Properties

Physical Properties of ozone:

Formula : O3

Colour : Colourless gas

Melting point : -193 C

Boiling point : -112 C

Density : 2.14 g/ltr.

Solubility in water @ 20 C : 0.381 ltr. O3 /ltr water

Solubility in water @ 60 C : 0 ltr O3 /ltr water

Strong UV adsorption @ 254 nm

Other properties of ozone:

Ozone at atmospheric conditions is highly unstable and reduces to oxygen. It has a half life of 20 mints. in water and 60 mints. in air

Decay products of ozone are environmentally safe

Ozone is a colourless gas, 1.5 times heavier than oxygen

It has a very pungent smell at as low a concentration as 0.03 ppm in air

Ozone is a very powerful oxidising agent and hence a very potent disinfectant. It is over 3000 times more powerful than chlorine in its disinfective property and over 50 times more powerful in its oxidative property. While undergoing reduction reaction, ozone reduces to oxygen, which makes it one of the most environment friendly treatment reactions known today

Ozone as a micro-flocculant :

Besides these properties, ozone acts as a micro-flocculant. Oxidation of dissolved organics with ozone results in polar and charged molecules that react with polyvalent aluminum or calcium to form precipitates. This also improves in settling property of the particles at as low a dosage of 0.5 ppm. The precipitate can be removed by filtration thereby reducing the suspended particles in water. This results in decrease in turbidity. Often this part of ozone treatment is referred to as pre-ozonation

Electro Chemical Oxidation Potential Of Ozone

The table below compares the Electro Chemical Oxidation Potential Of Ozone (EOP) of various oxidants