| Min | Max | Avg | Standard deviation |
BOD5/COD | 0.704 | 0.636 | 0.664 | 0.038 |
COD/BOD5 | 1.419 | 1.571 | 1.505 | 0.107 |
TSS/BOD5 | 1.358 | 1.809 | 1.612 | 0.318 |
Oxidizable materials (mg/L) | 184.6 | 250 | 217.3 | 46.24 |