Evoqua has installed and commissioned two ETS-UV systems to support a “Living Greener” initiative of Rushville, Indiana.
Evoqua was chosen to supply two ETS-UV SW-1250-20 ultraviolet (UV) disinfection systems to complete the Rushville’s Combined Sewer Overflow (CSO) Long Term Control Plan.
This equipment will treat the plant’s wastewater and respond to CSO, which occur when flows grow beyond the hydraulic capacity of the combined stormwater and wastewater to the treatment plant.
Rushville’s plan intends to safeguard the Flatrock River by making a safe release of excess water through filtration and disinfection methods.
The traditional method to disinfect CSO water is chlorination; however, the adverse environmental impacts associated with the byproducts of chlorination has led to increasingly restrictive chlorine residual requirement. UV disinfection is an efficient, low cost and an environmentally friendly method to disinfect water. It is also safer for operators and the community given that it is a chemical free process that adds nothing to the water.
Further, UV disinfection method can inactivate pathogens such as Giardia and Cryptosporidium. Discharged wastewater contianing these pathogens can be hazardous for drinking water supplies and recreational water.
ETS-UV systems were chosen due to compact design, least number of components and unique product features. These systems are designed in a small footprint with an access hatch to remove flow disruptions and air pockets.
Further, the systems also come with low voltage automatic wipers to keep quartz sleeves clean that prevents fouling, thereby enabling the UV energy to penetrate the water. The fully automated system can respond to variable flow and water quality without wasting power.
Evoqua aquatics and disinfection research, development and engineering vice president Jon McClean said: “Applying UV disinfection technology is an environmentally friendly option for cities to meet the challenges associated with combined sewer overflow. The process protects wetlands, aquatic species and supports a healthy ecological habitat."
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