Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 442221
Title Inactivation of airborne Enterococcus faecalis and infectious bursal disease virus using a pilot-scale ultraviolet photocatalytic oxidation scrubber
Author(s) Zhao, Y.; Aarnink, A.J.A.; Xin, H.
Source Journal of the Air & Waste Management Association 64 (2014)1. - ISSN 1096-2247
DOI http://dx.doi.org/10.1080/10962247.2013.831800
Department(s) LR - Environment
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) upper-room air - germicidal irradiation - bacteria - microorganisms - uv - immunosuppression - mycobacteria - efficiencies - methodology - bioaerosols
Abstract High microbial concentrations and emissions associated with livestock houses raise health and environmental concerns. A pilot-scale ultraviolet photocatalytic (UV-PCO) scrubber was tested for its efficacy to inactivate aerosolized Enterococcus faecalis and infectious bursal disease virus (IBDV). Microbial reduction was determined by the difference in microbial concentrations measured in the upstream and downstream isolators that were connected to the two ends of the UV-PCO scrubber. Two UV irradiance levels were tested by using one or two UV lamps. The theoretical UV irradiances were 6,595 µW cm-2 with one UV lamp, and 12,799 µW cm-2 with two UV lamps. At the tested ventilation rate (70 m3 h-1), the contact time was 1 sec. Reduction rate and other two indexes (k-value and Z-value) that normalized UV radiation were calculated to describe the extent of microbial inactivation. The UV-PCO scrubber eliminated > 99.7% of airborne E. faecalis from the incoming airstream under one UV lamp irradiance, and the reduction was further increased by 0.2 – 0.3% when the second UV lamp was added. The reduction rate for airborne IBDV was 72.4% with one UV lamp. The calculated k-values were 0.501 – 0.594 cm2 mJ-1 for airborne E. faecalis and 0.217 cm2 mJ-1 for IBDV. The Z-value of airborne E. faecalis to UV irradiance was 9 (± 1.6)¿×¿10-4 cm2 µW-1 s-1. Results indicate that UV-PCO scrubber can serve as an effective and efficient technology for inactivating airborne bacteria and virus. The up-scaling of the pilot-scale scrubber for field use will require considerations such as design air-treatment capacity, UV irradiance level, contact time, dust concentration, susceptibility of target microorganism, and expected reduction rate.
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