Numerical Modeling of Flows in Ultraviolet Disinfection Channels

by D. A. Lyn, (A.M.ASCE),



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract: Current design methods for UV disinfection facilities depend largely on experience with minimum input design variables, such as water UV transmittance and required disinfection efficiency. The required disinfection efficiency, commonly referred to as log removal, is determined by target effluent quality (i.e., the regulatory effluent limit) and the expected microorganism concentration in influent water. These design variable are then compared to experience from similar UV installations to determine the required TJV dosage. Better understanding of the impacts of these system variables on the UV intensity within the UV reactor, and hence system performance, will result in more adequate and efficient designs. Minor and major alarms are provided for UV system controls. The minor alarm is activated due to either single lamp failure or indication of lamp fouling. (The lamp fouling is indicated by an intensity probe within each UV lamp bank.) Major alarms include high turbidity, low UV transmittance, multiple lamp failuree (5 percent of the total number of lamps), and adjacent lamp failure. This paper establishes some practical design guidelines for UV disinfection facilities.

Subject Headings: Ultraviolet radiation | Light (artificial) | Building design | Failure analysis | Water conservation | Effluents | Water quality

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