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Formation of Polychlorinated Dibenzofurans and Dioxins during Combustion, Electrical Equipment Fires and Pcb Incineration

By Choudhry, Ghulam Ghaus

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Book Id: WPLBN0000240333
Format Type: PDF eBook
File Size: 0.4 MB
Reproduction Date: 2005

Title: Formation of Polychlorinated Dibenzofurans and Dioxins during Combustion, Electrical Equipment Fires and Pcb Incineration  
Author: Choudhry, Ghulam Ghaus
Volume:
Language: English
Subject: Government publications, United Nations., United Nations. Office for Disarmament Affairs
Collections: Government Library Collection, Disarmament Documents
Historic
Publication Date:
Publisher: United Nations- Office for Disarmament Affairs (Unoda)

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Choudhry, G. G. (n.d.). Formation of Polychlorinated Dibenzofurans and Dioxins during Combustion, Electrical Equipment Fires and Pcb Incineration. Retrieved from http://worldebooklibrary.com/


Description
Government Reference Publication

Excerpt
Excerpt: Polychlorinated dibenzo-pdiaxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are likely formed by thermal synthesis of a variety of primary precursors. Highest levels of these compounds are expected, however, when the starting material requires only one or two reaction steps for their formation, as is the case with chlorophenols, chlorobenzenes and polychlorirated biphenyls (PCBs). Laboratory pyrolyses have indeed shown that PCBs give significant yields of PCDFs, and chlorobenzenes give both PCDFs and PCDDs. In addition, a variety of other chloroaromatic compounds are formed. From these experiments and from accidents involving PCB fires, it is known that PCDFs are the mast important toxic compounds associated with PCBs. .\lost rommercil I3(.Hs contain I(I)F> in the Ion ppm ranw. 1YI)F runwntratia,n dovs nut inrreasv duriny nrrnoaple ration in rlrctrical equipment. .%ccident. (tires atnd erplurion., i n v l r nICg1 1s ran give 1CI)F lrvels in soot of up to IlllNl ppm and higher. Effertive thermal de.rlrurlit,n of ICIi is pussihle in modern incineration units, provided high temperatures, excess air and sufficient residence times are used. Exact figures for minimum temperature and residence time cannot be given, since feedstock and incinerator construction greatly influence destruction efficiency. Effluents from EPA-licensed incinerators used for PCB destruction contain only very low levels of PCDDs and PCDFs.

 

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