Combined sewer overflows were designed to prevent piping back up during intense rainfall. This concept was implemented many years ago and it was supposed to be used very rarely and only for extreme emergencies. Today, however, due to increasing urbanization the CSO use has grown much more and it has reached the point where it is posing a large threat to aquatic and human health. This is not only through general pollution, but also the “cocktail effect” which occurs once sewage water mixes with street run-offs.
These discharges contain a variety of pollutants that may adversely impact the receiving water body, including pathogenic microorganisms, viruses, cysts, and chemical and floatable materials. With chlorine being a standard solution, it soon proved to be nowhere as efficient since the CSO flow rate is highly variable, has a highly irregular chemical composition, and in many cases, residuals from chlorine are forbidden in the discharge area. With adequate filtration or sedimentation for suspended solids, ultraviolet disinfection can provide an undeniably more robust solution for the challenge, as it does not alter the chemical or physical properties of the water.
UV systems are also notoriously efficient against all known bacteria and viruses, ensuring no dangerous pathogens are released back into the environment. It also requires the shortest contact time of all alternatives. ULTRAAQUA UV offers a wide range of closed vessel and open channel solutions to address CSO challenge. ULTRAAQUA UV systems offer dose pacing technology that allows to adjust the UV lamp intensity and provide energy savings for the utility companies. They are also equipped with automated wiping systems ensuring clean quartz sleeves in low transmittance, particle-filled environments.Get in touch
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One of the key challenges in wastewater treatment is low UV transmittance. ULTRAAQUA UV has engineered a range of UV systems specifically for this purpose enabling the inactivation of common bacteria and viruses found in different quality effluents around the world.
UV disinfection is the only disinfection method that efficiently inactivates pathogenic microorganisms found CSO without affecting other water properties or creating by-products. This is exceptionally important as CSO water already possesses a wide range of dangerous microorganisms and pathogens.
Since UV is affective against all known bacteria and viruses, municipalities are secured that the dangerous pathogens won’t be released back into the environment. It is also the only solution that doesn’t create chemical by-products. Lastly, ULTRAAQUA UV systems also use significantly less energy that any other alternatives.
ULTRAAQUA UV offers our customers a wide selection of closed vessel and open channel systems for diverse wastewater applications worldwide. Combined with customization of key features, this helps to deliver the advanced level of solution suitable for each specific treatment layout.