Abstract
We developed, characterized, and tested a new dual-collimation aqueous UV reactor to improve the accuracy and consistency of aqueous k-value determinations. This new system is unique because it collimates UV energy from a single lamp in two opposite directions. The design provides two distinct advantages over traditional single-collimation systems: 1) realtime UV dose (fluence) determination; and 2) simple actinometric determination of the Reactor Factor (RF = 1.06) that relates measured irradiance levels to actual irradiance levels experienced by the microbial suspension. This RF replaces three of the four typical correction factors required for single-collimation reactors. Using this dual-collimation reactor, Bacillus subtilis spores demonstrated inactivation following the classic multi-hit model with k=0.1395 cm 2/mJ. Aspergillus niger spores exhibited two-stage decay with a shoulder, with the resistant fraction of the population (f) of 0.251, k 1=0.1968 cm2/mJ, k2=0.0426 cm2/mJ.
Original language | English (US) |
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Title of host publication | 10th International Conference on Healthy Buildings 2012 |
Pages | 322-327 |
Number of pages | 6 |
Volume | 1 |
State | Published - 2012 |
Event | 10th International Conference on Healthy Buildings 2012 - Brisbane, QLD, Australia Duration: Jul 8 2012 → Jul 12 2012 |
Other
Other | 10th International Conference on Healthy Buildings 2012 |
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Country/Territory | Australia |
City | Brisbane, QLD |
Period | 7/8/12 → 7/12/12 |
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering