GDT Process

The Mazzei GDT™ Process, Efficient and Effective Ozone Contacting

In the GDT™ process, high efficiency Mazzei® Venturi injectors aspirate ozone gas from a generator at 1-15% weight providing dynamic mixing and mass transfer. Dissolution is enhanced in a Flash Reactor™, determined for each application on the basis of feed gas concentration, operating pressure, reaction rates and desired transfer efficiency.

After leaving the Flash Reactor, the contacted two-phase flow then travels to the patented degas separator (DS) for additional mixing and entrained gas removal to appropriate off gas processing. As the entrained gas/water mixture enters the degassing separator, it is accelerated to a velocity that exerts 4-10 Gs in a lateral force creating a water film at the separator wall and a gas vortex at the central, gas extraction core.


          Watch our Video:  Wichita Aquifer Project - Mazzei Degas Separator


No other system transfers ozone into solution faster than Mazzei’s patented GDT Process.


          Watch our Video:  GDT Ozone Contacting System Video

gdt process View Sidestream Animation

The GDT Process

1. Ozone Gas: Ozone gas is created from air or pure oxygen with an ozone generator. 2. Mazzei® Injector: Ozone gas is aspirated via the patented Venturi injectors providing dynamic and efficient ozone transfer to solution. 3. Back Pressure Control Valve: The back pressure control valve adjusts injector outlet pressure to optimize ozone mass transfer. 4. Flash Reactor™: The dynamic mixing that occurs at the injector is enhanced in the Flash Reactor™ with high-velocity mixing for additional ozone transfer. 5. Degas Separator: The Degas Separator provides additional mixing and removes any undissolved gas bubbles. The Degas Relief Valve releases the captured entrained gases for processing or venting. 6. Mass Transfer Multiplier (MTM™) Nozzle: The nozzle forces dissolved ozone to thoroughly mix with the untreated water in a pipeline or basin.

An Example of the Pipeline Flash Reactor™ Mazzei® Injectors and MTM™ Nozzles


The Mazzei Injector and Mass Transfer Multiplier Nozzles work together in this Pipeline Flash Reactor, shown above, to inject ozone into the sidestream and then return the aspirated water to the main line through the nozzles for enhanced mixing and mass transfer. Research confirms the effectiveness of this process: Click to view the Abstract of the Research Paper

Steps in Designing an Ozone System:

1. Provide our application specialist or engineer with your water analysis: COD, BOD, coliform count, heterotropic plate count, metals, color, pH, temperature, suspended solids. 2. State your effluent goals (for example: desired coliform count < 300 mpn, or to reduce COD 75%). 3. Ozone dosage and ozone system costs are determined. 4. Costs and dosage are confirmed with an on-site pilot ozone skid for a small (5-15 gpm) trial. 5. Custom ozone disinfection system design is finalized.
To aid in system design, use our Ozone Application Questionnaire