Ozone Generator for Water Treatment
What is Ozone?

Discovered by Christian Friedrich Schonbein in 1840, Ozone is triatomic oxygen with the
chemical formula O3.  It derives its name from the Greek word
ozein or ogeiv, “to smell or smell.”
Ozone gas is light blue at room temperature and has a characteristic pungent odor.  Physical
property data is provided in the table below:
Ozone Molecule for Water Treatment
Molecular Weight
48 g/mole
Density Relative to Air
1.66
Specific Weight at 0 degree C & 760 mm Hg
2.143 kg/m3
Heat of Formation
34.5 kcal/mole
Boiling Point
-112 degrees C (dark blue liquid)
Melting Point
-193 degrees C (dark red or blue solid)
At standard temperature and pressure ozone is a blue gas. Ozone forms a dark blue liquid below -112 °C and a dark blue
solid below -193 °C. Ozone is a powerful oxidizing agent, and is unstable, decaying to ordinary oxygen through the
reaction:  2O3 → 3O2.
Typical Ozone Lifetime as a Function of Temperature

Gaseous                                                                        Dissolved in Water (pH 7)
Half Life Time        Temperature                                   Half Life Time        Temperature
3 months                -50 C                                                30 minutes             15 C
18 days                  -35 C                                                20 minutes              20 C
8 days                    -25 C                                                15 minutes              25 C
3 days                     20 C                                                12 minutes              30 C
1.5 hours                120 C                                                 8 minutes              35 C
1.5 seconds            250 C                                                 

Values based on thermal decomposition only, does not consider chemical reactions, wall and catalytic effects.

    Approximate Solubility of Ozone in Water
    As a Function of Temperature and Ozone Gas Concentration




















Note: According to Henry's Law, the solubility of a gas in a liquid is related to the concentration of that gas in the gas phase.  Ozone is typically produced at a
concentration of 2.5 to 10 wt % in air or oxygen.  The figures above are based on theoretical considerations for pure water and adjusting the value to reflect the
lower gas concentration.  As shown in the chart above, ozone solubility decreases with increasing water temperature.  
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Air and Water Treatment
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What is Ozone and What are its Properties

Temperature (Degrees C)
mg/l
100% Ozone in Gas
mg/l
2.5 wt % Ozone in Gas
mg/l
5.0 wt. % Ozone in Gas
mg/l
10 wt. % Ozone in Gas
0
1090
27.5
54.5
109
10
780
19.5
39
78
20
570
14.25
28.5
57
30
400
10
20
40
40
270
6.75
13.5
27
50
190
4.75
9.5
19
60
140
3.5
7.0
14