What is so important about ozone destruction?

Posted by Brialle Veldman on June 13, 2017 under Air Treatment & Odor Control | Be the First to Comment

When it comes to assisting customers with their applications; One the most important factors we consider is how to safely destruct the off-gas ozone. Below, we  have listed some questions to help us understand what to search for.

  1. Why should anyone use an ozone destruct unit?

The use of an ozone destruct unit is an essential step to complying with safety measures, especially when handling higher concentrations of ozone. The reason for this is because the oxidating potential of ozone can harm human tissue. It can be harmful to people, pets, and other living organisms if not handled properly. An ozone destruct unit will safely destroy an excess ozone that is present from the contact tank or emitted in the ambient air from an enclosed space.

  1. Which ozone destruct unit do I need?

All ozone destruct units are designed to perform the same task, which is to destroy ozone. However, there are differences to each situation that will affect the performance of each within a specific application. Here are a few factors to consider when narrowing down the best destruct unit:

  • Will you require a high concentration ozone destruct unit or an ambient air ozone destruct unit?
  • Will the air stream be a wet air stream or dry air stream?
  • What is the initial ozone concentration and what is the desired outlet ozone concentration?

*Follow the information to narrow down your search to determine the right product.

  1. What is a high concentration ozone destruct unit?

ODS-1 Ozone Destruct Unit                                   ODS-2 on Electric Motor

The term high concentration refers to any ozone concentration above human permissible level. Usually this means the excess ozone is a by-product of an ozone process. A few examples of this may be:

  • Ozone off-gassed from a contact tank
  • Ozone within a disinfection chamber
  • Ozone in a vent hood

At Ozone Solutions, we market our high concentration Ozone Destruct Units with the prefix ODS. Our ODS Ozone Destruct Units will not operate with ozone levels beyond 20% by weight. The ODS are passive devices meaning there is no integrated device to move air through the unit, air flow must be provided by the customer application. These destruct units are sized on air flow in CFM. For example, the ODS-3 is a high concentration ozone destruct unit that is rated for 3 CFM of air flow.

4. What is an ambient air ozone destruct unit?

NT-70NT-70 in laboratory

We also designate our ambient air ozone destruct units with the prefix NT. Our NT ozone destruct units have integrated fans to move through the destruct unit. These units are sized on air flow in CFM. For example, the NT-70 is an ambient air ozone destruct unit that moves 70 CFM of air. Ambient air ozone destruct units operate within environments such as the name implies, in the ambient air. These devices are used to remove ozone within occupied space, or space where ozone levels need to be lowered for a process. A typical application may be within a laboratory chamber where ozone will negatively affect a test or process. A few other applications apply to this such as:

  • Micro-array test chamber
  • Small occupied space with ozone levels above the OSHA levels
  • Disaster remediation pack-out rooms
  • Hotels

5. What is a wet air stream?

ODS-1H    

A wet air stream is any air stream that uses water to create aqueous dissolved ozone.  Many times, customers use this on an ozone contact tank or water storage tank. This air will be moisture laden and have a high humidity level. The catalyst material inside the Ozone Destruct Unit will be destroyed by condensation. To destroy ozone in a wet air stream the Ozone Destruct Unit must be manufactured to prevent moisture from condensing on the catalyst. Also, a wet air stream must pass through the Ozone Destruct Unit at 1/2 the flow rate of dry air to achieve the same efficiency. Ozone Destruct Units designed to operate in a wet air stream must be larger, and hold more catalyst to work efficiently.

At Ozone Solutions we designate Ozone Destruct Units designed for wet air streams with the H suffix. For example, the ODS-3H would be suitable for a wet air stream, while the ODS-3 would only be suitable for a dry air stream.

ODS-H destruct units are manufactured with a heater to warm the air and catalyst inside the Ozone Destruct Unit. Also, they feature an air gap that will equalize the air flow and speed. There is also piping used in the ODS-H series to ensure the air is properly warmed prior to contacting the catalyst, and for the potential of condensed moisture to drop via gravity back into the incoming tubing.

What is a dry air stream?

A dry air stream is any air stream without condensation. Normal ambient humidity levels up to 85% should be considered a dry air stream. Any of ozone solutions ozone destruct units will be suitable for a dry air stream.

How do I determine the effluent ozone concentration?

This is an important but commonly overlooked factor when choosing the right destruct unit. All our units are rated based on air flow in CFM. There is also an efficiency rating for each unit. Either 99.96% for the ODS series, or 99% efficiency for the NT-Series. This efficiency rating is a the maximum air flow for each device. For example, the NT-70 will destroy 99% of the ozone gas in a 70 CFM air stream.

What happens to the ozone?

The ozone is catalyzed back into oxygen through a catalytic process using the ozone destruct catalyst. This is a catalytic reaction requiring no consumables.  The catalyst used inside all the ODS is a proprietary granular media. The NT Series of destruct units use a proprietary honeycomb material to destroy ozone.

Catalyst in BucketODS Unit with Catalyst ODS Catalyst

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