Required UV-C dose 40 mJ/cm² at 254 nm per WHO drinking-water guideline for log-4 viral inactivation.
Formula
$$ \text{Dose} \propto \frac{P_\text{UV} \cdot t}{V_\text{reactor}} \cdot T_{UV}^{~2} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P_\text{UV}$ | Lamp UV-C output | W | lamp spec |
| $V$ | Reactor volume | m³ | reactor spec |
| $T_{UV}$ | UV transmittance at 254 nm | - | UVT sensor |
Sources
- WHO Guidelines for Drinking-water Quality.
- NSF 55 - UV microbiological water treatment.