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| Concentration of composite heavy metals | Initial BOD (mg/l) | BOD removed (mg/l) | Final BOD (mg/l) | Reduction at outlet (%) |
|---|---|---|---|---|
| 8 | 281.23 ± 8.02 | 253.21 ± 7.42 | 27.22 ± 1.08 | 90.32 |
| 20 | 274.34 ± 10.31 | 250.98 ± 6.98 | 26.66 ± 1.41 | 90.28 |
| 28 | 278.98 ± 9.41 | 242.96 ± 9.10 | 33.75 ± 1.61 | 87.9 |
| 40 | 284.46 ± 8.89 | 233.65 ± 14.42 | 50.8 ± 1.59 | 82.14 |
