Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Ventilation control to reduce airborne contaminants.

Authors
O'Shaughnessy-PT; Thome-PS; Donham-KJ; Smith-TF; Hoff-SJ
Source
NIOSH 2002 Mar; :1-10
Link
NIOSHTIC No.
20023514
Abstract
Studies have shown conclusively that airborne contaminant levels in swine confinements are typically of a sufficient level to pose a health hazard to workers in that occupation. In addition to a particulate component that can reach levels of 26 mg/m3, gases present in confinements in high amounts include methane, hydrogen sulfide, ammonia, and carbon dioxide. Recognized respiratory diseases of swine farmers include upper airway inflammation, an asthma-like syndrome, and chronic airflow limitations. Ventilation systems associated with swine confinements are largely designed to provide a comfortable climate for the pigs. However, because confinements are operated on a for-profit basis, costs associated with operating the ventilation system are typically kept to a minimum by minimizing fan usage, which results in maintaining high airborne contaminant levels. This research involved the analysis of continuous readings of two environmental parameters, temperature and relative humidity, and two air quality parameters, airborne dust and ammonia, relative to measurements taken by standard sampling methods. Results indicated a relatively good correlation between the real-time temperature and humidity recordings and standard sampling methods but low correlation between sensor-based dust and ammonia measurements and those taken by standard method. Therefore, the use of these monitors as direct-reading instruments for feedback control of airflow rates to mitigate concentration levels is suspect. Robust sensors that are easily calibrated and capable of withstanding the harsh environment of a swine confinement are needed. To simulate the effect of airflow on environmental and quality control parameters, computer software capable of simulating dynamic processes was utilized. The resulting model output was compared and validated with the real-time measurements taken on site with results showing a close agreement between the two. Development of models ofthis sort show promise in accurately determining the effect of ventilation through a room or building on the resulting indoor air quality expressed in terms of environmental conditions or airborne hazards.
Keywords
Control-technology; Agricultural-workers; Agriculture; Air-contamination; Air-flow; Air-quality-measurement; Air-sampling; Air-sampling-equipment; Analytical-methods; Animal-husbandry; Animal-husbandry-workers; Respiratory-system-disorders; Ventilation; Ventilation-systems; Temperature-effects; Gases
CAS No.
74-82-8; 7783-06-4; 7664-41-7; 124-38-9
Publication Date
20020321
Document Type
Final Grant Report
Funding Amount
162000
Funding Type
Grant
Fiscal Year
2002
NTIS Accession No.
PB2003-107713
NTIS Price
A03
Identifying No.
Grant-Number-K01-OH-000176
NIOSH Division
OEP
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
National Institute for Occupational Safety and Health
State
IA
Performing Organization
Department of Occupational and Environmental Health, Institute for Rural and Environmental Health,The University of Iowa, Iowa City, Iowa 52242
TOP