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Wastewater UV Disinfection Systems

  Commercial Residential UV Water Purifiers  UV PRODUCTS



Wastewater UV Purifiers
Open Channel Wastewater UV Disinfection Systems

Vertical Open Channel UV Systems
  • Recommended for municipal applications with medium to large flow rates starting at .5MGD
  • Proven chemical free UV disinfection
  • Effective on a wide range of pathogens and parasites
  • Economical to operate and maintain

Germicidal UV systems are rapidly becoming standard for wastewater disinfection in large municipal and industrial applications. After the water is treated initially and all particles are filtered out, it goes through the UV system which inactivates all remaining pathogens prior to releasing it back in the environment.

The main benefits of using germicidal ultraviolet systems versus chemical disinfection is that UV cost-effectively provides instantaneous disinfection, does not a create any harmful by-products, eliminates dangerous and costly storage of chemical disinfectants and is overall a much more environmentally friendly method.

Inactivation of pathogens in wastewater is carried out by ultraviolet lamps that emit UV-C energy which targets the DNA or RNA of microorganisms. Exposure to UV-C light breaks down the DNA/RNA which prevents the microorganism from reproducing. Germs that cannot reproduce, cannot infect and are therefore rendered harmless.

Specially designed UV lamps are housed in quartz sleeves, which are in turn housed in a disinfection system (open channel or closed chamber). The quartz sleeves not only help maintain the best operating temperature, but also prevent lamps from coming in contact with the water. A quartz sleeve looks like glass, but unlike glass, it is transparent to UVC rays. While in the system, the wastewater is exposed to a high dose of UV energy. The UV dose equals the UV lamps intensity multiplied by residence time. UV dose is usually represented in microwatt-seconds per square centimeter (µWs/cm˛). Time is the hydraulic residence time in the UV system.

The UV intensity is a function of the lamp type, the arrangement of lamps and the energy absorbing elements in the water that interfere with the UV light before it reaches the targeted microorganism. The ability of the water to transmit germicidal UV energy is referred to as UV transmittance (UVT). UVT is expressed as a percentage from 0 to 100. Clear potable water has UVT of 90% or higher. Most wastewater plants average 65% UVT.

Once all relevant information has been accumulated, a system will be designed based on mathematical and biological data. This data will need to be reviewed by project engineering team to determine the best orientation and the best UV lamp technology. The engineering team will also analyze any issues that
would interfere with system performance.

Wastewater UV System Design



• Peak flow rate
• Discharge permit
• Location (indoor/outdoor)
• System (channel/chamber)
• Lamp type (low/medium)

• Low UV transmission (<50%)
• High total suspended solids
• High total dissolved solids
• High mineral content (iron)
• Environmental location

Contact American Air & Water for Wastewater UV systems


 Horizontal open channel wastewater UV system

Vertical open channel wastewater UV system

Closed chamber wastewater UV system with medium pressure lamps

Inline chamber wastewater UV system with low pressure lamps


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