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Emerging Technologies Disinfection updated 2012 March 2013 Technology Summary Microwave Ultraviolet (UV) Disinfection Objective: State of Development: Precipitation and recovery of phosphorus as a Adaptive Use. usable product. Description: UV disinfection transfers electromagnetic energy from a mercury arc lamp to wastewater. Electromagnetic radiation, between the ranges of 100 to 400 nm (UV range), penetrates bacterial cells, and works as a bactericide. Typical mercury vapor UV lamps contain electrodes that facilitate the generation of UV radiation by striking an electric arc. These electrodes are delicate and their deterioration is the primary source of failure in UV disinfection systems. Microwave UV disinfection technology eliminates the need for electrodes by using microwave-powered, electrodeless, mercury UV lamps. In this technology, microwave energy is generated by magnetrons and directed through wave guides into quartz lamp sleeves containing argon gas. The directed microwave energy excites the argon atoms, which in turn excite the mercury atoms to produce radiation as they return from excited states to lower energy states, as is the case with other mercury UV lamps. Electrode- less lamps operate at low pressure, which reduces safety risks and increases lamp life. Microwave UV lamps allow greater flexibility for variations in parameters such as lamp diameter, operating pressures, and fill materials because of the absence of electrodes. This allows for greater optimization of radiation at specific wavelength regions. The intensity of the radiation increases when the applied microwave power is increased. Microwave UV disinfection systems are available in modular, open-channel, and closed-vessel designs. Comparison to Established Technologies: Microwave UV disinfection systems use low-pressure, high-output electrodeless lamps to optimize UV output at 254 nm (the same wavelength targeted by standard UV disinfection systems). The electrodeless lamps warm up quickly and are capable of disinfection within 12 seconds compared to startup times of 20 seconds to 3 minutes for electrode lamps. Eliminating the electrode from the lamp eliminates the primary deterioration process associated with UV lamps, resulting in a lamp life approximately three times that of electrode lamps. Lamp aging, the phenomenon by which the output of UV lamps steadily decreases with lamp age is not a factor with microwave UV lamps. The lamp has a very low residual radiation of energy, thus almost instant shutoff capability, which prevents overheating heat-sensitive materials near the lamps. The improved warm up and shutoff response capability provide additional opportunity for effective flow pacing control to match UV dose to operating conditions in real time. This reduces energy consumption without reducing lamp life. Radiation is produced through the entire length of the lamp, and no energy loss occurs as is associated with electrodes. The electrodeless lamp system has more components than the conventional electrode system, including the magnetron, wave guides, and cooling fans. Magnetron life is limited and requires replacement. Magnetrons usually are warranted for up to 10,000 hours of operation. Lamps are typically warranted for 3 years. Available Cost Information: Approximate Capital Cost: Not disclosed by the vendor. Approximate O&M Costs: Not disclosed by the vendor. Vendor Name(s): Severn Trent Services – Microdynamics 3000 Advance Ln Colmar, PA 18915 Telephone: 215-997-4000 Fax: 215-997-4062 Email: info@severntrentservices.com Web site: www.severntrentservices.com Installation(s): Blairsville WWTP, PA Dow Chemicals, TX Kent County, DE Kingsport WWTP, TN Leacock WWTP, PA Mandeville WWTP, LA Montevallo WWTP, AL Mt. Signal WWTP, Seeley County, CA 2-20 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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