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UV Disinfection for Municipal Wastewater

Protecting and Preserving our Environment

The final step in the municipal wastewater treatment process is disinfection. Disinfection is required to reduce and destroy the bacteria, virus and protozoa populations in the wastewater before discharge into the receiving body of water. It is critical to the protection of public health and the environment.

Growing awareness of the long-term public safety and environmental costs of chemical wastewater disinfection has led the industry to adopt inherently safer alternatives such as UV.

How UV Light Disinfects Wastewater

UV is an effective, safe and environmentally friendly way to disinfect wastewater. Unlike chemical disinfection in which substantial contact tanks and time are needed, UV light provides rapid, effective inactivation of microorganisms through a physical process. When bacteria, viruses and protozoa are exposed to germicidal wavelengths of UV light, they are instantaneously rendered incapable of reproducing and infecting. The process adds nothing to the water but UV light, has no impact on chemical composition or dissolved oxygen content, and does not create disinfection by-products.

 

TrojanUV Systems for Wastewater

A photo of a TrojanUVSigna bank in a raised position

TrojanUVSigna

The TrojanUVSigna® incorporates innovations, including TrojanUV Solo Lamp® Technology, to reduce the total cost of ownership and drastically simplify operation and maintenance. It is the ideal solution for treatment plants in need of revolutionary UV technology.

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A photo of a TrojanUV3000Plus module

TrojanUV3000Plus

The TrojanUV3000Plus® is one of the reasons why UV is now a favored technology in wastewater disinfection. Often touted as a flagship UV system, it has demonstrated effective and reliable performance around the world. In fact, over 2,000 municipalities rely on it to disinfect over 30 billion gallons of wastewater every day.

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A photo of a TrojanUV3000PTP module

TrojanUV3000PTP

The TrojanUV3000®PTP is pre-engineered for quick, inexpensive installation and is ideal for small wastewater disinfection applications. The system can be equipped with prefabricated stainless steel channels and transition boxes for integration with existing flanged piping.

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A photo of a TrojanUV3000B module

TrojanUV3000B

The TrojanUV3000®B is a simple, yet robust, wastewater disinfection system for small communities and towns.

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A photo of a TrojanUVFit chamber

TrojanUVFit

Depending on site and design conditions, wastewater treatment plants producing filtered effluent sometimes prefer a disinfection solution using in-pipe (also called closed-vessel) UV chambers. The TrojanUVFit® offers an effective, compact, and energy-efficient solution for non-potable reuse.

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A photo of a TrojanUVFlex 100 Series chamber

TrojanUVFlex

The TrojanUVFlex® is ideal for non-potable reuse and other wastewater applications where the treatment of filtered tertiary effluent is required. It is designed with features to make installation and operation simpler, faster and more cost-effective than ever before. Built on the TrojanUV Solo Lamp Technology platform, TrojanUVFlex allows for energy-efficient high-intensity delivery of UV light in an extremely compact footprint.

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UV vs. Chlorine for Wastewater Disinfection

Chlorine gas is typically delivered to wastewater treatment plants in large cylinders mounted on trucks or trains. It is a highly toxic chemical that must be transported and handled with extreme caution. Training programs, certifications and emergency preparedness must be in place and routinely practiced.

Sodium hypochlorite is a diluted liquid form of chlorine. It too must be handled and stored with caution, and containment and leak protection equipment must be in place.

In contrast, UV disinfection systems are safe, simple and straightforward to operate. Operation of a UV treatment system requires no special training or certification, beyond standard start-up training.

Tasks for maintaining a UV system include replacing UV lamps, cleaning the quartz sleeves that house the lamps (though many UV systems now have automatic sleeve cleaning), and routine monitoring for treatment performance.

Comparison of the advantages of UV disinfection versus the disadvantages of chlorine disinfection for wastewater

Effective Against Cryptosporidium and Giardia

Another key advantage of UV is its ability to inactivate chlorine-resistant protozoa that can threaten public health – most notably Cryptosporidium and Giardia. The release of these harmful protozoa into receiving lakes and rivers increases the potential of contamination in communities that rely on these same bodies of water for their drinking water source and recreational use.

Chemical Disinfection

Chemical Disinfection

Chemical Disinfection with Dechlorination

Chemical Disinfection with Dechlorination

UV Disinfection

UV Disinfection

Wastewater Reuse

Municipalities must balance increasing population growth, dry climates and heavy irrigation/agricultural demands. Recycled wastewater provides a cost-effective, local and sustainable water supply for multiple non-potable uses.

Wastewater treatment for non-potable reuse involves a series of well-established biological and physical process steps including filtration and disinfection to ensure the water is clean and safe for distribution.

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