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Disinfection Utilizing an Innovative Microwave UV System

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The Kent County Regional Wastewater Treatment Facility is an award winning 16 million gallons per day (MGD) wastewater treatment plant located in Kent County Delaware. It has recently received the 2007 Clean Water Act Recognition Award for Operations Excellence in the Large Treatment category. It recently accepted one of the inaugural US EPA's Region III Environmental Achievement Award for its Environmental Health and Safety Management System (EHSMS). An objective of the EHSMS was to remove chlorine gas as its disinfection process. This offered significant environmental and health and safety benefits.

Ultraviolet (UV) disinfection produces no residual byproducts, does not require dechlorination before discharge to the nearby receiving stream, does not require additional regulatory requirements such as OSHA's PSM or the EPA's RMP, and does not need special handling and emergency response training. A Capstone project conducted by students of the University of Maryland Graduate School suggested UV as a cost effective treatment alternative.

Kershner Environmental Technologies offered an innovative UV solution, the Severn Trent Services MicroDynamics® microwave UV disinfection system. This UV system offered a number of advantages over traditional UV systems.

A 1 MGD pilot plant was tested during May 2008 and found to meet the permit limits of 33 colonies/100 ml of Enteroccocus. The unit was operated at 150% of its 1 MGD design flow capacity and was able to produce an effluent with a geometric mean of 3.5 colonies per 100 ml versus a permit limit of 33 colonies per ml. The full scale UV system will be capable of handling a normal flow of 12 MGD and peak of 18 MGD, a floating wieir is also being installed as part of the site work to balance flow to a maximum 18 MGD instead of the current 24 MGD maximum design flow, a 300 kW solar photovoltaic system will power the system. The system will be fully commissioned and operational by early 2010.

This paper will look at the experience of designing the system, and operating the pilot plant.

Keywords: Disinfection; UV Disinfection; Ultraviolet Disinfection

Document Type: Research Article


Publication date: 2009-01-01

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