Physicochemical parameters | Sampling sites along the wastewater channel | Discharge limit values | |||
E1 | E2 | E3 | FEPA | EEPA | |
Temperature (˚C) | 26.97 ± 0.06 | 26.00 ± 0.01 | 24.93 ± 0.06 | <40 | 40 |
pH | 9.33 ± 0.06 | 8.89 ± 0.01 | 8.33 ± 0.01 | 6 - 9 | 6 - 9 |
EC (µS∙cm−1) | 15670.00 ± 20 | 14830.00 ± 10 | 14496.67 ± 40.41 | 2500 | - |
TDS (mg∙L−1) | 9370.00 ± 10 | 8890.00 ± 8.1 | 8723.33 ± 5.77 | 2000 | - |
TSS (mg∙L−1) | 4979.33 ± 26.86 | 3540.00 ± 20 | 2647.67 ± 7.50 | 30 | 50 |
Chloride (mg∙L−1) | 6111.67 ± 73.2 | 5615.77 ± 24.8 | 5555.78 ± 23.74 | 600 | 1000 |
BOD5 (mg∙L−1) | 960.34 ± 33.24 | 852.00 ± 29.21 | 842.00 ± 27.5 | 50 | 200 |
COD (mg∙L−1) | 2011.00 ± 45.67 | 2000.45 ± 43.5 | 1950.75 ± 39.2 | 500 | 500 |
Total ammonia (as N) (mg∙L−1) | 520.44 ± 29 | 430.34 ± 25.44 | 401.23 ± 23.5 |
| 30 |
Total nitrogen (as N) (mg∙L−1) | 720.46 ± 33.5 | 691.11 ± 31.44 | 665.43 ± 28.5 |
| 60 |
Total phosphorus (as P) (mg∙L−1) | 30.12 ± 3.11 | 24.33 ± 2.23 | 19.55 ± 1.55 |
| 10 |
Sulphide (as S) (mg∙L−1) | 35.56 ± 4.55 | 29.39 ± 3.45 | 21.05 ± 2.7 |
| 0.1 |