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 412315
Title Scrubber capabilities to remove airborne microorganisms and other aerial pollutants from the exhaust air of animal houses
Author(s) Aarnink, A.J.A.; Landman, W.J.M.; Melse, R.W.; Zhao, Y.; Ploegaert, J.P.M.; Huynh, T.T.T.
Source Transactions of the ASABE / American Society of Agricultural and Biological Engineers 54 (2011)5. - ISSN 2151-0032 - p. 1921 - 1930.
Department(s) LR - Backoffice
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) henrys law constant - operations - water - acid
Abstract Two studies were conducted to assess the efficiency of air scrubbers to reduce airborne microorganisms in the exhaust air from animal houses. First, in a field study, the effects of a bio-scrubber and an acid scrubber on total bacterial counts were assessed. Higher bacterial counts were found in the outlet air compared to the inlet air of a bio-scrubber (increase from 6.1 × 104 to 2.4 × 105 CFU m-3), while an acid scrubber with sulfuric acid reduced bacterial emissions from 2.7 × 105 to 8.4 × 104 CFU m-3. Second, in a laboratory study, the effects of three disinfectants, added to the circulating water of an experimental air scrubber, on reductions of bacteria and virus were tested and compared with the effect of using only water. The air to the scrubber was extracted from four isolators each harboring seven roosters. Enterococcus faecalis and Gumboro vaccine virus were aerosolized in the air of one of the isolators. Hydrogen peroxide (H2O2; 0.6%), peracetic acid (CH3CO3H; a solution of 0.13% acetic acid, 0.6% peroxide, and 0.13% peracetic acid), or ozone (O3; 0.015%) were used as disinfectants. Peracetic acid was the only disinfectant that reduced bacteria and virus concentrations to below the sampler detection limits. We conclude that an acid scrubber with sulfuric acid is very useful at reducing ammonia emissions to the atmosphere but cannot significantly prevent emissions of microorganisms. Peracetic acid has a high potential to reduce these emissions and could replace or supplement sulfuric acid in existing scrubbers during periods of high risk of disease outbreak.
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