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ARS Home » Plains Area » Las Cruces, New Mexico » Cotton Ginning Research » Research » Publications at this Location » Publication #315990
Title: Particle size distribution characteristics of cotton gin second stage mote system total particulate emissions

Author
item BUSER, MICHAEL - Oklahoma State University
item Whitelock, Derek
item BOYKIN, J - Retired ARS Employee
item Holt, Gregory

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 second stage mote system total particulate emissions. National Cotton Gin Technical Reports. Report #OSU13-11. Available: http://buser.okstate.edu/air-quality/cotton-gin/technical-reports/

Interpretive Summary:

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, EPA AP-42 included combined 1st and 2nd stage mote system PM10 (particulate matter with nominal diameter less than or equal to 10 µm) and total particulate emission factors and not individual mote system emission factors. The objective of this study was to characterize particulate emissions for 2nd stage mote 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 five gins (15 total test runs) were 0.00030 kg/227-kg bale (0.00067 lb/500-lb bale), 0.0039 kg/bale (0.0087 lb/bale), and 0.0036 kg/bale (0.0080 lb/bale), respectively. The 2nd stage mote system particle size distributions were characterized by an average mass median diameter of 16.06 µm (aerodynamic equivalent diameter) and a geometric standard deviation of 4.19. Based on system average emission factors, the ratio of PM2.5 to total particulate was 2.9%, PM2.5 to PM10 was 7.7%, PM10 to total was 37%, and PM10-2.5 to total was 34%. Particle size distribution based system average PM2.5 and PM10 emission factors were 12% and 49% of those measured for this project utilizing EPA-approved methods. The particle sized distribution based PM10 emission factor was 6.7% of that currently published in EPA AP-42 for the mote fan which is equivalent to a combined 1st and 2nd stage mote system.