Table 2 The main characteristics of raw wastewater and the treated effluents
Parameter | Raw wastewater | UASB Effluent | %R | DHNW | %R | ABR | %R | T%R |
|---|---|---|---|---|---|---|---|---|
pH | 7.5 | 7.2 | Â | 7.3 | Â | 7.2 | Â | Â |
COD | 386.4 | 141.3 | 63.4 | 60.0 | 57.6 | 30.9 | 48.7 | 92.0 |
BOD | 296.3 | 99.7 | 66.3 | 29 | 71.7 | 13.8 | 49.8 | 95.4 |
TSS | 139.8 | 41.8 | 70.0 | 15.6 | 62.4 | 4.2 | 74.1 | 97.0 |
TKN | 38.8 | 34.5 | 11.0 | 16.3 | 52.5 | 13.0 | 19.6 | 66.6 |
Ammonia | 31.7 | 29.3 | 7.3 | 14.2 | 51.7 | 11.0 | 19.5 | 65.3 |
Nitrates | 0.058 | 0.021 | 64.2 | 0.114 | − 535.2 | 0.034 | 69.8 | 41.4 |
Nitrites | 0.005 | 0.003 | 39.8 | 0.003 | − 8.4 | 0.004 | − 34.1 | 17.4 |
TP | 6.2 | 5.0 | 19.7 | 4.0 | 20.5 | 3.3 | 17.3 | 47.2 |
FC | 1.0 × 107 | 3.9 × 105 | 96.1 | 7.2 × 104 | 81.5 | 1.5 × 103 | 79.9 | 99.99 |