|BUSER, MICHAEL - Oklahoma State University|
|BOYKIN, J - Retired ARS Employee|
Submitted to: World Wide Web
Publication Type: Other
Publication Acceptance Date: 3/31/2015
Publication Date: 3/31/2015
Citation: Buser, M.D., Whitelock, D.P., Boykin, J.C., Holt, G.A. 2015. Particle size distribution characteristics of cotton gin third stage seed-cotton cleaning system total particulate emissions. National Cotton Gin Technical Reports. Report #OSU13-04. Available: http://buser.okstate.edu/air-quality/cotton-gin/technical-reports/
Technical Abstract: This report is part of a project to characterize cotton gin emissions from the standpoint of total particulate stack sampling and particle size analyses. In 2013, EPA published a more stringent standard for particulate matter with nominal diameter less than or equal to 2.5 µm (PM2.5). This created an urgent need to collect additional cotton gin emissions data to address current regulatory issues, because EPA AP-42 cotton gin PM2.5 emission factors did not exist. In addition, current EPA AP-42 emission factor quality ratings for cotton gin PM10 (particulate matter with nominal diameter less than or equal to 10 µm) data are questionable and extremely low. The objective of this study was to characterize particulate emissions for 3rd stage seedcotton cleaning systems from cotton gins located in regions across the cotton belt based on EPA-approved total particulate stack sampling methodologies and particle size analyses. Average measured PM2.5, PM10 and PM10-2.5 emission factors based on the mass and particle size analyses of EPA Method 17 total particulate filter and wash samples from two gins (5 total test runs) were 0.00090 kg/227-kg bale (0.0020 lb/500-lb bale), 0.012 kg/bale (0.027 lb/bale), and 0.011 kg/bale (0.025 lb/bale), respectively. The 3rd stage seed-cotton cleaning system particle size distributions were characterized by an average mass median diameter of 9.57 µm (aerodynamic equivalent diameter) and a geometric standard deviation of 3.10. Based on system average emission factors, the ratio of PM2.5 to total particulate was 3.8%, PM2.5 to PM10 was 7.5%, PM10 to total was 52%, and PM10-2.5 to total was 48%. Particle size distribution based system average PM2.5 and PM10 emission factors were 23% and 63% of those measured for this project utilizing EPA-approved methods. The particle sized distribution based PM10 emission factor was 81% of that currently published in EPA AP-42.