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THE POTENTIAL OF COUPLING BIOLOGICAL AND CHEMICAL/PHYSICAL SYSTEMS FOR AIR POLLUTION CONTROL: A CASE STUDY IN THE RENDERING INDUSTRY
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 073-105 in Air Pollution from Agricultural Operations III, Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1403.(doi:10.13031/2013.15500)
Authors: J. R. Kastner and K. C. Das
The promulgation of “Odor Control Rules”, increasing public concerns, and EPA air regulations in non-attainment zones, necessitates the remediation of a wide range of volatile organic compounds (VOCs) generated in the rendering industry. Currently, wet scrubbers using oxidizing chemicals, such as chlorine dioxide or ClO2 and ozone (O3) are utilized to treat VOCs. However, little information is available on the type and concentration of VOCs emitted, and the effectiveness of current air pollution control technologies. In the first part of the project analytical methods were developed using GC/MS units for on-site analysis. Portable gas chromatography units with mass spectrometry detectors (GC/MS) were used to rapidly identify key odor causing compounds and volatile organic compounds in gas samples taken from several rendering plants. Major compounds consistently identified in the emissions from the plant included: methanethiol, octane, hexanal, 2-methylbutanal, and 3-methylbutanal. The two branched aldehydes, 2-methylbutanal and 3-methylbutanal, were by far the most consistent, appearing in every sample and typically the largest fraction of the VOC mixture. Total VOC concentrations in the inlet to high intensity scrubbers and a biofilter ranged from 4 to 90 ppmv.