Assessment of the dispersion of Legionella-containing aerosols from a biological treatment plant

Author
Blatny, Janet Martha
Tutkun, Murat
Fossum, Hannibal Eie
Skogan, Gunnar
Fykse, Else-Marie
Andreassen, Øyvind
Waagen, Viggo
Reif, Bjørn Anders Pettersson
Date Issued
2011
Permalink
http://hdl.handle.net/20.500.12242/711
https://publications.ffi.no/123456789/711
DOI
10.2741/e333
Collection
Articles
Description
Blatny, Janet Martha; Tutkun, Murat; Fossum, Hannibal Eie; Skogan, Gunnar; Fykse, Else-Marie; Andreassen, Øyvind; Waagen, Viggo; Reif, Bjørn Anders Pettersson. Assessment of the dispersion of Legionella-containing aerosols from a biological treatment plant. Frontiers in Bioscience 2011 ;Volum June.(1) s. 1300-1309
846102.pdf
Size: 1M
Abstract
Legionella was detected in aeration ponds (biological treatment plant) at Borregaard Ind. Ltd., Norway, and in air samples harvested directly above these ponds. Since 2005, three outbreaks of legionellosis occurred within a 10 km radius from this plant. This work addresses the dispersion patterns of Legionella-containing particles by characterizing the aerosol plume emitted from these ponds (outbreak source) < 500 meters using wind-tunnel measurements, CFD simulations, and real-life measurements. The most abundant particles directly over the ponds were < 6 and >15 ľm. The results showed that the aerosol plume remained narrow; 180 meters wide at 350 meters downwind of the ponds, and that 2 and 18 ľm aerosols were mainly deposited in the vicinity of the ponds ( 150 - 200 meters). Furthermore, the maximum aerosol concentration level appeared 5-10 meters above ground level and the maximum concentration 500 meters downwind was approximately 2% of the concentration level directly above the ponds. Our study demonstrates the strength of combining modeling with real-life aerosol analyses increasing the understanding of dispersion of airborne (pathogenic) microorganisms.
View Meta Data