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A variable feed rate mechanism for fluidized bed asbestos generators.

R G Sussman, J M Gearhart, M Lippmann

    American Industrial Hygiene Association Journal
    |January 1, 1985
    PubMed
    Summary
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    A novel, inexpensive dust feed mechanism effectively generates stable asbestos aerosols for inhalation studies. This system allows for adjustable concentrations and rapid equilibration, ideal for prolonged animal exposures.

    Area of Science:

    • Environmental Health
    • Occupational Safety
    • Aerosol Science

    Background:

    • Accurate asbestos aerosol generation is crucial for toxicological studies.
    • Existing methods may lack simplicity, cost-effectiveness, or stability.
    • Controlled asbestos exposure is vital for understanding health risks.

    Purpose of the Study:

    • To design and evaluate a simple, inexpensive dust feed mechanism for a fluidized bed generator (FBG).
    • To assess the mechanism's capability in generating stable asbestos aerosols.
    • To determine the system's performance in maintaining consistent aerosol concentrations for extended periods.

    Main Methods:

    • Development of a low-cost dust feed mechanism integrated with a two-phase fluidized bed generator.
    • Utilizing the system to generate asbestos aerosols.

    Related Experiment Videos

  • Monitoring aerosol concentration and stability within an inhalation chamber over time.
  • Evaluating the system's adjustability and equilibration speed.

    • Main Results:

    • A steady-state concentration of asbestos aerosol (39.1 fibers/cc > 5 microns length +/- 6.2%) was maintained for five hours.
    • The FBG output concentration was easily adjusted.
    • The system achieved rapid equilibration within 10 minutes.
    • The mechanism proved effective for generating aerosols of other dusts as well.

    Conclusions:

    • The developed dust feed mechanism is a simple, inexpensive, and effective tool for generating asbestos aerosols.
    • This system offers reliable and stable aerosol concentrations suitable for long-duration animal inhalation studies.
    • The technology is adaptable for generating various types of dust aerosols.