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Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud

Authorized Users Only
2021
Authors
Smiciklas, Ivana
Jovic, Mihajlo
Jankovic, Marija
Smiljanic, Slavko
Onjia, Antonije
Article (Published version)
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Abstract
Acid mine drainage (AMD) remediation by red mud (RM) can benefit process sustainability and waste valorization. Though the AMD properties upon using RM have been broadly investigated, the key features and the environmental stability of spent RM are poorly defined. The current study aimed to compare the AMD neutralization and metal removal potential of the fresh (FRM) and aged (ARM) Bayer red mud and evaluate the textural, mineralogical, chemical, radiological properties of solid residues, and the stability of toxic elements. The FRM had larger particles and exhibited higher pH, iron oxide content, and radioactivity than ARM, which could be driven by ARM leaching and settling inside the tailings pond. FRM displayed marginally higher neutralization and metal removal capacity than ARM. Reaction with AMD led to partial dissolution of cancrinite minerals without significant changes in the particle size distribution. The leachability of investigated toxic elements (As, Ba, Cd, Cr, Cu, Ni, Pb..., Se, Zn) from neutralization residues complied with the limits set for inert waste by the EN 12457-2 test. Owing to the RM neutralization, the leachability of Al, As, Cr, and V decreased with respect to pristine samples. While Zn and Mn sorbed from AMD were stable following SPLP and EN 12457-2 tests, the sequential extraction revealed increased environmental availability, posing a potential risk during disposal or application if accompanied by a decline in pH. The slight increase in radioactivity upon RM neutralization indicates that changes in radionuclide inventory should be monitored when using RM in neutralization.

Keywords:
Red mud / Acid mine drainage / Toxic metals / Radionuclides / Leaching / Distribution
Source:
Water Air and Soil Pollution, 2021, 232, 12

DOI: 10.1007/s11270-021-05442-3

ISSN: 0049-6979

WoS: 000722854100001

Scopus: 2-s2.0-85119988573
[ Google Scholar ]
3
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4843
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Smiciklas, Ivana
AU  - Jovic, Mihajlo
AU  - Jankovic, Marija
AU  - Smiljanic, Slavko
AU  - Onjia, Antonije
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4843
AB  - Acid mine drainage (AMD) remediation by red mud (RM) can benefit process sustainability and waste valorization. Though the AMD properties upon using RM have been broadly investigated, the key features and the environmental stability of spent RM are poorly defined. The current study aimed to compare the AMD neutralization and metal removal potential of the fresh (FRM) and aged (ARM) Bayer red mud and evaluate the textural, mineralogical, chemical, radiological properties of solid residues, and the stability of toxic elements. The FRM had larger particles and exhibited higher pH, iron oxide content, and radioactivity than ARM, which could be driven by ARM leaching and settling inside the tailings pond. FRM displayed marginally higher neutralization and metal removal capacity than ARM. Reaction with AMD led to partial dissolution of cancrinite minerals without significant changes in the particle size distribution. The leachability of investigated toxic elements (As, Ba, Cd, Cr, Cu, Ni, Pb, Se, Zn) from neutralization residues complied with the limits set for inert waste by the EN 12457-2 test. Owing to the RM neutralization, the leachability of Al, As, Cr, and V decreased with respect to pristine samples. While Zn and Mn sorbed from AMD were stable following SPLP and EN 12457-2 tests, the sequential extraction revealed increased environmental availability, posing a potential risk during disposal or application if accompanied by a decline in pH. The slight increase in radioactivity upon RM neutralization indicates that changes in radionuclide inventory should be monitored when using RM in neutralization.
T2  - Water Air and Soil Pollution
T1  - Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud
IS  - 12
VL  - 232
DO  - 10.1007/s11270-021-05442-3
ER  - 
@article{
author = "Smiciklas, Ivana and Jovic, Mihajlo and Jankovic, Marija and Smiljanic, Slavko and Onjia, Antonije",
year = "2021",
abstract = "Acid mine drainage (AMD) remediation by red mud (RM) can benefit process sustainability and waste valorization. Though the AMD properties upon using RM have been broadly investigated, the key features and the environmental stability of spent RM are poorly defined. The current study aimed to compare the AMD neutralization and metal removal potential of the fresh (FRM) and aged (ARM) Bayer red mud and evaluate the textural, mineralogical, chemical, radiological properties of solid residues, and the stability of toxic elements. The FRM had larger particles and exhibited higher pH, iron oxide content, and radioactivity than ARM, which could be driven by ARM leaching and settling inside the tailings pond. FRM displayed marginally higher neutralization and metal removal capacity than ARM. Reaction with AMD led to partial dissolution of cancrinite minerals without significant changes in the particle size distribution. The leachability of investigated toxic elements (As, Ba, Cd, Cr, Cu, Ni, Pb, Se, Zn) from neutralization residues complied with the limits set for inert waste by the EN 12457-2 test. Owing to the RM neutralization, the leachability of Al, As, Cr, and V decreased with respect to pristine samples. While Zn and Mn sorbed from AMD were stable following SPLP and EN 12457-2 tests, the sequential extraction revealed increased environmental availability, posing a potential risk during disposal or application if accompanied by a decline in pH. The slight increase in radioactivity upon RM neutralization indicates that changes in radionuclide inventory should be monitored when using RM in neutralization.",
journal = "Water Air and Soil Pollution",
title = "Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud",
number = "12",
volume = "232",
doi = "10.1007/s11270-021-05442-3"
}
Smiciklas, I., Jovic, M., Jankovic, M., Smiljanic, S.,& Onjia, A.. (2021). Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud. in Water Air and Soil Pollution, 232(12).
https://doi.org/10.1007/s11270-021-05442-3
Smiciklas I, Jovic M, Jankovic M, Smiljanic S, Onjia A. Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud. in Water Air and Soil Pollution. 2021;232(12).
doi:10.1007/s11270-021-05442-3 .
Smiciklas, Ivana, Jovic, Mihajlo, Jankovic, Marija, Smiljanic, Slavko, Onjia, Antonije, "Environmental Safety Aspects of Solid Residues Resulting from Acid Mine Drainage Neutralization with Fresh and Aged Red Mud" in Water Air and Soil Pollution, 232, no. 12 (2021),
https://doi.org/10.1007/s11270-021-05442-3 . .

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