The Mazzei GDT™ Process… Efficient and Effective Contacting
In the GDT™ Contacting Process, 1) ozone gas is created from air or pure oxygen with an ozone generator. 2) Ozone gas is then aspirated via the high efficiency Mazzei® Venturi Injectors providing dynamic mixing and mass transfer. 3) The Back Pressure Control Valve adjusts injector outlet pressure to optimize ozone mass transfer. 4) Dissolution is enhanced in a Flash Reactor™, which is sized 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 5) Degas Separator (DS) for additional mixing and entrained gas removal to appropriate off gas processing. As the entrained gas/water mixture enters the Degas 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. The Degas Relief Valve releases the captured entrained gases for processing or venting. 6) Then the Mass Transfer Multiplier™ (MTM) Mixing Nozzles force dissolved ozone to thoroughly mix with the untreated water in the pipeline or basin.
No other system transfers ozone into solution faster than
Mazzei’s patented GDT Contacting Process.
BENEFITS OF MAZZEI GDT CONTACTING SYSTEMS:
- Ozone Concentration – Concentration and solubility are directly proportional — higher ozone concentrations promote the transfer of more ozone into solution
- Gas-to-Liquid Ratio – A lower gas-to-liquid ratio (Vg/Vl) allows for greater ozone mass transfer efficiency
- Water Pressure – Higher pressure yields increased ozone solubility
- Water Temperature – Higher temperature reduces solubility and increases the chemical reaction rate
- Mixing – Intense, forceful mixing allows for the rapid renewal of the gas-liquid interface — increasing the mass transfer rate and the reaction rate
SUCCESSFUL OZONE CONTACTING IS BEST ACHIEVED BY:
- Raising the ozone concentration while lowering the gas-to-liquid ratio
- Operating under the highest water pressure available
- Including the most aggressive mixing components
- Using an integrated system, with intelligent design – Mazzei System components work best together to optimize performance
Steps in Designing an Ozone System:
1. Provide our application 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. Custom ozone disinfection system design is finalized.
To aid in system design, use our Ozone Application Questionnaire and then contact a Mazzei engineer to start the process