How to Size an Industrial Ozone Generator for Water Treatment
A practical buyer's guide to estimating ozone capacity, gas source, contact time and safety equipment for drinking water, wastewater and process water projects.
Start with the treatment objective
Ozone sizing depends on the target result: disinfection, color removal, odor control, COD reduction, micro-pollutant oxidation or advanced oxidation. Each objective requires a different ozone dose and contact strategy.
Estimate ozone demand from water quality
Key inputs include flow rate, COD/TOC, UV254, color, bromide, suspended solids, pH and temperature. For municipal drinking water, the design may focus on CT value and downstream BAC performance. For industrial wastewater, pilot testing is often needed because refractory organics consume ozone unevenly.
Choose air, oxygen or LOX feed gas
Air-source systems are simple for small capacities. Oxygen-source and LOX systems provide higher ozone concentration and better mass transfer for kg/h-class plants. Large municipal and industrial projects usually use PSA, VPSA or liquid oxygen depending on local utility costs and site constraints.
Do not ignore dosing and off-gas safety
A complete ozone system includes dosing, contact, cooling, instrumentation and tail-gas destruction. Buyers should evaluate transfer efficiency, contact tank design, residual ozone monitoring and destructor capacity together with the generator itself.