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Table 2

COD, TKN, and TN removals in bioplates-augmented aeration basin

COD removal (%)
TKN removal (%)
TN removal (%)
PRAdditiveInflow COD mg/LOutflow COD mg/LInflow TKN mg/LOutflow TKN mg/LInflow TN mg/LOutflow TN mg/L
3.2% None 74 ± 6.7% 96 ± 2.1% 74 ± 1.3% 
82 ± 9.2 22 ± 7.8 27 ± 0.4 1.1 ± 0.5 28 ± 0.5 7.3 ± 0.3 
Methanol 60 ± 15% 85 ± 11% 76 ± 20% 
180 ± 5.7 75 ± 20.5 29 ± 4.1 4.0 ± 2.5 29 ± 3.9 6.5 ± 4.9 
Methanol and sodium carbonate 75 ± 9.1% 96 ± 3.2% 91 ± 5.0% 
180 ± 0.7 46 ± 17 27 ± 1.1 1.1 ± 0.9 27 ± 1.0 2.5 ± 1.5 
6.5% None 85 ± 6.4% 81 ± 7.2% 59 ± 3.5% 
84 ± 8.2 13 ± 5.8 22 ± 2.0 4.1 ± 1.4 22 ± 2.0 9.2 ± 1.5 
Methanol 92 ± 2.2% 91 ± 2.2% 84 ± 2.8% 
180 ± 2.2 14 ± 3.9 27 ± 4.1 2.3 ± 0.4 28 ± 4.0 4.3 ± 0.4 
Methanol and sodium carbonate 89 ± 1.2% 93 ± 1.4% 86 ± 3.1% 
200 ± 3.6 22 ± 2.6 24 ± 2.4 1.8 ± 0.6 25 ± 2.4 3.4 ± 0.6 
9.1% None 72 ± 3.0% 84 ± 2.7% 57 ± 4.5% 
78 ± 5.1 22 ± 2.5 24 ± 1.9 3.9 ± 0.5 25 ± 1.9 11 ± 0.3 
Methanol 89 ± 2.1% 88 ± 5.0% 81 ± 5.8% 
180 ± 3.0 19 ± 3.2 23 ± 0.7 2.9 ± 1.2 24 ± 0.71 4.7 ± 1.5 
Methanol and sodium carbonate 72 ± 5.1% 92 ± 10% 85 ± 8.3% 
180 ± 3.5 51 ± 8.7 23 ± 0.3 1.8 ± 2.2 23 ± 0.3 3.6 ± 1.9 
11.4% None 80 ± 4.2% 85 ± 0.0% 69 ± 3.5% 
96 ± 1.4 19 ± 4.2 27 ± 0.0 4.0 ± 0.0 27 ± 0.1 8.5 ± 1.0 
Methanol 79 ± 12% 89 ± 0.0% 84 ± 2.5% 
18 ± 11 40 ± 24 28 ± 0.0 3.0 ± 0.0 29 ± 0.1 4.5 ± 0.7 
Methanol and sodium carbonate 79 ± 4.1% 82 ± 8.1% 78 ± 5.7% 
190 ± 13 39 ± 5.0 23 ± 1.6 4.1 ± 1.6 24 ± 1.7 5.2 ± 2.3 
COD removal (%)
TKN removal (%)
TN removal (%)
PRAdditiveInflow COD mg/LOutflow COD mg/LInflow TKN mg/LOutflow TKN mg/LInflow TN mg/LOutflow TN mg/L
3.2% None 74 ± 6.7% 96 ± 2.1% 74 ± 1.3% 
82 ± 9.2 22 ± 7.8 27 ± 0.4 1.1 ± 0.5 28 ± 0.5 7.3 ± 0.3 
Methanol 60 ± 15% 85 ± 11% 76 ± 20% 
180 ± 5.7 75 ± 20.5 29 ± 4.1 4.0 ± 2.5 29 ± 3.9 6.5 ± 4.9 
Methanol and sodium carbonate 75 ± 9.1% 96 ± 3.2% 91 ± 5.0% 
180 ± 0.7 46 ± 17 27 ± 1.1 1.1 ± 0.9 27 ± 1.0 2.5 ± 1.5 
6.5% None 85 ± 6.4% 81 ± 7.2% 59 ± 3.5% 
84 ± 8.2 13 ± 5.8 22 ± 2.0 4.1 ± 1.4 22 ± 2.0 9.2 ± 1.5 
Methanol 92 ± 2.2% 91 ± 2.2% 84 ± 2.8% 
180 ± 2.2 14 ± 3.9 27 ± 4.1 2.3 ± 0.4 28 ± 4.0 4.3 ± 0.4 
Methanol and sodium carbonate 89 ± 1.2% 93 ± 1.4% 86 ± 3.1% 
200 ± 3.6 22 ± 2.6 24 ± 2.4 1.8 ± 0.6 25 ± 2.4 3.4 ± 0.6 
9.1% None 72 ± 3.0% 84 ± 2.7% 57 ± 4.5% 
78 ± 5.1 22 ± 2.5 24 ± 1.9 3.9 ± 0.5 25 ± 1.9 11 ± 0.3 
Methanol 89 ± 2.1% 88 ± 5.0% 81 ± 5.8% 
180 ± 3.0 19 ± 3.2 23 ± 0.7 2.9 ± 1.2 24 ± 0.71 4.7 ± 1.5 
Methanol and sodium carbonate 72 ± 5.1% 92 ± 10% 85 ± 8.3% 
180 ± 3.5 51 ± 8.7 23 ± 0.3 1.8 ± 2.2 23 ± 0.3 3.6 ± 1.9 
11.4% None 80 ± 4.2% 85 ± 0.0% 69 ± 3.5% 
96 ± 1.4 19 ± 4.2 27 ± 0.0 4.0 ± 0.0 27 ± 0.1 8.5 ± 1.0 
Methanol 79 ± 12% 89 ± 0.0% 84 ± 2.5% 
18 ± 11 40 ± 24 28 ± 0.0 3.0 ± 0.0 29 ± 0.1 4.5 ± 0.7 
Methanol and sodium carbonate 79 ± 4.1% 82 ± 8.1% 78 ± 5.7% 
190 ± 13 39 ± 5.0 23 ± 1.6 4.1 ± 1.6 24 ± 1.7 5.2 ± 2.3 

Conditions: MLSS = 1,500–2,500 mg/L, DO = 4–6 mg/L, aeration 1 h on: 1 h off, HRT = 6 h.

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