Non-potable Reuse

TrojanUV systems play a critical role in municipal wastewater recycling and reuse initiatives around the world

About Treating Wastewater for Non-potable Reuse Applications

  • 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

  • Disinfection is the critical last step in the reuse treatment process to destroy harmful microorganisms in the water

Municipalities in arid regions are acutely aware of the need to conserve their community’s drinking water supplies, and one very effective way to do so is by treating and reusing wastewater. Recycled water can be used or sold for a variety of purposes, including recreational and agricultural irrigation, industrial processes, construction, street sweeping and more.

UV Protects Against Bacteria, Viruses, and Protozoa

UV is an effective, safe, and environmentally friendly way to disinfect wastewater to the stringent limits required for reuse. It provides broad-spectrum protection against a wide range of pathogens, including bacteria, viruses and chlorine-resistant protozoa such as Cryptosporidium and Giardia.

UV disinfection is a physical process that rapidly disinfects microorganisms as they pass by ultraviolet lamps submerged in the water. Within only a few seconds of exposure, the DNA of the microorganisms is permanently altered and the bacteria can no longer reproduce or infect those coming in contact with the water.

Rendering of UV energy damaging a microorganism's DNA

Within only a few seconds of exposure, UV light destroys the DNA and RNA of bacteria, protozoa and viruses, eliminating their ability to reproduce or cause infection.

UV is Ideal for Reuse

Chlorine, while an effective disinfectant, is a toxic, hazardous chemical that can be harmful in the event of a leak or spill. It also has the potential to create carcinogenic by-products which can be harmful to receiving waters and aquatic life. Balancing the high chlorine doses required for reuse water disinfection and the stringent low limit on chlorine residuals is a complex task.

UV is a simpler and safer alternative. Here’s why:

UV in Action


Preserving Water Resources in Lake Arrowhead, California

During a multi-year drought, the Lake Arrowhead resort community started looking at ways to further protect, preserve and supplement their water resources. They chose to install a TrojanUVFit® system at the Grass Valley Wastewater Treatment Plant to disinfect filtered wastewater to stringent standards for irrigation purposes. This effective process conserves the community’s clean water resources for potable uses and complies with California Water Recycling Criteria Title 22.

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Case study about the TrojanUVFit installation at the Grass Valley Wastewater Treatment Plant in Lake Arrowhead, California

UV Disinfection Upgrade for Water Reuse in Ewa Beach, Hawaii

When the Honouliuli water recycling facility (WRF) was first constructed, a TrojanUV4000® was installed to help recycle wastewater to Class R-1 reuse standards for various uses such as irrigation. After 15-years, they proactively sought to replace their TrojanUV4000, and selected the TrojanUVSigna® in order to take advantage of TrojanUV Solo Lamp® technology, which reduces both electrical consumption and power costs.

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Case study about the TrojanUVSigna installation at the Honouliuli Water Recycling Facility

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