Distribution of Particle and Gas Concentrations in Swine Gestation Confined Animal Feeding Operations

Details

• Alternative Title:
  Ann Occup Hyg
• Personal Author:
  Peters, Thomas M ; Anthony, T. Renée ; Taylor, Craig ; Altmaier, Ralph ; Anderson, Kimberley ; O’Shaughnessy, Patrick T
• Description:
  Objectives
  
  Dust mass concentrations, temperatures, and carbon dioxide concentrations were mapped in a modern, 1048-pen swine gestation barn in winter, spring, and summer.
  
  Methods
  
  In each season, two technicians measured respirable mass concentrations with an aerosol photometer and temperatures and carbon dioxide concentrations with an indoor air quality monitor at 60 positions in the barn. Stationary photometers were also deployed to measure mass concentrations during mapping at five fixed locations.
  
  Results
  
  In winter when building ventilation rates were low (center–barn mean air velocity = 0.34 m s−1, 68 fpm) to conserve heat within the barn, mass and carbon dioxide concentrations were highest (mass geometric mean, GM = 0.50mg m−3; CO2 GM = 2060 ppm) and fairly uniform over space (mass geometric standard deviation, GSD = 1.48; CO2 GSD = 1.24). Concentrations were lowest in summer (mass GM = 0.13mg m−3; CO2 GM = 610 ppm) when ventilation rates were high (center–barn mean air velocity = 0.99 m s−1, 196 fpm) to provide cooling. Spatial gradients were greatest in spring (mass GSD = 2.11; CO2 GSD = 1.50) with low concentrations observed near the building intake, increasing to higher concentrations at the building exhaust.
  
  Conclusions
  
  Mass concentrations obtained in mapping were generally consistent with those obtained from stationary monitors. A moderately strong linear relationship (R2 = 0.60) was observed between the log of photometer-measured mass concentration and the log of carbon dioxide concentration, suggesting that carbon dioxide may be an inexpensive alternative to assessing air quality in a swine barn. These results indicate that ventilation can effectively reduce contaminant levels in addition to controlling temperature.
  
  
• Subjects:
  Agriculture Air Pollutants, Occupational Air Pollution, Indoor Animal Feed Animal Husbandry Animals Carbon Dioxide Dust Female Humans Seasons Swine Ventilation

  More +
• Source:
  Ann Occup Hyg. 56(9):1080-1090.
• Pubmed ID:
  22904211
• Pubmed Central ID:
  PMC4777339
• Document Type:
  Journal Article
• Funding:
  U50 OH007548/OH/NIOSH CDC HHS/United States ; U50 OH007548-06/OH/NIOSH CDC HHS/United States
• Volume:
  56
• Issue:
  9
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:66f0e9724ea5d268b8136223d61ceede5bcaf983154dfbddd065a89bdbba84c1
• Download URL:
  https://stacks.cdc.gov/view/cdc/38337/cdc_38337_DS1.pdf
• File Type:
  [PDF - 971.03 KB ]