Mote cleaner system PM2.5 emission factors and rates for cotton gins: Method 201A combination PM10 and PM2.5 sizing cyclones

Authors: Whitelock, Derek; BUSER, MICHAEL - Oklahoma State University; Boykin Jr, James; Holt, Gregory

Submitted to: Journal of Cotton Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/21/2013
Publication Date: 12/30/2013
Publication URL: http://handle.nal.usda.gov/10113/5394141
Citation: Whitelock, D.P., Buser, M.D., Boykin Jr, J.C., Holt, G.A. 2013. Mote cleaner system PM2.5 emission factors and rates for cotton gins: Method 201A combination PM10 and PM2.5 sizing cyclones. Journal of Cotton Science. 17(4):457-467.

Interpretive Summary: In 2006, the US Environmental Protection Agency implemented a more stringent air quality standard for very fine dust smaller than 2.5 micrometers in diameter. All cotton gins will eventually be impacted by this standard. The primary issue affecting the cotton industry across the country is that cotton gins may not be regulated fairly, because very little scientifically sound information is available on cotton gin emissions of this very fine dust. In response, seven cotton gins at locations across the Cotton Belt were sampled by the three USDA-ARS Cotton Ginning Laboratories and Oklahoma State University to determine the amount of very fine dust emitted while processing cotton. One of the seven gins had a mote cleaner system that was not combined with other major systems. It was found that the mote cleaner system at the gin sampled emitted on average 0.008 pounds of the fine dust for every 500-pound bale of cotton produced, which was about 5% of the total dust emitted from the system. This information provides previously unavailable estimates for fine dust emissions from cotton gins and, thus, will ensure that cotton gins are appropriately permitted and accounted for in state and federal regulations. Furthermore, this may allowing many gins to avoid installing additional dust control measures with substantially higher capital and operating costs that will impact the ginning cost to the farmer.

Technical Abstract: This report is part of a project to characterize cotton gin emissions from the standpoint of stack sampling. In 2006, EPA finalized and 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 current EPA AP-42 cotton gin PM2.5 emission factors did not exist. The objective of this study was the development of PM2.5 emission factors for cotton gin mote cleaner systems based on the EPA-approved stack sampling methodology, Method 201A. The project plan included sampling seven cotton gins across the Cotton Belt. This information is repeated in the body of the text and this detail can be left out in the abstract shortening it some. Some test runs were excluded from the test averages because they failed to meet EPA Method 201A Test criteria. Also, other test runs, included in the analyses, had cotton lint fibers that collected in the = 10 µm and/or = 2.5 µm samples. This larger lint material can impact the reported emissions data, but EPA Method 201A does not suggest methods to account for these anomalies. Average measured mote cleaner system PM2.5 and total particulate emission factors for the stand-alone mote cleaner system were 0.0036 kg/227-kg bale (0.0079 lb/500-lb bale) and 0.065 kg/bale (0.14 lb/bale). The average total particulate emission factor for the stand-alone mote cleaner system was lower than those currently published in EPA AP- 42 for similar systems. The ratio of mote cleaner system PM2.5 to total particulate was 5.5%. Average measured PM2.5 emission factors for the mote cleaner system combined with the module feeder dust system was 0.022 kg/bale (0.050 lb/bale).