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Flue Gas Treatment

Flue Gas NOx & VOC Control with Ozone

Controlled ozone oxidation for selected flue gas, NOx and VOC treatment applications, where ozone is used to convert difficult pollutants into forms that can be captured by downstream scrubbing or treatment stages.

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Flue gas NOx and VOC control using ozone oxidation

Ozone oxidation is only one part of the treatment chain. Successful projects depend on pollutant profile, airflow, contact time, injection design and downstream absorption or scrubbing.

Application overview

When ozone can support NOx and VOC control

Ozone can be used as an advanced oxidation step in selected flue gas and industrial exhaust applications. In NOx control, ozone can oxidise nitric oxide (NO) and nitrogen dioxide (NO₂) towards higher oxidation states such as N₂O₅, which can then be absorbed in a suitable downstream scrubber.

This is not a standalone “ozone only” solution. It normally requires controlled ozone generation, injection and mixing, followed by an appropriate removal stage such as alkaline scrubbing or another downstream treatment process. Ozcon supplies ozone generators and system guidance for industrial and environmental control projects.

NOx oxidation before wet scrubbing or absorption
Selected VOC and odour-related flue gas applications
Industrial exhaust streams requiring controlled oxidation
Retrofit support where existing APC equipment can be integrated

Best viewed as an oxidation stage, not a complete treatment plant by itself.

Ozone can change pollutant chemistry, but the oxidised products still need to be captured, neutralised or removed by a suitable downstream process.

Treatment route

A practical ozone oxidation process route

The exact design depends on the pollutant profile, temperature, moisture, dust loading, duct layout and required emission target. A typical approach may include the following stages.

Assessment

Flue Gas Characterisation

Review NOx concentration, VOC profile, temperature, humidity, oxygen content, dust load, airflow and existing air pollution control equipment.

Controlled ozone injection for flue gas treatment

Oxidation

Ozone Injection and Mixing

Ozone is injected into the gas stream under controlled conditions so that oxidation can take place within the available duct or reaction zone.

Downstream scrubbing for oxidised NOx and flue gas pollutants

Removal

Absorption or Scrubbing

Oxidised compounds must be removed using a suitable downstream stage, often involving wet scrubbing or absorption depending on the pollutant and process.

Potential application areas

Boilers Combustion exhaust Industrial stacks Process flue gas VOC oxidation Waste treatment Food processing Odour-linked emissions

Chemistry

NOx oxidation chemistry in simple terms

Many NOx oxidation schemes use ozone to convert less soluble NO into more oxidised nitrogen species that can be absorbed more effectively. The exact chemistry depends on process conditions, but the principle is controlled oxidation followed by removal.

NO oxidation NO + O₃ → NO₂ + O₂

Further oxidation 2NO₂ + O₃ → N₂O₅ + O₂

Overall pathway 2NO + 3O₃ → N₂O₅ + 3O₂

Important design point

Forming more soluble or absorbable oxidised species is only useful if the downstream process is designed to remove them. That is why ozone oxidation is normally considered together with scrubbing, absorption, monitoring and control.

Industrial flue stack and gas treatment system

Project information

What we need to assess a flue gas ozone oxidation project

A useful assessment needs more than a general request for “NOx removal”. The pollutant profile and process conditions determine whether ozone oxidation is likely to be practical.

NOx concentration and target limit
VOC or odour compound profile, if relevant
Gas flow rate and duct dimensions
Temperature and humidity
Dust or particulate load
Available duct length or reaction time
Existing scrubber or APC equipment
Monitoring, permit or compliance requirements

Related resources

Explore related ozone and air treatment resources

Flue gas projects often need ozone generation, ozone safety, industrial odour control and suitable downstream treatment design.

Need to assess a NOx or flue gas treatment project?

Tell us about the gas stream, pollutant profile, flow rate, existing treatment equipment and emission target. We will help you assess whether ozone oxidation is a suitable route.

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Best for quick assessment

NOx oxidation before scrubbing
Industrial exhaust and process flue gas
VOC or odour-linked emission problems
Projects with existing APC or scrubber equipment
Applications needing controlled ozone generation and monitoring