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Emerging Technologies March 2013 Disinfection prepared 2012 Technology Summary Automated Channel Routing for UV Disinfection Objective: State of Development: Reduce energy use and extend UV lamp life for UV Emerging. disinfection systems. Description: Automation can reduce the number of lamps and/or channels operating based on real-time flow and wastewater characteristic data. Controls can be designed to turn off lamps or divert flow to a few operating channels depending on the UV system design. Control is most commonly flow-paced control or dose-paced control. Flow-paced is the simplest with number of lamps/channels in service based strictly on influent flow rate. Dose-paced control is based on the calculated dose, which is derived from flow rate, UV transmittance (UVT) and lamp power (including lamp age and on-line intensity output) data (Leong et al. 2008). During periods of high solids removal, UVT will increase and UV output can be decreased to achieve the same dose. During wet weather events or other periods of low effluent quality, lamp output can be increased in response to reduced UVT. Comparison to Established Technologies: At the University of California, Davis Wastewater Treatment Plant, process controls were implemented to divert flow automatically to one of two channels during low flow conditions (Phillips and Fan 2005). This change provided the flexibility to operate at 33, 50, 67 and 100 percent of maximum power. The original design limited operation to 67 and 100 percent of maximum power. The annual energy use at the UC Davis WWTP is expected to decrease by 25 percent once the process changes are fully implemented in the fall of 2010. Available Cost Information: Information not available. Vendor Name(s): Information not available. Key Words for Internet Search: Installation(s): University of California, Davis Wastewater Treatment Plant Mike Fan, Superintendent Waste Water Treatment and Solid Waste Telephone: 530-752-7553 Email: mmfan@ucdavis.edu UV disinfection, automated channel routing, energy efficient UV control. Data Sources: Leong, L.Y.C., J. Kuo, and C Tang. 2008. Disinfection of Wastewater Effluent— Comparison of Alternative Technologies. Water Environment Research Foundation (WERF), Alexandria, VA. Phillips, D. L. and M. M. Fan. 2005. Automated Channel Routing to Reduce Energy Use in Wastewater UV Disinfection Systems. University of California, Davis. Davis, California. USEPA (2010) Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities. Office of Water. EPA 832-R-10- 005 September 2010. http://water.epa.gov/scitech/wastetech/upload/Evaluation-of-Energy-Conservation-Measures-for-Wastewater- Treatment-Facilities.pdf 6-18 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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