Ozone is a gaseous chemical that may be dissolved into water to produce ozonation, which is used in several types of water treatment and disinfection.

The solubility of ozone gas in a liquid is crucial to consider, as it must be taken into account. If you want to create an aqueous ozone solution with 5 ppm ozone but the theoretical saturation rate is 4.5 ppm because of water temperature, pressure, and ozone concentration. If the saturation rate is 4.5 ppm and your goal dissolved ozone level is 0.5 ppm, your system’s efficiency may be quite high.

The saturation point of ozone in water can be calculated. The solubility of ozone will be the most restricting factor in gaining access to any liquid. Because water is the most frequent medium in which ozone is dissolved, we’ll concentrate on only using water as our liquid during this analysis.

Ozone’s solubility is determined by the temperature of water, the amount of ozone gas in the solution, and the pressure of water. This article will show how these variables impact ozone solubility.

## Saturation Ratio

When ozone is dissolved in a liquid, Henry’s Law is observed. As a result, a saturation ratio must be determined (volume of gas dissolving / volume of liquid). The solubility of ozone may be expressed as follows using the saturation ratio of ozone:

CL = CG x S x P

CL = dissolved concentration in liquid (mg/l)

S = bunsen coefficient (solubility ratio), temperature dependent

CG = gas concentration (g/m3)

P = gas pressure (in atmospheres)

The ratio of gas volume to liquid volume that can dissolve in water, known as the ozone solubility ratio, is calculated from Henry’s law constants according to water temperature. The solubility of ozone gas in water is measured by the hydroxyl ratio. This ratio is used to derive the Henry’s Law formula for determining the potential solubility of ozone gas in water, as seen above. This calculation is utilized in a few situations for reference purposes below.

The solubility in water of ozone at atmospheric pressure is given by the following formula: (1 atm = 14.7 psia). The actual solubility is a theoretical maximum based on the saturation of ozone into water. Many other variables will influence the actual dissolved ozone levels in water. The same is true for organic loading, PH, ozone half-life, and so on. These figures are important in determining what is and isn’t feasible with your existing ozone equipment as well as understanding the variables that influence dissolved ozone levels in water.

## Important Considerations About Ozone Solubility

•   Higher ozone concentrations = higher dissolved ozone levels in the water
•   Higher water pressure = higher dissolved ozone levels in the water
•   Lower water temperatures = higher dissolved ozone levels in the water