Comparison of CO2 capture by ex-situ accelerated carbonation and in in-situ naturally weathered coal fly ash

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dc.contributor.authorMuriithi, Grace N.
dc.contributor.authorPetrik, Leslie
dc.contributor.authorFatoba, Olanrewaju O.
dc.contributor.authorM. Gitari, Wilson
dc.contributor.authorDoucet, Frederic J.
dc.contributor.authorNel, Jaco
dc.contributor.authorNyale, Sammy M.
dc.contributor.authorChuks, Paul E.
dc.date.accessioned2018-01-15T12:18:24Z
dc.date.available2018-01-15T12:18:24Z
dc.date.issued2013
dc.description.abstractNatural weathering at coal power plants ash dams occurs via processes such as carbonation, dissolution, co-precipitation and fluid transport mechanisms which are responsible for the long-term chemical, physical and geochemical changes in the ash. Very little information is available on the natural carbon capture potential of wet or dry ash dams. This study investigated the extent of carbon capture in a wet-dumped ash dam and the mineralogical changes promoting CO2 capture, comparing this natural phenomenon with accelerated ex-situ mineral carbonation of fresh fly ash (FA). Significant levels of trace elements of Sr, Ba and Zr were present in both fresh and weathered ash. However Nb, Y, Sr, Th and Ba were found to be enriched in weathered ash compared to fresh ash. Mineralogically, fresh ash is made up of quartz, mullite, hematite, magnetite and lime while weathered and carbonated ashes contained additional phases such as calcite and aragonite. Up to 6.5 wt % CO2 was captured by the fresh FA with a 60% conversion of calcium to CaCO3 via accelerated carbonation (carried out at 2 h, 4Mpa, 90 o C, bulk ash and a S/L ratio of 1). On the other hand 6.8 wt % CO2 was found to have been captured by natural carbonation over a period of 20 years of wet disposed ash. Thus natural carbonation in the ash dumps is significant and may be effective in capturing CO2.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationMuriithi, G.N. et al. (2013). Comparison of CO2 capture by ex-situ accelerated carbonation and in-situ naturally weathered coal fly ash. Journal of Environmental management, 127: 212 – 220en_US
dc.identifier.issn0301-4797
dc.identifier.urihttp://dx.doi.org/10.1016/j.jenvman.2013.05.027
dc.identifier.urihttp://hdl.handle.net/10566/3390
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherElsevieren_US
dc.rightsThis is the author-version of the article published online at: http://dx.doi.org/10.1016/j.jenvman.2013.05.027
dc.status.ispeerreviewedTRUE
dc.subjectAsh damen_US
dc.subjectFly ashen_US
dc.subjectWeathered ashen_US
dc.subjectEx-situ mineral carbonationen_US
dc.subjectCO2 captureen_US
dc.titleComparison of CO2 capture by ex-situ accelerated carbonation and in in-situ naturally weathered coal fly ashen_US
dc.typeArticleen_US

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