UV Disinfection Calculator
Calculate UV dose and reactor sizing for pathogen inactivation based on flow rate, UVT, and target log reduction.
Inputs
MGD
Results
Design UV Dose
26 mJ/cm²
Required Power
142 kW
UV Lamps Required947
Reactor Vessels48
Estimated Capital Cost$2,873,500
Annual Operating Cost$318,787
Annual Power Cost$124,387
Annual Lamp Replacement$189,400
Headloss through Reactor24 ft
Quartz Sleeve CleaningBi-weekly
No Disinfection ByproductsYes — No disinfection byproduct formation
How to Use This Calculator
- Enter Design Flow Rate (MGD) — use the maximum design flow for conservative sizing.
- Select Target Pathogen (Cryptosporidium, Giardia, or virus) and set the Target Log Reduction required by your permit.
- Enter UV Transmittance (UVT %) from your source water or post-filter measurements — lower UVT requires more power.
- Set Safety Factor (typically 1.2-1.5) and review Design UV Dose (mJ/cm²) calculated for the log credit claimed.
- Review Required Power (kW), UV Lamps Required, and Reactor Vessels for equipment procurement and electrical planning.
- Check Estimated Capital Cost and Annual Operating Cost for budget development and life-cycle cost comparisons with chlorination.
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