UV for Ozone Destruction in Water Treatment: Reliable, Chemical-Free Dissolved Ozone Removal

Categories: Armour, Armour X, Blog, Commercial, HWC-Series - Commercial, LED-Series - Commercial, MPX-Series, Ozone Destruction, P-Series, S-Series, T-Series, VR W-Series, WF-Series, X-Series

Ozone is a powerful oxidant used in water treatment for disinfection, colour removal, taste and odour control, and advanced oxidation. It is highly effective but must be completely removed from treated water before discharge, reuse or further processing. Residual ozone at low concentrations causes material damage, interferes with downstream biological treatment, and creates health and safety risks in enclosed plant areas.

UV photolysis at 254nm destroys dissolved ozone rapidly and efficiently without adding chemicals or producing problematic by-products. It is the standard approach to ozone quenching in industrial and municipal water treatment systems.

How UV Destroys Ozone

Ozone absorbs strongly at 254nm, the same wavelength used for UV disinfection. When ozone-containing water passes through a UV chamber, the ozone molecule absorbs UV energy and decomposes to oxygen and hydroxyl radicals. The hydroxyl radicals then react with other organic compounds in the water, continuing the advanced oxidation process.

The reaction is fast. Depending on the initial ozone concentration and the UV dose, dissolved ozone can be reduced to non-detectable levels in a single pass through a properly sized UV unit.

Ozone Destruction Application

Applications for UV Ozone Destruction

UV ozone destruction is used in a range of treatment and production settings:

  • Municipal water treatment
    Removing residual ozone downstream of ozone contactors before water enters biological activated carbon filters or distribution.
  • Aquaculture
    Ozone is used for water disinfection and colour removal in recirculating systems, but must be removed completely before water re-enters fish-holding tanks.
  • Semiconductor and electronics manufacturing
    Ozone used for organic surface cleaning must be removed from rinse water before discharge.
  • Food and beverage
    Ozone used for surface sanitation and process water treatment must be removed before product contact.
  • Swimming pools and spas
    Ozone systems require UV or activated carbon quenching to prevent ozone off-gassing at the water surface.

Aquaculture Application

Industrial and Manufacturing

System Design for Ozone Destruction

The primary design parameter for a UV ozone destruction system is the initial dissolved ozone concentration. Higher concentrations require higher UV doses. UV Guard can provide dose calculations for specific applications.

Low pressure UV lamps at 254nm are the standard choice for ozone destruction. Systems used specifically for ozone destruction typically include output monitoring to ensure consistent performance.

UV Lamp Replacement Parts

Commercial UV Systems

Frequently Asked Questions

In many cases yes. UV at 254nm is effective for both purposes. The system must be designed to deliver sufficient dose for whichever application requires the higher dose. UV Guard can advise on dual-purpose system configurations.

Both are used. Activated carbon is catalytic and does not require power, but requires monitoring for exhaustion and carries bacterial growth risks in the carbon bed. UV is instantaneous, requires no media management, and is straightforward to monitor. The choice depends on the application context and system design requirements.

UV photolysis applies to dissolved ozone in water. Off-gas ozone from ozone generators and contactors is managed separately through thermal destruction units or activated carbon ozone destruct units. UV Guard can advise on the appropriate approach for your system.

UV photolysis converts ozone to oxygen and hydroxyl radicals. The oxygen remains dissolved or offgasses harmlessly. The hydroxyl radicals react with organic compounds, which can improve water quality further. No chemical residues are introduced and pH is not significantly affected.

Annual UV lamp replacement and regular quartz sleeve cleaning are standard. UV Guard stocks all common spare parts and can schedule service visits to coincide with planned plant maintenance.

Talk to Us About UV Water Treatment Solutions

Contact UV Guard to discuss ozone destruction system requirements for your application.

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Get in touch

Contact our team for expert guidance on selecting the right UV water treatment system, sourcing compatible spare parts, or confirming the correct components for your existing setup. We can also assist with servicing requirements to help maintain performance and long-term reliability.

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