Accession Number : ADA600934


Title :   Design Considerations for a Water Treatment System Utilizing Ultra-Violet Light Emitting Diodes


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Spencer, Michael J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a600934.pdf


Report Date : 27 Mar 2014


Pagination or Media Count : 75


Abstract : UV LED technology is in its infancy and research as it applies to UV water treatment is required to advance knowledge for practical application. This thesis focused on two subjects. First, the design, fabrication, and operation of a water treatment reaction system utilizing Ultra-Violet (UV) Light Emitting Diodes (LEDs). Second, the measurement of UV LED output angle in water which is necessary to support future reactor designs. Several characteristics of the LED-water interface were revealed which impacted the effectiveness of the vessel including; UV dose requirements, LED wavelength, photon dispersion geometry, LED placement, optical efficiency, vessel material, and electronic control system. The reactor vessel design balanced optimal characteristics with experiment design flexibility, fabrication speed, and procurement considerations. Expeditious construction was required to permit laboratory exploration performed by other researchers studying bacterial spore disinfection, an advanced oxidation process, and UV LED output wavelength and intensity observations. Two reactor vessels and three electronic boards were completed and modified as the research matured. Next, the UV LED output angle in air and water was measured. The conclusions of the literature review, practical application, and output angle calculations led to future design considerations for a UV LED, water reaction vessel, and electronic control system.


Descriptors :   *DISINFECTION , *LIGHT EMITTING DIODES , *ULTRAVIOLET RADIATION , *WATER TREATMENT , COMPUTATIONAL FLUID DYNAMICS , FABRICATION , THESES , WATER FLOW


Subject Categories : Electrooptical and Optoelectronic Devices
      Optics
      Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE