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| CNDE | 1 | 2 | 3 | |
|---|---|---|---|---|
| pH | 6.7 | 7.2 | 6.9 | 7.4 |
| CODCr (after 5 hours) | 70.5 | 30.9 | 33.8 | 25.0 |
| BOD5 (after 5 days) | 10.9 | 11.2 | 8.4 | 7.7 |
| BOD5/CODCr | 0.15 | 0.36 | 0.24 | 0.31 |
| Zinc | 0.02 | 0.01 | na | na |
| Free Cl | 0.01 | na | na | 0.01 |
| Turbidity (NTU) | 0.2 | 0.2 | 0.1 | 0.2 |
