TECHNICAL GURU
Ozone…..
How do I apply it? by Amy Stone*
The effectiveness of ozone correlates directly with the amount of ozone over a period of contact time, usually expressed as mg/L x CT. The possibilities are endless!
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s a continuation of a previous column on ozonation, in this article we will cover different methods of applying ozone to a filtration system. The original column, titled Ozone – Go Zone or No Zone, was published in Aquaculture Magazine 45-2 (AprilMay 2019). In that column the different methods of making ozone were discussed. What do we do with the ozone once it has been made? The possibilities are endless! The effectiveness of ozone correlates directly with the amount of ozone over a period of contact time, usually expressed as mg/L x CT. An example is 1mg/L for 2 minutes contact time. This column will discuss some of the most common options for ozone contact and injection.
Diffusers in an Open Top Tank When I first started seeing ozone applied, it was in Central America at several of the shrimp farms we were working with at the time. In most cases, the ozone was generated and applied directly to the incoming water basins via air diffusers. While this method will work, it also has a few considerations. The most important consideration is that the ozone is off gassing directly to atmosphere and generally in a semi-closed building. This presents both a health hazard and additional wear and tear on the building since ozone is extremely caustic. This is one of the most inexpensive ways to add ozone to a system is through diffusers, such as ultra-fine pore ceramic diffusers, glass bonded silica diffusers or other types. This is true only because the diffusers themselves are inexpensive. However, in terms of efficiency, this can be one of the least effective ways to add ozone to a system since the gas is no longer pressurized once it leaves the diffuser. This is not something that is recommended unless there are no other options, and the proper precautions are taken. From a health hazard point of view, the inhalation of ozone gas will 70 »
DECEMBER 2020 - JANUARY 2021
