What Should I Do With My Excess Ozone?

If you have ever been in a pump room when ozone is being made and it is not properly ventilated, you know the smell can sometimes be quite overwhelming. This can easily be avoided if you apply safe ventilation techniques.

There are several types of ozone destruction systems available, such as using ultraviolet light irradiation to decompose ozone as it passes, heating ozone to extreme temperatures (at or above 428 °F [220°C]) for several seconds, or sending the ozone through a catalytic destruct system. We will look at the most popular methods.

Three popular options for controlling off-gas

  • Running a line to off-gas outside
  • An ozone catalytic destruct system
  • Activated carbon destruction method

The “run-a-line” Method

Ozone Catalytic Destruct System with water trap

Ozone Catalytic Destruct System

The cheapest and easiest method is to simply run a length of ozone resistant (typically Teflon®) tubing from a off-gas vent to a elevated location outside of the building. With the half-life of ozone being so short, the excess ozone will quickly revert back to oxygen and be vented to ambient air.  If this is not an option, for example, you are in a basement that has no windows and you can’t easily run tubing under a door outside, then the next option would be a better solution.

If using this method, there are some important points to remember.

  • Make sure your line is free of debris or obstructions. Any blockages will result in back pressuring your tank and therefore causing loss of vacuum at the injector.
  • If you are operating your equipment in freezing conditions, it is advisable to move your tubing to a location that is not affected by the extreme temperature. As with most auto off-gas systems, there will be condensation build up in the lines. If that water freezes, blockages may occur.

Ozone Catalytic Destruct System

The most common method is the catalytic destruct system, which uses Carulite®, a combination of Manganese Oxide and Copper Oxide. These types of destruct systems might also contain some type of heating element to burn off the ozone as it passes to be extra sure of ozone decomposition as well as an additional “water trap” (pictured) to help capture moisture before it can reach the dry media of the destruct.

Activated Carbon Method

Activated Carbon is also an excellent way to eliminate excess ozone. The most important point to remember when it comes to using activated carbon to destroy ozone is to always use a metal container (preferably stainless steel) to hold your carbon media. The reason for this is because the process of passing ozone gas through carbon causes the carbon to heat up and reach extreme temperatures. If you use a plastic container to house your media, you greatly increase your risk of it melting and causing an ozone leak, or worse yet, starting a fire. So, when using activated carbon, keep in mind, use a metal container.

-Authored by Brandon Turney, Service Technician, ClearWater Tech, LLC


How Does Ozone Get Into The Water?

Ozone gas must transfer from its natural gas state into a dissolved liquid state in order to oxidize dissolved contaminants in the water. This is probably the most important step in a successful ozone system.

There are two widely used methods to get the ozone gas entrained into the water; by diffusion or venturi methods.

Most ozone gas produced ultimately off gases to the atmosphere. In order to minimize off gassing, you must keep the gas under pressure for as long as possible for mass transfer to take place.

The venturi method is by far the best method for dissolving ozone. Water traveling through a venturi will create a pressure differential. By having a suction port at that point in pressure drop allows ozone gas to be pulled into the stream, entraining that gas into solution.

The diffusion method is far simpler, yet not as efficient in transferring gas into solution. The diffusion method entails pushing ozone gas into a body of water by the use of some air compressor. By pushing air through an ozone chamber, the gas is created and continues down through tubing into the bottom of some vessel.

To increase transfer of ozone into solution, a diffuser stone is used at the end of the ozone resistant Teflon® tubing to create maximum surface area of ozone bubbles. If you send the gas directly out of the tubing without a diffuser stone, you would have larger bubbles and less contact between water and ozone. This would create more off gassing and obviously less transfer of gas into solution.

– Authored by Tim Chew, Inside Sales, ClearWater Tech, LLC

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