Water Disinfection: UV Irradiation--Poster Presentation

Abstract

Disinfection is a component of an ALS closed-loop water recycling and purification system for long-term space missions. A proposed means of disinfection involves primary disinfection by ultraviolet (UV) radiation and residual (secondary) disinfection by iodine. The effectiveness of UV disinfection is governed by the UV dose to which microorganisms are exposed. The UV dose is defined as the product of UV radiation intensity and exposure time (I?t). In a continuous-flow system, microorganisms will experience a broad range of local radiation intensities and exposure times; therefore, these systems will deliver a distribution of doses. The ability to accurately estimate the dose distribution delivered by an operating UV system is a critical aspect of its design. For this research, the flow field and particle trajectories in a UV reactor were simulated using computational fluid dynamics (CFD). The UV radiation intensity field was computed using a numerical method known as line-source integration (LSI). The outputs from the CFD and LSI simulations were then integrated to estimate the dose distribution delivered by the disinfection system. 1 slide Related Documents:WM1, WM2, WM3, WM