Optimum treated water quality is shown in Table 1. The waters differed in both DOC and bromide concentrations and hence had different bromide to DOC ratios (Br:DOC).
Raw and treated water quality at optimum coagulant dose
| . | Reservoir WA . | River SA . | . | ||
|---|---|---|---|---|---|
| Parameter . | Raw . | 125 mg/L alum . | Raw . | 70 mg/L alum . | Units . |
| pH | 5.3 | 6.3 | 8.1 | 6.6 | |
| Colour | 158 | 5 | 39 | 3 | HU |
| Turbidity | 4.2 | 0.1 | 55 | 0.1 | NTU |
| UV254 | 0.721 | 0.118 | 0.254 | 0.053 | abs/cm |
| DOC | 13.8 | 7.2 | 7.2 | 3.1 | mg/L |
| SUVA | 5.22 | 1.64 | 3.5 | 1.66 | abs/m/mg/L |
| Bromide | 0.60 | 0.55 | 0.07 | 0.06 | mg/L |
| Br:DOC | 1:23 | 1:13 | 1:103 | 1:52 | ratio |
| . | Reservoir WA . | River SA . | . | ||
|---|---|---|---|---|---|
| Parameter . | Raw . | 125 mg/L alum . | Raw . | 70 mg/L alum . | Units . |
| pH | 5.3 | 6.3 | 8.1 | 6.6 | |
| Colour | 158 | 5 | 39 | 3 | HU |
| Turbidity | 4.2 | 0.1 | 55 | 0.1 | NTU |
| UV254 | 0.721 | 0.118 | 0.254 | 0.053 | abs/cm |
| DOC | 13.8 | 7.2 | 7.2 | 3.1 | mg/L |
| SUVA | 5.22 | 1.64 | 3.5 | 1.66 | abs/m/mg/L |
| Bromide | 0.60 | 0.55 | 0.07 | 0.06 | mg/L |
| Br:DOC | 1:23 | 1:13 | 1:103 | 1:52 | ratio |