Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants
The leachability and speciation of inorganic trace contaminants of oxy-coal combustion fly ash from a 20 MWth oxy-pulverized coal combustion (oxy-PCC) demonstration plant have been evaluated. Collected oxy-coal fly ashes show significant differences in their particle size distribution (PSD) and chemical composition as a result of the oxy-fuel combustion operating conditions. While the variation of the PSD in the oxy-coal fly ash can be considered as indicative of the formation of ultrafine particles by the enhanced oxygen concentration, the differences in the chemical composition are attributed to the recirculation of the accumulated CO 2 -rich flue gas back to the boiler with high impurities of inorganic trace contaminants. Evaluation of the leaching results and the waste acceptance criteria at landfills reveals that all oxy-coal fly ashes (oxy-FAs) can be accepted at nonhazardous waste landfills. However, the leachable concentration of Zn, As, Mo, Cd, and Sb are well above the inert range in the oxy-FAs and that of Cr, Mo, and Se are the upper inert range and close to nonhazardous in some oxy-coal fly ash leachates. Consequently, the potential risk of contaminating the oxy-coal fly ash with excessive amounts of trace contaminants can be very critical to the configuration of an oxy-fuel combustion power plant at full-scale. © 2019 American Chemical Society.
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American Chemical Society
2019-03-29
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Subjects: | Coal, Coal combustion, |
Online Access: | http://hdl.handle.net/10261/204864 http://dx.doi.org/10.13039/501100003329 |
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dig-idaea-es-10261-2048642020-03-29T04:30:37Z Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants Córdoba, Patricia Diego, Ruth Ministerio de Economía y Competitividad (España) Córdoba, Patricia [0000-0003-0596-4354] Coal Coal combustion The leachability and speciation of inorganic trace contaminants of oxy-coal combustion fly ash from a 20 MWth oxy-pulverized coal combustion (oxy-PCC) demonstration plant have been evaluated. Collected oxy-coal fly ashes show significant differences in their particle size distribution (PSD) and chemical composition as a result of the oxy-fuel combustion operating conditions. While the variation of the PSD in the oxy-coal fly ash can be considered as indicative of the formation of ultrafine particles by the enhanced oxygen concentration, the differences in the chemical composition are attributed to the recirculation of the accumulated CO 2 -rich flue gas back to the boiler with high impurities of inorganic trace contaminants. Evaluation of the leaching results and the waste acceptance criteria at landfills reveals that all oxy-coal fly ashes (oxy-FAs) can be accepted at nonhazardous waste landfills. However, the leachable concentration of Zn, As, Mo, Cd, and Sb are well above the inert range in the oxy-FAs and that of Cr, Mo, and Se are the upper inert range and close to nonhazardous in some oxy-coal fly ash leachates. Consequently, the potential risk of contaminating the oxy-coal fly ash with excessive amounts of trace contaminants can be very critical to the configuration of an oxy-fuel combustion power plant at full-scale. © 2019 American Chemical Society. We would like to thank the staff of Fundacioń Ciudad de la Energia (CIUDEN) for their support, help, and kind assistance during and after the sampling campaigns. The corresponding author also gratefully acknowledges the Spanish Ministerio de Economia,́ Industria y Competitividad, for awarding P.C. with the Postdoctoral Fellowship Juan de la Cierva (IJCI-2016-2755) and to the Institute of Environmental Assessment and Water Research, Spanish National Research Council (IDÆA-CSIC). Peer reviewed 2020-03-23T17:32:06Z 2020-03-23T17:32:06Z 2019-03-29 artículo http://purl.org/coar/resource_type/c_6501 nergy and Fuels 33 (5): 4531-4541 (2019) http://hdl.handle.net/10261/204864 10.1021/acs.energyfuels.8b04164 http://dx.doi.org/10.13039/501100003329 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/IJCI-2016-2755 Postprint https://doi.org/10.1021/acs.energyfuels.8b04164 Sí open American Chemical Society |
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Coal Coal combustion Coal Coal combustion Córdoba, Patricia Diego, Ruth Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
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The leachability and speciation of inorganic trace contaminants of oxy-coal combustion fly ash from a 20 MWth oxy-pulverized coal combustion (oxy-PCC) demonstration plant have been evaluated. Collected oxy-coal fly ashes show significant differences in their particle size distribution (PSD) and chemical composition as a result of the oxy-fuel combustion operating conditions. While the variation of the PSD in the oxy-coal fly ash can be considered as indicative of the formation of ultrafine particles by the enhanced oxygen concentration, the differences in the chemical composition are attributed to the recirculation of the accumulated CO 2 -rich flue gas back to the boiler with high impurities of inorganic trace contaminants. Evaluation of the leaching results and the waste acceptance criteria at landfills reveals that all oxy-coal fly ashes (oxy-FAs) can be accepted at nonhazardous waste landfills. However, the leachable concentration of Zn, As, Mo, Cd, and Sb are well above the inert range in the oxy-FAs and that of Cr, Mo, and Se are the upper inert range and close to nonhazardous in some oxy-coal fly ash leachates. Consequently, the potential risk of contaminating the oxy-coal fly ash with excessive amounts of trace contaminants can be very critical to the configuration of an oxy-fuel combustion power plant at full-scale. © 2019 American Chemical Society. |
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Ministerio de Economía y Competitividad (España) |
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Ministerio de Economía y Competitividad (España) Córdoba, Patricia Diego, Ruth |
format |
artículo |
topic_facet |
Coal Coal combustion |
author |
Córdoba, Patricia Diego, Ruth |
author_sort |
Córdoba, Patricia |
title |
Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
title_short |
Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
title_full |
Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
title_fullStr |
Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
title_full_unstemmed |
Oxy-Coal Combustion Fly Ashes: Leachability of Inorganic Trace Contaminants |
title_sort |
oxy-coal combustion fly ashes: leachability of inorganic trace contaminants |
publisher |
American Chemical Society |
publishDate |
2019-03-29 |
url |
http://hdl.handle.net/10261/204864 http://dx.doi.org/10.13039/501100003329 |
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AT cordobapatricia oxycoalcombustionflyashesleachabilityofinorganictracecontaminants AT diegoruth oxycoalcombustionflyashesleachabilityofinorganictracecontaminants |
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