In ‘clean’ processes or ultrapure water applications, ozone is mainly used for CIP sanitization purposes in the process water loops. However, residual ozone represents a potential health hazard and it can be damaging to finished goods, as well as to processing and fabrication equipment.
Breakdown of residual ozone is therefore essential in these and other applications before the ozonated water can be used. The process of de-ozonation has been performed in the past by passing through a filter bed of Granulated Activated Carbon (GAC). However, the same porous structure of GAC that enables GAC to remove ozone, allows GAC filters to become prime incubators for micro-organisms. Other methods used are dosing with hydrogen peroxide H2O2 (ozone quenching) or aeration by cascade, in a packed column or by air diffusion.
In purified water systems, strategic placement of properly designed and sized medium or low pressure UV systems simply and effectively reduces residual ozone to below detectable levels with the additional benefit of TOC destruction. Positioning a UV system directly before the water treatment components requiring protection from ozone (e.g. DI polishing) maximizes the sanitizing benefits provided by residual ozone up to that point. When loop sanitizing is required, the UV is simply turned off and any sensitive process step is by-passed for a brief period of time. Using UV to remove ozone has an advantage because UV does not require additives that may leave behind residuals. In addition, dissociation of ozone with UV may also help to oxidize Total Organic Carbon (TOC).
NEW TO UV WATER TREATMENTS?
We are industry experts in the design, production & maintenance of ultraviolet disinfection/treatment systems.
Let our Experts Help Recommend the Right UV Treatment System Based on Your Process Requirements.
Privacy & Cookies Policy
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.