Record Display for the EPA National Library Catalog


Main Title Trajectory of Aerosol Droplets from a Sprayed Bacterial Suspension.
Author Lighthart, B. ; Shaffer, B. T. ; Marthi, B. ; Ganio, L. ;
CORP Author Corvallis Environmental Research Lab., OR. ;ManTech Environmental Technology, Inc., Corvallis, OR.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/146;
Stock Number PB91-219048
Additional Subjects Bacillus subtilis ; Aerosols ; Bacterial spores ; Particle size ; Spatial distribution ; Altitudes ; Wind ; Mathematical models ; Reprints ; Aeroplankton
Library Call Number Additional Info Location Last
NTIS  PB91-219048 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Simulated droplet trajectories of a polydispersed microbial aerosol in a laminar air flow regimen were compared with observed dispersal patterns of aerosolized Bacillus subtilis subsp. niger spores in quasilaminar airflow. Simulated dispersal patterns could be explained in terms of initial droplet sizes and whether the droplets evaporated to residual aeroplanktonic size before settling to the ground. For droplets that evaported prior to settling out, a vertical downwind size fractionation is predicted in which the microbial residue of the smallest droplets settles the least, and is found in the airstream at about sprayer height, and progressively larger droplet residues settle to progressively lower heights. Observations of spore particle size distributions downwind from a spray source support the simulation. As predicted by the simulation, the aerosol settled and progressed downwind, with the number of small droplets and particles increasing in proportion to the height and distance downwind.