TrojanUV systems are installed in secondary and tertiary wastewater treatment plants around the world
Wastewater treatment plants utilizing secondary and tertiary treatment processes typically require a microorganism-treatment step prior to discharging effluent into receiving waters.
The microorganism-treatment limits for wastewater systems are typically measured in the number of colony forming units (CFU) per 100 mL of effluent. The CFU measured is typically fecal coliform, but some regulatory bodies require measurement of Escherichia coli (E .coli), total coliform or enterococci.
The main objective of microorganism-treatment is to reduce the number of microorganisms to permissible levels.
UV is an ideal treatment solution for wastewater treatment plants using secondary and tertiary treatment processes. It is effective against chlorine-resistant microorganisms Cryptosporidium and Giardia.
The type and size of UV treatment system is influenced by upstream secondary and tertiary treatment processes. Generally, higher quality effluent requires less UV equipment due to its higher UV transmittance (UVT) and lower total suspended solids (TSS).
UVT is the ratio of light entering the water to that exiting the water. Simply put, water with high UVT (e.g., 85%) is relatively clear, whereas water with lower UVT is more turbid.
| Upstream Process | Typical UVT |
| Primary Treatment | 10% - 45% |
| Lagoon | 30% - 55% |
| Fixed Film (Trickling Filter, Rotating Biological Contractor) | 45% - 65% |
| Activated Sludge/Suspended Growth | 55% - 75% |
| Media Filtration | 60% - 80% |
| Membrane Filtration | 65% - 85% |
Suspended solids are microorganism-laden particles of varying number and size. TSS levels are directly related to the concentration of particle-associated microorganisms and are more difficult to treat than free-floating microorganisms. Particles reduce the UV intensity by absorbing and scattering UV light.
The UV dose required for system sizing will depend on the standard to be achieved and regulatory requirements.
The Water Pollution Control Department of the Unified Government of Wyandotte County and Kansas City, KS provides wastewater and stormwater services for more than 150,000 residents. Their top priority is protecting public health and the environment, and they work tirelessly to ensure that both wastewater and stormwater are treated and returned safely to the Missouri River.
So, when they were informed that it would take approximately $150,000 to keep the aging UV system operational, Unified Government and its Water Pollution Control Department decided to look into other UV equipment suppliers and investigate another UV solution. They were looking for a UV solution that would provide them with a better user experience and be easier to maintain.
The Metropolitan Water Reclamation District of Greater Chicago (MWRD) – of which the Terrence J. O’Brien Water Reclamation Plant (WRP) is part of – has made a number of upgrades to its treatment process in recent years. The addition of UV has been a critical part of these upgrades; it played a key role in improving water quality throughout the Chicago Area Waterway System (CAWS).
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.
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.
The TrojanUV3000®PTP is pre-engineered for quick, inexpensive installation and is ideal for small wastewater applications. The system can be equipped with prefabricated stainless steel channels and transition boxes for integration with existing flanged piping.
The TrojanUV3000®B is a simple, yet robust, wastewater treatment system for small communities and towns.
The TrojanUV3000Plus® is one of the reasons why UV is now a favored technology in wastewater treatment. 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 treat over 30 billion gallons of wastewater every day.
Depending on site and design conditions, wastewater treatment plants producing filtered effluent sometimes prefer a 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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