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J Hazard Mater

Title:		Exhaust constituent emission factors of printed circuit board pyrolysis processes and its exhaust control
Author(s):		Chiang HL; Lin KH;
Address:		"Department of Health Risk Management, China Medical University, Taichung, Taiwan. Electronic address: hlchiang@mail.cmu.edu.tw. Department of Environmental Engineering and Science, Fooyin University, Kaohsiung, Taiwan"
Journal Title:		J Hazard Mater
Year:		2014
Volume:		20131030
Issue:
Page Number:		545 - 551
DOI:		10.1016/j.jhazmat.2013.10.049
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"The printed circuit board (PCB) is an important part of electrical and electronic equipment, and its disposal and the recovery of useful materials from waste PCBs (WPCBs) are key issues for waste electrical and electronic equipment. Waste PCB compositions and their pyrolysis characteristics were analyzed in this study. In addition, the volatile organic compound (VOC) exhaust was controlled by an iron-impregnated alumina oxide catalyst. Results indicated that carbon and oxygen were the dominant components (hundreds mg/g) of the raw materials, and other elements such as nitrogen, bromine, and copper were several decades mg/g. Exhaust constituents of CO, H2, CH4, CO2, and NOx, were 60-115, 0.4-4.0, 1.1-10, 30-95, and 0-0.7mg/g, corresponding to temperatures ranging from 200 to 500 degrees C. When the pyrolysis temperature was lower than 300 degrees C, aromatics and paraffins were the major species, contributing 90% of ozone precursor VOCs, and an increase in the pyrolysis temperature corresponded to a decrease in the fraction of aromatic emission factors. Methanol, ethylacetate, acetone, dichloromethane, tetrachloromethane and acrylonitrile were the main species of oxygenated and chlorinated VOCs. The emission factors of some brominated compounds, i.e., bromoform, bromophenol, and dibromophenol, were higher at temperatures over 400 degrees C. When VOC exhaust was flowed through the bed of Fe-impregnated Al2O3, the emission of ozone precursor VOCs could be reduced by 70-80%"
Keywords:		Air Pollution/*prevention & control Electronic Waste/*analysis Kinetics Recycling Thermogravimetry Volatile Organic Compounds/analysis Iron impregnated Al(2)O(3) Pyrolysis Volatile organic compounds Waste printed circuit board (WPCB);
Notes:		"MedlineChiang, Hung-Lung Lin, Kuo-Hsiung eng Netherlands 2013/11/19 J Hazard Mater. 2014 Jan 15; 264:545-51. doi: 10.1016/j.jhazmat.2013.10.049. Epub 2013 Oct 30"