Ultraviolet (UV) light is used to disinfect many types of water, including low-quality water like primary treated wastewater and combined sewer overflows (CSOs). CSO treatment is becoming a regulatory requirement in many regions.
Chlorine is traditionally used to disinfect CSOs because of its low cost, but due to the adverse environmental impacts of chlorination byproducts, chlorine residual limits are becoming stricter. UV light is a proven alternative. It is a cost-effective technology for disinfecting low-quality wastewater as long as the system is properly designed.
Because stormwater treatment involves high flows with high suspended solids content, variable temperature, and disinfectant-resistant pathogens, the disinfection
