NDLI: Heavy metals leaching in bottom ash and fly ash fractions from industrial-scale BFB-boiler for environmental risks assessment

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Heavy metals leaching in bottom ash and fly ash fractions from industrial-scale BFB-boiler for environmental risks assessment

Content Provider	Semantic Scholar
Author	Pöykiö, Risto Mäkelä, Mikko Watkins, Gary R. Nurmesniemi, Hannu Dahl, Olli
Copyright Year	2016
Abstract	Abstract The bottom ash and fly ash from the co-combustion of wood residues and peat at a bubbling fluidised bed boiler (296 MW) contained only quartz (SiO 2 ), microcline (KAlSi 3 O 8 ) and albite (NaAlSi 3 O 8 ). Thus, X-ray powder diffraction (XRD) was not useful for clarifying the difference in the release of associated heavy metals from ash matrices. In order to assess the release of heavy metals from ashes under changing environmental conditions, they were sequentially extracted and fractionated by the BCR-procedure into acid soluble/exchangeable (CH 3 COOH), reducible (NH 2 OH–HCl) and oxidizable (H 2 O 2 /CH 3 COONH 4 ) phases. The CH 3 COOH extractable fraction in conjunction with the total heavy metals concentrations were used to calculate the risk assessment code values for heavy metals leaching from the ash matrix. The leaching studies indicate that the heavy metals in the bottom ash and fly ash are bound to different fractions with different strengths. From the environmental and utilization perspectives, heavy metals in ashes posed different levels of environmental contamination risk. Only As in the bottom ash posed a very high risk. High risk metals were Cd in the bottom ash as well as As, Cd and Se in the fly ash.
Starting Page	256
Ending Page	264
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1016/S1003-6326(16)64112-2
Volume Number	26
Alternate Webpage(s)	http://www.ysxbcn.com/down/2016/01_en/28-p0256.pdf
Alternate Webpage(s)	https://doi.org/10.1016/S1003-6326%2816%2964112-2
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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