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Oxygen or Air-Feed Ozone Generators?

Nano Generator

One of the first questions one is often faced with in designing an ozone system is whether the application requires concentrated oxygen or simply clean, dry air. I will explain why oxygen-feed ozone generators are the best choice for all industrial applications. It is very likely that your first online search for “ozone generators” will lead you to a series of air-feed generators. Most of these generators are sold as air purifiers for home use but are not practical for industrial applications. In this article, we will show you why oxygen-powered generators are your best option for all industrial ozone applications.

INTRODUCTION

WHAT ARE OZONE GENERATORS?

An ozone generator is a device that produces ozone by breaking apart oxygen (O2) molecules into single atoms, which are attached to other oxygen molecules to form ozone (O3).

Once we understand how an ozone generator works, the problem with air-fed generators becomes clear. Only 21% of air is oxygen, while oxygen concentrators can achieve more than 95% purity. This difference significantly affects the ozone concentration that a generator can achieve. In addition, inside the cells, the remaining 78% of the nitrogen will form nitric oxide deposits. In this way, ozone production will gradually decrease after a few months. Also, you will require an electrode cleaning/replacement generating an additional unnecessary expense for customers.

PRODUCTION AND CONCENTRATION

Ozone generation is the amount of ozone produced over time, measured in grams per hour. Ozone concentration is the amount of ozone in volume, measured in grams per cubic meter or percentage by weight. Before buying an ozone generator, it is essential to understand this and request a performance chart. For example, let’s compare two units, the first and an air-feed ozone generator that produces 1g/h of ozone from 6 LPM of air and an oxygen feed generator that creates 5 g/h from 0.5 LPM of oxygen. Now let’s look at those numbers. For example, the concentration. Imagine running this unit for 1 hr. The air-feed generator will give you 1 gr of ozone dissolved in about 360 liters. The oxygen unit will deliver 5 gr in only 30 liters. And that is the most significant difference.

OZONE SOLUBILITY

Many applications require ozone dissolved in water. The solubility efficiency depends on factors such as temperature pressure and concentration. So, the amount of ozone that you can dissolve in liquids is directly proportional to ozone concentration.

Absolute Ozone gives the following dependency:

 

O3 Concentration %wt% 03 Dissolved in water
1%wt10%
3%wt20-30%
5 – 7 %wt50-70%
8 – 10 %wt80-90%
14 – 14 %wt95%
14 – 22 %wt97%

The Air-feed unit, as you can see, not only produces low concentrations of ozone but also only displaces 10% of that ozone in water at those concentrations. Well-informed consumers will never buy a dry air-fed ozone generator.

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