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Thermodynamic conditions for the reduction of dioxins during combustion of the organic parts contained in electronic wastes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1999 (English)In: REWAS '99: Global Symposium on Recycling, Waste Treatment and Clean Technology ; proceedings of the "REWAS'99: Global Symposium on Recycling, Waste Treatment and Clean Technology", held in San Sebastián, Spain, September 5 - 9, 1999 ; TMS Fall 1999 Extraction and Process Metallurgy Meeting / [ed] I. Gaballah, 1999, 937-648 p.Conference paper (Refereed)
Abstract [en]

Electric and Electronic scrap contains about 30% plastics which are treated with halogenated flame retardants. During the combustion of these wastes, halogenated flame retardants can produce dibenzo-p-dioxins and dibenzo-furans. Their reduction can be performed by optimization of combustion parameters e.g. temperature in the combustion chamber, concentration of oxygen, temperature of flue gas at exit, residence time in the cooler, and HCl and H2O mixed in secondary air. The thermodynamic calculations show that, with an oxygen content of 0.1 mole, the total amount of dioxins/furans starts to reduce at 700°C and no formation of these isomers can be observed at 1000°C. However, these molecules are formed even at high temperature and the influence of chlorine on their reduction is negligible with an oxygen content of 1E-5 mole. On the other hand, the presence of SO2 in the gas mixture minimizes the dioxin emissions and the high concentration of water reduces the ratio of dioxins and furans in a given system

Place, publisher, year, edition, pages
1999. 937-648 p.
Research subject
Process Metallurgy
URN: urn:nbn:se:ltu:diva-37018ScopusID: 33488711Local ID: ae461b30-fcc1-11dc-a946-000ea68e967bOAI: diva2:1010516
Global Symposium on Recycling, Waste Treatment and Clean Technology : 05/09/1999 - 09/09/1999
Godkänd; 1999; 20080328 (cira)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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