Table 2.
Experimental overview.
| Period |
Filtration velocity |
SWL column 1 |
SWL column 2 |
Experiment |
|---|---|---|---|---|
| [week] | [m/h] | [m] | [m] | |
| 1–9 | 1.5 | 0.05 | 1.20 | Biological ripening |
| 10–13 | 5 | 0.05 | 1.20 | Flowrate increase to 5 m/h |
| 14–19 | 10 | 0.05 | 1.20 | Flowrate increase to 10 m/h |
| 20 | 5 | 0.05 | 1.20 | Flowrate return to 5 m/h |
| 21 | 1.5 | 0.05 | 1.20 | Flowrate reduction to 1.5 m/h |
| 22 | 5 | 0.5 | 0.5 | Stable operation at equal SWL |
| 26 | 5 | 0.5 | 0.5 | 1 mg/L Fe(II) addition in filter bed (column 1) and supernatant (column 2) |
| 27 | 5 | 0.5 | 0.5 | 1 mg/L Fe(III) addition in filter bed (column 1) and supernatant (column 2) |
| 30 | 5 | 0.5 | 0.5 | Disinfection with Cl2 |