Dissolve ozone into water with Venturi Injector

Ozone gas can be dissolved into flowing water via a venturi injector. A venturi injector is typically up to 90% efficient and can be up to 99% efficient at dissolving ozone into water making this the most common and preferred method for ozone injection.

A venturi injector uses a pressure differential across a small orifice with an off-set opening and a suction port. Ozone gas is pulled into the water via the suction port of the venturi. Due to the pressure change and forces present the ozone gas dissolves into the liquid extremely quickly, and efficiently.

Venturi injector in action with clear pipe

To use a venturi injector water must be flowing and water pressure must be present with the ability to drop pressure at the discharge of the venturi injector. Water may already be flowing from another source to provide the flow and pressure, or a dedicated water pump can be provided to provide the flow and pressure needed for the venturi injector.

Mazzei venturi injector flow pattern

Advantages:

  • Extremely efficient
  • Great option for pressurized water
  • More ozone dissolved into water = less ozone off-gassing = safer environment
  • Easier to contain ozone gas and maintain a safe environment due to ozone off-gassing

Disadvantages:

  • Typically requires more energy than other options due to required pressure differential across venturi injector
  • Requires flowing, pressurized water
  • Greater risk of water backing up into the ozone generator as the water is pressurized
  • Venturi can plug or become obstructed in contaminated water

Ozone gas is partially soluble into liquid. However, using proper methods and equipment high mass transfer efficiencies can be realized with any method of dissolving ozone into water. Review the tips below to help design a proper system using a venturi injector in your ozone application.

Fundamentals of Ozone Solubility:

     -Lower temperatures increase the solubility rate of ozone gas into liquid

     -Higher pressures increase the solubility rate of ozone gas into liquid

     -Higher ozone gas concentrations increase the solubility rate of ozone gas into liquid

Note:

We exclusively use the Mazzei Venturi Injector manufactured by Mazzei injector Co. All performance chart and venturi suggestions are based on the Mazzei Venturi Injector.

Design considerations for your ozone system using a venturi injector:

Sizing Venturi Injector properly

Venturi Injectors are available in a wide variety of sizes to meet a wide variety of water pressures and flow-rates. Using the right Venturi Injector for your application is paramount for a successful application.

Each Venturi Injector is provided with a performance chart showing the expected water flow-rate, water pressure, and correlating suction rate based on discharge pressure. Use this to determine the right size venturi for your water flow-rate and/or gas suction needs.

See our article HERE on reading Venturi Injector performance charts.

General Venturi Injector Installation Tips

  • Venturi injectors should always be installed in either a horizontal position or vertical position with the outlet above the inlet (water flowing upward). Never install with the inlet above the outlet as it may cause erratic suction
  • Always install piping after the venturi before flowing water into a tank. At least 12” of piping should be used at the venturi outlet
  • Never restrict the venturi outlet, consider using larger tubing at the venturi outflow than inflow as the pipe will be filled with both the water and added gas that has been pulled into the venturi.
  • For best performance target a 20 PSI pressure differential or greater between the venturi inlet and outlet
  • Install pressure gauges on tee’s directly at the venturi inlet and outlet to verify water pressures

Full Article with additional details HERE

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