Ozone Calculators

Tools & Calculators

These are planning tools meant to speed up conversations and comparisons. They are not a substitute for full system engineering.

Water Analysis

Estimate ozone demand from water test results.

Water Analysis Ozone Demand

Choose either the detailed constituent model or the BOD (Biological Oxygen Demand)/COD (Chemical Oxygen Demand)/TOC (Total Organic Carbon) surrogate fields, then this planning tool estimates dissolved ozone demand and applied generator dose using the saved transfer-efficiency assumption.

Detailed Constituents

BOD / COD / TOC Surrogate

Fe (mg/L)

Mn (mg/L)

H2S (mg/L)

Sulfide as S (mg/L)

Free chlorine (mg/L as Cl2)

NH3 (mg/L)

Color (CU / Pt-Co)

Water pH

Additional allowance (mg/L as O3)

Modeled dissolved demand (mg/L): 0
Required applied dose (mg/L): 0
Largest modeled contributor: No entered contributors

Flow for output estimate (L/min)

Flow for output estimate (GPM)

Dissolved ozone needed (g/h): 0
Estimated generator output (g/h): 0
Estimated generator output (lb/day): 0

Suggested generator View product match Based on detailed constituent output.

Use either H2S or sulfide as S if your lab reports the same sulfur in two different units. Free chlorine is entered as mg/L as Cl2 equivalent. BOD/COD/TOC surrogate mode is intentionally separate from the detailed chemistry mode.

Sizing

Dose, contact volume, and flow-based generator planning.

Required Ozone Dose

Estimate the generator output needed to deliver a target dissolved ozone dose at the saved transfer-efficiency assumption.

Water flow (L/min)

Water flow (GPM)

Target dose (mg/L) Assumed transfer efficiency (%)

Dissolved ozone needed (g/h): 9
Estimated generator output (g/h): 10.59
Estimated generator output (lb/day): 0.56

Suggested generator View product match Based on estimated generator output.

Contact Volume Estimator

Estimate the contact volume needed for a selected flow rate and contact time.

Flow (L/min)

Flow (GPM)

Desired contact time (minutes)

Required contact volume (L): 1000
Required contact volume (US gal): 264.17
Required contact volume (m³): 1

Mazzei Selection Tool

Estimate Mazzei injector fit from motive flow, pressure differential, and air suction performance data.

Mazzei Selection Tool

Set the injector operating point, then estimate Mazzei performance from pressure-driven flow and confirm it against the air suction chart.

Inputs

Motive flow rate (GPM)

Motive flow rate (L/min)

Inlet pressure (PSI)

Outlet pressure (PSI)

Desired suction (SCFH)

Desired suction (L/min)

Results

Recommended injector: Calculating
Chart check point: --
Estimated motive flow: --
Estimated air suction: --
Pressure differential (PSI): --
Injector recommendation: Enter an operating point to calculate a Mazzei injector recommendation.

Use these values as a planning duty point. Final Mazzei injector model selection should be checked against the current Mazzei performance curve, water quality, fittings, pump curve, and ozone gas feed conditions.

Conversions

Quick unit changes for output, gas flow, and gas-phase ozone concentration.

Ozone Output Converter

Convert ozone output between grams per hour, milligrams per minute, grams per day, and pounds per day.

g/h

mg/min

g/day

lb/day

Gas Flow Converter

Convert gas flow between liters per minute, SCFH, SCFM, and cubic meters per hour.

L/min

SCFH

SCFM

m³/h

Gas Concentration Converter

Convert ozone in gas form between actual g/m3, dry ppmv, g/Nm3, and weight percent. Feed gas changes the weight-percent result; temperature, pressure, and dew point change the ppm basis.

Ambient air

Dry air (-30°C dew point)

Pure oxygen

g/m³ actual

ppmv dry

g/Nm³ dry

Weight percent

Gas temperature (°C)

Gas pressure (kPa abs)

Dew point (°C)

ppmv on wet-gas basis: 10023
Ozone partial pressure (kPa): 1.0156
Water vapor in feed gas (ppmv): 375

For the same g/m3, ppmv is controlled by gas temperature, pressure, and wet/dry basis. Air versus oxygen mainly changes the weight-percent result.

Gas Concentration by Flow

Use normal gas concentration and normal gas flow to estimate ozone production.

Ozone concentration (g/Nm³)

Normal gas flow (Nm³/h)

Normal gas flow (L/min)

Ozone output (g/h): 30
Ozone output (g/day): 720
Ozone output (lb/day): 1.587
Equivalent dry concentration (ppmv): 9340

mV to ppm Conversion

Orient ORP readings against a simplified dissolved ozone estimate.

ORP to Dissolved Ozone Estimator

There is no single universal conversion from ORP to ozone ppm. This tool gives a rough estimate using a clean-water assumption set and a pH-corrected ORP basis. It is intended for orientation, not final control.

Current ORP (mV)

Dissolved ozone (ppm)

Water pH

Water temperature (°C)

pH-corrected ORP basis (mV): --
Assumption set: Clean water, ozone-dominant

Assumptions: low interfering oxidants or reducers, ozone is the main oxidant driving ORP, near-atmospheric pressure, and useful range mostly below about 1.0 ppm where ORP still changes meaningfully. Higher pH usually requires more dissolved ozone to reach the same ORP. In this simplified model, temperature mainly changes the pH-correction slope rather than acting as a direct ppm multiplier.

Use these numbers as planning estimates. Final sizing should still account for transfer conditions, ozone demand, process objectives, controls, and the practical safety margin needed for the application.