Ozone has been shown to be an effective disinfectant for drinking water, but there are some drawbacks to its use. One of these drawbacks is that ozone can be difficult to dissolve in water. A static mixer can help to dissolve ozone and improve the effectiveness of its disinfection. In this blog post, we will discuss the benefits of using a static mixer to dissolve ozone in water. We will also describe how a static mixer works and discuss some of the installation tips of static mixer.

A simple static mixer can be used to combine ozone gas with pressurized, flowing water.

Using a static mixer, the ozone gas can be mixed completely into the water. To enhance the solubility of ozone gas in water, pressurize the water when utilizing a static mixer.

Advantages of Dissolving Ozone With Static Mixer

  • Designed to be simple and efficient, with no moving components.·       
  • This is an excellent option for pressurized water.
  • It does not require much energy to operate because there is no pressure differential across the mixer.
  • Oxidation resistance is also lower owing to the low level of oxygen. Because of off-gassing, it’s easier to contain ozone gas and maintain a safe environment.

Disadvantages of Dissolving Ozone With Static Mixer

  • Higher risk of water back-flow into the ozone generator    
  • As the water is pressurized, the chance of it overflowing into the ozone generator increases.

Installation Tips of Static Mixer

  • Install a static mixer after the ozone injection point, ideally within 12 inches. Ozone bubbles are known to shear as they enter the water and rejoin into a big air pocket at the top of the pipe.
  • If water is fed into a tank, the static mixer should be placed within 12″ of the tank.
  • If you’re putting water into an un-pressurized tank, consider using a valve to create back-pressure on the static mixer and improve solubility.
  • To obtain the best water velocity for the mixer in use, make sure that enough water is flowing through the system.

Using Venturi Injector With Static Mixer

There’s been a debate about the usefulness of a static mixer with a venturi injector in mass transfer. However, after the venturi, the use of a static mixer is more of a hindrance to water ozone mass transfer than an aid. A venturi injector is a device used to rapidly dissolve ozone gas in water, allowing it to be flashed off the surface. The whipped-off water is then treated with chlorine or another substance. A static mixer after a venturi causes the dissolved ozone to flash-off and push the ozone back into its gaseous form.

If pressure is not readily available in low-pressure pipeline applications to assist with ozone solubility, a static mixer may be utilized after the venturi. Before the tank, a static mixer could be used before the water enters an un-pressurized tank that is far away from the venturi injector to break up huge gas bubbles. In this way, smaller bubbles will be able to enter the tank and rise gradually .

Prevention of Water Back-Flow

The static mixer is generally used in a pressurized water line with flowing water. To propel the ozone gas into the water, the pressure of the ozone gas must be greater than that of the water pressure. When the ozone generator/ oxygen concentrator is switched off, pressurized water may flow into the ozone gas line and toward the ozone generator. Back-flow prevention equipment will be required to keep water from harming the ozone generator and other delicate equipment.

Also Read: How To Calculate Residual Ozone Concentration For Water Treatment

Water traps, Check valves, or water-trapping devices that trap and drain water from the water line can all be used. Whatever you pick, test and/or replace it on a regular basis to make sure no water gets into your ozone generator cell. 

Bottom Line

Static mixers are an effective way to dissolve ozone in water. They provide a more even distribution of the ozone gas and help to avoid any clogging or build-up that can occur when using other methods. If you’re looking for an easy and efficient way to introduce ozone into your water treatment system, consider using a static mixer.