Many municipalities had adopted ultraviolet (UV) disinfection treatment over chemical based disinfection. UV disinfection is efficient, low cost and an environmentally friendly way to disinfect water. The process is safer for operators and the community; UV is a chemical free process that adds nothing to the water but light. Read more about how the UV disinfection works. Unlike chlorine, UV disinfection is able to inactivate pathogens such as Giardia and Cryptosporidium. Discharged wastewater with these pathogens becomes dangerous drinking and recreational water for downstream communities.
ETS-UV disinfection is ideal for chlorine conversion
Municipal wastewater has traditionally been disinfected using chlorine. Awareness of the environmental toll and long-term public health of chemical disinfection, led the Environmental Protection Agency (EPA) to establish regulations to residual chlorine limits and disinfection byproducts (DBP's). When chlorine is added to wastewater, it can alter organic matter by forming disinfection byproducts. The EPA believes there is sufficient association between DBPs and potential health hazards to warrant regulation. UV disinfection does not create BDP's and unlike chlorine, UV is not reliant on water temperature and pH.
UV disinfection eliminates the need to generate, handle, transport, or store toxic/hazardous or corrosive chemicals and requires less space than other methods. Also, UV leaves no residual effect that can be harmful to humans or aquatic life and it's also safer for plant operators.
Closed Vessel UV Disinfection offers significant advantages
The earliest UV systems, open channel systems, utilized racks of lamps immersed into an open channel. These open, gravity flow channels suffer from many disadvantages; poor hydraulic mixing, very large footprint, expensive to build, difficult to maintain and are vulnerable to fluctuations in flow rate.
Closed vessel ETS-UV disinfection systems are easy to install within existing pipework and new construction does not require the large footprint of concrete channels. Disinfection into a closed pipe will ensure optimized hydraulics and prevent the operator for exposure to the wastewater and UV light. Read more about why closed vessel disinfection systems are replacing open channel.
ETS-UV™ systems are validated by a 3rd party per NWRI Reuse Guidelines, through a bioassay which rigorously tests the UV system under a wide range of water quality conditions to identify system performance and enable accurate sizing and performance guarantees. ETS-UV systems are designed with sophisticated UV monitoring and controls to ensure consistent effective performance and an automatic wiping system to keep quartz clean to prevent lamp fouling.