The Relationship between the Quantity of Heavy Metal and PAHs in Fly Ash

Abstract

Heavy metal and polycyclic aromatic hydrocarbons (PAHs) in flue gas have received considerable attention in recent years due to their mutagenic or carcinogenic properties. The present study is carried out to investigate the influence of the quantity of heavy metals on PAHs formation in fly ash. A fluidized bed incinerator was used in this experiment to obtain fly ash of chemical similarity by incinerating various compositions of waste. The obtained fly ash, both with and without heavy metal, were used to adsorb the PAHs in the flue gas and to investigate the formation of PAHs in fly ash. The results indicate that carbon and heavy metals most greatly influence the formation of PAHs in the fly ash. Carbon is absorptive; heavy metals encourage not only absorption of PAHs but also catalyze PAHs formation.

Evidence of global pollution and recent environmental change in Kamchatka, Russia

“…Rose and Juggins 1994;Fernandez et al 2002). Despite their size (typically 2 − 20 μm), their presence has been recorded in the sediments of many remote lakes in both northern and southern hemispheres (e.g., Bindler et al, 2001;Rose et al 2004; where they have proved useful in identifying anthropogenic influences while their large, and frequently porous, surface areas result in them being considered an important means by which toxic pollutants such as trace metals and persistent organic pollutants (Ghosh et al 2000;Wey et al 1998) may be atmospherically transported and deposited.…”

An assessment of the mechanisms for the transfer of lead and mercury from atmospherically contaminated organic soils to lake sediments with particular reference to Scotland, UK

“…Petersen et al, 1995;Seigneur et al, 2005) and POPs (e.g. Ohsaki et al, 1995;Wey et al, 1998;Ghosh et al, 2000;Persson et al, 2005) are known to bind to their surfaces and hence the erosive transfer of these particulate contaminants may further enhance metal and POPs inputs from soils to surface waters.…”

Effect of operating conditions on emission concentration of PAHs during fluidized bed air gasification of biomass

“…flowmeter, (7) thermocouple, (8) pressure detector, (9) preheater chamber, (10) sand bed, (11) electric resistance, (12) U manometer, (13) cyclone, (14) induced fan, (15) secondary fluidized bed.…”

“…Addition of Al 2 O 3 mixed with bed materials may lead a reducing of fluidized bed quality. Wey et al [13] showed the combustion efficiency of fluidized bed incinerator was influenced by adding CaO. Lin et al [14] indicated the fluidized behavior of a bimodal particle size tend to segregate and reduce combustion efficiency.…”