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Document ID (ISN)66649
CIS number 96-743
ISSN - Serial title 1047-322X - Applied Occupational and Environmental Hygiene
Year 1994
Convention or series no.
Author(s) Juozaitis A., Huang Y.L., Willeke K., Donnelly J., Kalatoor S., Leeson A., Wyza R.
Title Dispersion of respirable aerosols in a fermenter and their removal in an exhaust system
Bibliographic information Aug. 1994, Vol.9, No.8, p.552-559. Illus. 28 ref.
Abstract To study the potential release of aerosols from a fermenter, a measurement system was developed to explore respirable aerosol formation characteristics and controllability. The data indicated that the majority of effluent aerosol particles released were in the submicrometer range. This includes bacteria and growth products. Particle concentration counts in the exhaust system increased by a factor of 100 during the fermentation process. This dramatic increase was shown to correlate with bacterial growth, foaming, and subsequent breaking of the uppermost foam layer into small droplets by the mechanical foam breaker. The ceramic filter in the exhaust system of the fermenter removed over 98% of the aerosol particles by count larger than 0.7Ám diameter, but up to 50% by count of the 0.1 to 0.3Ám particles were released into the ambient air. Thus, while the exhaust removes most of the particle mass, extremely small bacteria may escape to the environment.
Descriptors (primary) microorganisms; aerosols; determination in air; exhaust ventilation; inhalation toxicity; fermentation
Descriptors (secondary) bacteria; number concentration determination; particle size determination; fungi
Document type D - Periodical articles
Country / State or ProvinceLithuania; USA
Subject(s) Dust, aerosols and related diseases
Broad subject area(s) Chemical safety
Browse category(ies) Ventilation