Pollutant emissions during pyrolysis and combustion of waste printed circuit boards, before and after metal removal

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Title: Pollutant emissions during pyrolysis and combustion of waste printed circuit boards, before and after metal removal
Authors: Ortuño García, Nuria | Conesa, Juan A. | Moltó Berenguer, Julia | Font, Rafael
Research Group/s: Residuos, Pirólisis y Combustión
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Keywords: Printed circuit board | WEEE | Pyrolysis | Combustion | Dioxin
Knowledge Area: Ingeniería Química
Issue Date: 15-Nov-2014
Publisher: Elsevier
Citation: Science of The Total Environment. 2014, 499: 27-35. doi:10.1016/j.scitotenv.2014.08.039
Abstract: The constant increase in the production of electronic devices implies the need for an appropriate management of a growing number of waste electrical and electronic equipment. Thermal treatments represent an interesting alternative to recycle this kind of waste, but particular attention has to be paid to the potential emissions of toxic by-products. In this study, the emissions from thermal degradation of printed circuit boards (with and without metals) have been studied using a laboratory scale reactor, under oxidizing and inert atmosphere at 600 and 850 °C. Apart from carbon oxides, HBr was the main decomposition product, followed by high amounts of methane, ethylene, propylene, phenol and benzene. The maximum formation of PAHs was found in pyrolysis at 850 °C, naphthalene being the most abundant. High levels of 2-, 4-, 2,4-, 2,6- and 2,4,6-bromophenols were found, especially at 600 °C. Emissions of PCDD/Fs and dioxin-like PCBs were quite low and much lower than that of PBDD/Fs, due to the higher bromine content of the samples. Combustion at 600 °C was the run with the highest PBDD/F formation: the total content of eleven 2,3,7,8-substituted congeners (tetra- through heptaBDD/Fs) was 7240 and 3250 ng WHO2005-TEQ/kg sample, corresponding to the sample with and without metals, respectively.
Sponsor: Support for this work was provided by the CTQ2013-41006 project from the Ministry of Education and Science (Spain) and the PROMETEO/2009/043/FEDER project from the Valencian Community Government (Spain).
URI: http://hdl.handle.net/10045/44587
ISSN: 0048-9697 (Print) | 1879-1026 (Internet)
DOI: 10.1016/j.scitotenv.2014.08.039
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.scitotenv.2014.08.039
Appears in Collections:INV - REMAN - Artículos de Revistas

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