Dechlorination/hydrogenation and destruction reactions of PCDDs in OCDD-added fly ash heated under vacuum

Chemosphere
Youhei MisakaKosuke Shobatake

Abstract

Octachlorodibenzo-p-dioxin (OCDD)-added, pretreated fly ash was heated under vacuum at sample temperatures ranging from T(s)=450 to 650 K. The fly ash and liquid nitrogen-cooled trap samples were analyzed for DD/DF through OCDD/DF. The total amounts of DD through OCDD decrease with increasing T(s), which indicates that dechlorination/hydrogenation (DCH) reactions are not the only reaction channels. Reduction of toxic equivalent (TEQ) for PCDDs by more than 99% was achieved in the fly ash by the vacuum heat treatment at T(s)=650 K for 4 h. The total amount of PCDDs and DD detected in the liquid nitrogen-cooled trap relative to that of added OCDD was about 17%, i.e., PCDDs and DD which were adsorbed to the fly ash surfaces can evaporate into the gaseous phase. The difference between the evaporation behavior of PCDDs in the present and the previous studies is discussed in the light of their states of existence.

References

Apr 29, 2004·Environmental Science & Technology·Jina ChoiByung Jin Mhin
Dec 31, 2005·Chemosphere·Youhei MisakaKosuke Shobatake
Dec 1, 1983·Environmental Science & Technology·W M Shaub, W Tsang

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Citations

Apr 18, 2009·Journal of Hazardous Materials·Martha CoboConsuelo Montes de Correa
Apr 22, 2009·Journal of Hazardous Materials·Xingbao GaoXiao Liu
Dec 12, 2012·The Science of the Total Environment·Ngo Thi ThuanMoo Been Chang
Apr 30, 2016·Environmental Science and Pollution Research International·Xingbao GaoQifei Huang
Dec 3, 2016·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Xingbao GaoXuemei Zhu

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