Measuring cattle feedlot dust using laser diffraction analysis

H. B. Gonzales, R. G. Maghirang, J. D. Wilson, E. B. Razote, L. Guo

Research output: Contribution to journalArticlepeer-review

Abstract

Considerable amounts of particulate matter (PM), including total suspended particulates (TSP), particulates with equivalent aerodynamic diameter less than or equal to 10 μm (PM 10), and particulates with equivalent aerodynamic diameter less than or equal to 2.5 μm (PM 2.5), are emitted from large beef cattle feedlots. Particle size distribution and concentrations of TSP, PM 10, and PM 2.5 at a commercial cattle feedlot in Kansas were measured over a two-year period. The feedlot had a capacity of 30,000 head with a total pen area of 50 ha and was equipped with a sprinkler system for dust control. Collocated low-volume samplers for TSP, PM 10, and PM 2.5 were used to measure concentrations of TSP, PM 10, and PM 2.5 at the upwind and downwind edges of the feedlot. A laser diffraction (LD) analyzer (Beckman Coulter LS 13 320) was utilized to determine the particle size distribution of dust samples collected by TSP samplers. A micro-orifice uniform deposit impactor (MOUDI) was also used to measure particle size distribution at the downwind edge of the feedlot. Considering the same effective size range, the LD analyzer and MOUDI did not differ significantly in mean geometric mean diameter (GMD) (11.6 vs. 13.0 μm) and in mean geometric standard deviation (2.3 vs. 2.3). Wind speed and period of sampling significantly affected the mean GMD of the particles. The PM 10 and PM 2.5 concentrations that were calculated from the LD method and TSP data were not significantly different from those measured by low-volume PM 10 and PM 2.5 samplers (122 vs. 131 μg m -3 for PM 10 and 26 vs. 35 μg m -3 for PM 2.5). Both PM 10 and PM 2.5 fractions decreased as pen surface water content increased, but the PM 2.5/PM 10 ratio showed little change as pen surface water content increased.

Original languageEnglish (US)
Pages (from-to)2319-2327
Number of pages9
JournalTransactions of the ASABE
Volume54
Issue number6
StatePublished - Nov 1 2011
Externally publishedYes

Keywords

  • Cattle feedlot
  • Geometric mean diameter
  • Laser diffraction
  • Particle size distribution

ASJC Scopus subject areas

  • Forestry
  • Food Science
  • Biomedical Engineering
  • Agronomy and Crop Science
  • Soil Science

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