Table 1 Characteristic of Brewery AD effluent. The value indicates means ± SD (n = 3)
Parameter | Unit | Month of different Seasons | Discharge limit (EEPA 2003) | |||
|---|---|---|---|---|---|---|
December | March | June | October | |||
pH | – | 7.7 ± 0.04 | 7.45 ± 0.03 | 7.25 ± 0.01 | 7.50 ± 0.04 | – |
COD | mg L−1 | 370.3 ± 6.11 | 439.3 ± 6.11 | 389 ± 3.6 | 399.7 ± 5.68 | 250 |
NH4+-N | mg L−1 | 41.3 ± 1.52 | 45.7 ± 1.61 | 35.0 ± 0.91 | 44.1 ± 1.5 | 20 |
TN | mg L−1 | 56.7 ± 0.58 | 57.7 ± 0.58 | 44.3 ± 1.00 | 57.0 ± 1.00 | 40 |
PO4 3−-P | mg L−1 | 38.1 ± 0.39 | 41.38 ± 1.41 | 35.3 ± 1.03 | 36.5 ± 1.5 | – |
TP | mg L−1 | 49.36 ± 0.46 | 53.5 ± 1.95 | 49.9 ± 0.97 | 47.2 ± 1.64 | 5 |
N/P ratio | Â | 1:1.45 | 1:1.08 | 1:0.89 | 1:1.21 | Â |