Ozone for Water Purification

Water Ozonation Safety

Ozone is an incredibly safe agent to use for Water Purification. Like anything we use today, there are some safety factors to take into account, whether you are ozonating water to drink, ozonating water for your swimming pool, hot tub, or fish pond. Ozone is safe to use as long as sufficient safety procedures have been taken into consideration.

Ozone Offgassing
The main safety procedure is to make sure that high concentrations of ozone gas is not released into the room or building as it will have a negative impact on people, pets, and plants. Ozone is an irritant to the lungs, eyes, and mucosal tissues. You need to ensure that the ozone is always contained or destroyed.

  1. If you are ozonating water to drink, you need to ensure that the ozone gas is destroyed as it leaves the water. Some people may like the idea of ozonating just one glass of water at a time, but that ozone coming out of the glass after it has been bubbled through the water needs to be destroyed. Make sure the manufacturer has provided you with a way to collect and destroy this ozone gas before it is released into the room around you.
  2. Ozonation systems for pools should be designed to remove the gas bubbles from the water before it is returned to the pool. Usually the water containing the gas bubbles is sent into an offgassing tank, where the water drops to the bottom of the tank and the gas comes to the top. The gas is then vented out the top of the tank and destroyed by an ozone destroyer.

Backflow Prevention
Any system producing a gas has the potential to ‘suck back’ or create a vacuum when turned off, or if conditions change in the system. So, all ozone generators designed to produce ozone for water purification are susceptible to ‘backflow’ of the water into the ozone generator itself.

  1. Water Trap: The most common method to prevent backflow is the Water Trap which is a vessel that will trap water if it tries to return to the ozone generator, essentially stopping the water from moving backwards to the ozone generator.
  2. Check Valves: In all other industries (that use flowing gas that is not ozone) Check Valves are the most common way to stop water from flowing backwards. Unfortunately Check Valves are easily oxidized by highly concentrated ozone and they will fail. Relying on a Check Valve only is a recipe for disaster, because the check valve will be oxidized by the ozone, it will fail, and water may then be allowed to enter the ozone generator. For this reason, the preferred method is the Water Trap. Those who wish to use a check valve in spite of this information should ensure that a high quality Water Trap is used as a backup.

That’s it? No concerns about toxicity of ozone or residuals left in the water after ozonation? No. Ozone is a safe, non-toxic agent perfect for water purification.


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