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Ozone Dosage vs Dissolved Ozone

The quantity of ozone applied to the water will always exceed
the amount of ozone actually absorbed into solution.

Often times, due to system ineffiencies, a portion of the ozone off-gases without being absorbed into the water. This wasted ozone must then be vented outside or destroyed with an
ozone destruct unit.

Ozone dosage: the amount of
ozone applied to the water

Dissolved ozone: the amount of
ozone measured in the water

Questionmark


What are the units of
dissolved ozone?



The units are PPM or mg/l. They are
equivalent with a 1:1 ratio.


AS-500 Dissolved Ozone Monitor

What are the units of ozone dosage?
The units are also PPM or mg/l. But how can this be, if ozone has not actually been dissolved into solution?




Remember that PPM is a ratio. 1 PPM is one part ozone for every 1,000,000 parts molecules of water. An operator will know the quantity of ozone being produced.
They will also know the quantity of water passing through a venturi (the typical method of injecting ozone). The ratio of generated gas to moving liquid will give us a value which can be expressed in PPM (or mg/l).

You might see an ozone system parameter which state 2.0 PPM ozone dosage. Do not confuse this with dissolved ozone. 2.0 PPM ozone dosage will often translate into 1.00 PPM, or less dissolved ozone due to losses.


The amount of ozone that you place into the water will not remain that same value. The dissolved ozone will be reduced
by the water conditions, such as the temperature, organic pathogens, etc. To obtain the desired dissolved ozone level, you must add ozone until you overcome the contaminants and the other ozone diminishing conditions.



Did you know that there are a few ozone injection systems that can exceed 90% mass transfer efficiency in clean water?
They utilize pressure and high ozone concentrations - see how it's done!.




Last Updated: July 29, 2014

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