A survey study on arsenic speciation in coal fly ash and insights into the role of coal combustion conditions

Garcia, Estefania; Liu, Pan; Sanchez, Jose; Lee, Sungsik; Wang, Qian; Wen, Yinghao; Shivaprakash, Shaivan; Burns, Susan; Tang, Yuanzhi

doi:10.1016/j.apgeochem.2024.106095

A survey study on arsenic speciation in coal fly ash and insights into the role of coal combustion conditions

Journal Article · Fri Jul 05 00:00:00 EDT 2024 · Applied Geochemistry

DOI:https://doi.org/10.1016/j.apgeochem.2024.106095· OSTI ID:2565686

Garcia, Estefania ^[1]; Liu, Pan ^[1]; Sanchez, Jose ^[2]; Lee, Sungsik ^[3]; Wang, Qian ^[1]; Wen, Yinghao ^[1]; Shivaprakash, Shaivan ^[1]; Burns, Susan ^[1]; ^[1]

Georgia Institute of Technology, Atlanta, GA (United States)
Electric Power Research Inst. (EPRI), Palo Alto, CA (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)

Coal fly ashes (CFAs) are the low-density byproducts of the coal combustion process. Improper or uncontrolled CFA disposal poses significant environmental and health concerns due to the potential leaching of toxic heavy metals such as arsenic (As). Previous studies have investigated the content and speciation of As in different CFA samples, yet systematic information on As speciation in CFA with representative coal source and combustion conditions is still missing. Based on a recent survey study on the typical coal sources and combustion conditions across the U.S., this study selected 19 representative CFA samples to systematically investigate As speciation and potential correlations with these parameters. The composition, morphology, mineralogy, and As speciation of these CFA samples were characterized by complementary analytical, microscopic, and spectroscopic techniques. Synchrotron X-ray spectroscopy and microscopy analyses revealed the dominant As oxidation state to be As(V) and with strong associations to Ca, with the exception of 3 samples that had 19–51% As(III), likely due to the use of selective catalytic reduction (SCR) process. Principal component analysis was conducted to identify potential correlations of As concentration and oxidation state with parameters such as major element content, loss on ignition (LOI), average particle size, coal source, and combustion condition. Al₂O₃ and FeO content were found to capture a majority of the variability. Further, results from this study provide fundamental basis for understanding the correlations between coal source, combustion conditions, CFA characteristics, and As speciation, and providing insights for downstream beneficial utilization or disposal management.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC02-76SF00515; FE0031739; SC0012704

OSTI ID:: 2565686

Journal Information:: Applied Geochemistry, Journal Name: Applied Geochemistry Vol. 170; ISSN 0883-2927

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A survey study on arsenic speciation in coal fly ash and insights into the role of coal combustion conditions

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References (48)

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