Chlorine Conversion to UV Disinfection

Chlorine gas has traditionally been used for wastewater disinfection for many years. Sodium hypochlorite (liquid bleach) is an alternative to chlorine gas; however, it is more costly and has the same environmental concerns.

UV disinfection can easily be retrofitted into an existing chlorine contact tank and has significant benefits compared to chlorine disinfection.

The increasing concerns about the hazards of chlorine disinfection to the public, the operators and the environment have dramatically increased the cost of chlorination and dechlorination chemicals along with the administrative efforts required to meet safety regulations.

UV – the Choice for Wastewater Disinfection

As a result, UV disinfection has increasingly become the choice for wastewater disinfection due to some significant advantages over chlorine-based disinfection. Specifically, UV has been proven effective in various types of effluent, requires less maintenance, and is cost-effective.

Installed in a Variety of Applications

UV has been used to disinfect various types of effluent from low-quality primary effluent to high-quality tertiary effluent. There are nearly 9,000 TrojanUV municipal wastewater installations around the world, and many are treating extremely challenging effluents such as primary effluent and combined sewer overflows.

UV disinfection can be used to treat a wide variety of wastewater effluents including primary, CSO, secondary, or tertiary reuse effluents.

UV has been installed in a variety of applications: 1) Primary effluent disinfection, 2) Secondary effluent disinfection, 3) Tertiary reuse disinfection.

Reduced Maintenance

Advancements in UV technology over the years have significantly reduced the amount of maintenance required by operations staff. Advances such as the automatic ActiClean™ chemical/mechanical cleaning system eliminates the need to manually clean lamp quartz sleeves.

The development of more efficient, longer-life and high-output lamps results in fewer lamps to service and maintain as well as reduces the required footprint. For example, the TrojanUVSigna has been designed with TrojanUV Solo Lamp Technology to make chlorine conversion easier.

Lower Life Cycle Cost

Because no hazardous chemicals are required for UV disinfection, the cost of operating a UV system is significantly lower than chlorine disinfection. In many cases, the installation of UV is a more cost-effective, long-term solution due to the high cost of safety requirements and chemicals for chlorine disinfection (e.g. sodium hypochlorite disinfection).

UV disinfection has a lower life cycle cost when upgrading from an existing chlorine gas system.

UV is Environmentally-Friendly

UV disinfection also has the added benefits of not being affected by temperature or pH of the effluent. UV does not create any disinfection by-products and can disinfect chlorine-resistant microorganisms like Cryptosporidium and Giardia.

The carbon footprint and environmental impact of a UV disinfection system has been shown to be lower than chlorine disinfection since UV disinfection is a physical process that eliminates the need for hazardous chemicals.

UV has lower total carbon emissions (CO2eq) in a lifecycle assessment.

Other TrojanUV Wastewater Applications

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