: the efficiency of simultaneous nitrification and denitrification.
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