A bench-scale, landfill flare system was designed and built to test the potential for heat-resistant spores to survive the flaring process and enter the environment. The residence times and temperatures of the flare were characterized and compared to full-scale systems. Experiments were conducted using Geobacillus stearothermophilus and Bacillus atrophaeus spores as surrogates for Bacillus anthracis. Spore solutions were aerosolized, dried, and sent through the bench-scale system. Sampling was conducted downstream of the flare using a bioaerosol collection device. The samples were cultured, incubated for seven days, and assessed for viability.
Results showed that the bench-scale, landfill flare system was comparable to a full-scale combustor flare with a single-orifice diffusion burner. All spores of G. stearothermophilus and B. atrophaeus were inactivated in the bench-scale system, suggesting that spores that pass through the flare in a full-scale system will become inactivated as well.
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|Advisor:||Leith, David, Rosati, Jacky A.|
|Commitee:||Leith, David, Rosati, Jacky A., Stewart, Jill R.|
|School:||The University of North Carolina at Chapel Hill|
|Department:||Environmental Sciences & Engineering|
|School Location:||United States -- North Carolina|
|Source:||MAI 50/01M, Masters Abstracts International|
|Subjects:||Microbiology, Environmental Health, Environmental engineering|
|Keywords:||Bacillus anthracis, Bacillus atrophaeus, Geobacillus stearothermophilus, Landfills|
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