Cited by 191CO2 Sequestration and Geologic InteractionsWaste Management and Environmental ImpactCoal and Its By-products

Carbonation of brine impacted fractionated coal fly ash: Implications for CO2 sequestration

Nyambura, Muriithi Grace, Mugera, Gitari Wilson, Felicia, Petrik Leslie, Gathura, Ndungu Patrick·2011·Journal of Environmental Management

Abstract

Coal combustion by-products such as fly ash (FA), brine and CO(2) from coal fired power plants have the potential to impact negatively on the environment. FA and brine can contaminate the soil, surface and ground water through leaching of toxic elements present in their matrices while CO(2) has been identified as a green house gas that contributes significantly towards the global warming effect. Reaction of CO(2) with FA/brine slurry can potentially provide a viable route for CO(2) sequestration via formation of mineral carbonates. Fractionated FA has varying amounts of CaO which not only increases the brine pH but can also be converted into an environmentally benign calcite. Carbonation efficiency of fractionated and brine impacted FA was investigated in this study. Controlled carbonation reactions were carried out in a reactor set-up to evaluate the effect of fractionation on the carbonation efficiency of FA. Chemical and mineralogical characteristics of fresh and carbonated ash were evaluated using XRF, SEM, and XRD. Brine effluents were characterized using ICP-MS and IC. A factorial experimental approach was employed in testing the variables. The 20-150 μm size fraction was observed to have the highest CO(2) sequestration potential of 71.84 kg of CO(2) per ton of FA while the >150 μm particles had the lowest potential of 36.47 kg of CO(2) per ton of FA. Carbonation using brine resulted in higher degree of calcite formation compared to the ultra-pure water carbonated residues.

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Crossref · 10.1016/j.jenvman.2010.10.008

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Authors
Nyambura, M. G., Mugera, G. W., Felicia, P. L., & Gathura, N. P.
Affiliations
University of Venda (ZA)
Venue
Journal of Environmental Management
Publisher
Elsevier BV
Published
2011-03
Volume
92
Issue
3
Pages
655-664
ISSN
0301-4797 (ISSN-L)
OpenAlex
W2014615938
Cited by
191
References
17
Citations by year
2026: 15 · 2025: 19 · 2024: 17 · 2023: 10 · 2022: 14 · 2021: 7 · 2020: 12 · 2019: 12 · 2018: 11 · 2017: 9 · 2016: 10 · 2015: 12 · 2014: 14 · 2013: 14 · 2012: 10
FWCI
8.92
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Environmental Management (publishedVersion)
  • PubMed (publishedVersion)
  • UWC Research Repository (University of the Western Cape) (submittedVersion)
Funders
Sasol
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Engineering › Mechanical Engineering › Waste Management and Environmental Impact
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Coal and Its By-products
Keywords
coal fly ash, brine, CO2 sequestration, carbonation, fractionation, calcite formation, CO2 mineralization, particle size, coal combustion by-products, groundwater contamination, leaching, CO2 capture
MeSH terms
Calcium Carbonate, Carbon, Carbon Dioxide, Coal, Microscopy, Electron, Scanning, Sodium Chloride, X-Ray Diffraction, Particulate Matter, Coal Ash

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