Table 1.
The BOD7 results at 20°C determined by respirometric test, iodometric titration, oxygen sensor, and UV absorption test for wastewaters from Taskila's WTP, Oulu Waterworks.
| Sample | Respirometric test [mg/L] | Iodometric test [mg/L] | Oxygen sensor [mg/L] | UV absorption(a) [mg/L] | |
| Preclarified | 65 | 56 | — | — | |
| 18.05. | Biol.treated | 4.5 | 4.8 | — | 5.7 |
| Outflowing | 5.6 | 5.6 | 5.0 | — | |
| Preclarified | 106 | 108 | — | — | |
| 15.06. | Biol.treated | 4.0 | 6.7 | — | 4.9 |
| Outflowing | 4.2 | 5.8 | 4.0 | — | |
| 24.08. | Biol.treated | 6.2 | 4.5 | 5.0 | 10.6 |
| Outflowing | 7.0 | 6.0 | 8.0 | — | |
| Preclarified | 86 | 66 | — | — | |
| 07.09. | Biol.treated | 5.3 | 6.0 | 4.0 | 2.1 |
| Outflowing | 6.0 | 7.3 | 6.0 | — | |
(a) Results of the UV measurements (correlated to BOD7 value) are the mean values of one-day measurement.