Ozone Dose Calculator

Work out ozone dose instantly with clear inputs, formula shown and shareable results.

About Ozone Dose Calculator

Applied ozone dose times flow gives the mass transferred; dividing by transfer efficiency gives generation capacity needed. Ozone generation from oxygen consumes roughly 8-12 kWh per kilogram. The instantaneous demand from organics and reduced metals must be satisfied before any residual and hence any CT credit is achieved.

Formulas

Ozone mass

Transferred (kg/day) = flow x dose / 1000; generation = transferred / transfer efficiency

Residual

Residual = applied dose x transfer efficiency - instantaneous demand

Worked example

With the default values below, Ozone Dose Calculator returns Ozone Generation Required of 27.778. Change any input above and every figure here is recalculated in your browser.

Inputs used

Water Flowminimum 0 m3/day: 10,000 m3/day
Applied Ozone Doseminimum 0 mg/L: 2.5 mg/L
Ozone Transfer Efficiencyaccepts 0–100 %: 90 %
Instantaneous Ozone Demandminimum 0 mg/L: 1.5 mg/L

Results

Ozone Generation Required: 27.778
Ozone Transferred To Water: 25.000
Expected Ozone Residual: 0.7500
Generator Energy: 277.78

Step by step

1Values used
2Ozone mass
3Residual
4Ozone Generation Required= 27.778
5Ozone Transferred To Water= 25.000
6Expected Ozone Residual= 0.7500
7Generator Energy= 277.78

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Ozone is acutely toxic and a strong oxidant. Generation and contact systems need off-gas destruction, leak detection and ventilation to the applicable safety standard, and bromate formation must be monitored.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Ozone is acutely toxic and a strong oxidant. Generation and contact systems need off-gas destruction, leak detection and ventilation to the applicable safety standard, and bromate formation must be monitored.

Frequently Asked Questions

Why is bromate a concern with ozone?

Ozone oxidises bromide in the source water to bromate, a regulated carcinogen with a limit typically 10 microgram/L. High bromide waters may not be able to use ozone at the dose required.

Does ozone provide a lasting residual?

No. Ozone decays within minutes, so a secondary disinfectant such as chlorine or chloramine is always needed for distribution. Ozone also increases biodegradable organic carbon, usually requiring biofiltration downstream.