Table 1.
Characteristics of the DAF inlet waters and DAF blank.
| DAF Inlet | DAF blank | |
|---|---|---|
| Raw waters | ||
| pH | 6.9 ± 0.2 | 6.8 ± 0.2 |
| Conductivity (25°C) (mS/cm) | 2.62 ± 0.18 | 2.12 ± 0.16 |
| Total solids (mg/L) | 5520 ± 185 | 3395 ± 165 |
| COD (mg/L) | 3665 ± 150 | 2332 ± 105 |
| Total suspended solids (mg/L) | 1620 ± 80 | 183 ± 20 |
| Turbidity (NTU) | 680 ± 45 | 268 ± 20 |
| Cationic demand (meq/L) | 1.16 ± 0.08 | 0.99 ± 0.07 |
| Total alkalinity (mg/L CaCO3) | 860 ± 60 | 645 ± 45 |
| After centrifugation | ||
| Total solids (mg/L) | 3900 ± 160 | 3210 ± 140 |
| Silica (mg/L SiO2) | 273 ± 15 | 225 ± 12 |
| COD (mg/L) | 2600 ± 90 | 2050 ± 60 |
| Turbidity (NTU) | 21.8 ± 1.5 | 18.0 ± 1.4 |
Average values and 95% confidence intervals were obtained from three replicates.