Characterization and alternative use study of fly ash

Adeoti, Ibraheem Adetunji (2011) Characterization and alternative use study of fly ash. Masters thesis, Memorial University of Newfoundland.

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In the generation of power from fossil fuels and biomass, fly ash (FA) is produced and represents both an environmental and economic cost with respect to disposal. However, it also represents a re-use opportunity. Increasing solid waste disposal costs and a focus on sustainable processing necessitates research in alternative uses for fly ash. In this thesis, two ash samples, hog-boiler precipitate ash sample (HBP) and mixed ash pond sample (MAP) from the AV-cell pulp and paper plant were examined for their chemical, physical, thermal, and mineralogical properties. Other physio-chemical properties like density, pH and buffering power were also determined. -- Characterization results were used to determine and test alternative uses for FA. Result shows that the samples are rich source of alum inosilicate, SiO₂, CaO, and Al₂O₃ which are feedstock for adsorption and zeolite synthesis. The concentration of SiO₂ to Al₂O₃ is greater than 1.5 therefore indicating good potential for zeolite synthesis. The FAs pH was between 10.0 and 13.0 with buffering power ranges from 0.5 to 4.9 mmol/pH, as such, were tested for acid mine drainage (AMD) neutralization. Treated effluent water final pH was between 9.0 and 12.2 with contaminant removal efficiency of 85%. Neutralization residue was treated hydrothermally and resulted in an increased adsorption properties zeolite, tested for AMD treatment and yielded above 90% contaminant removal efficiency. The total chemical species (SiO₂ + Al₂O₃ + CaCO₃ + CaO + Na₂O + K₂O + MgO Fe₂O₃) is greater than 90 wt.% hence, the FAs were tested for permeable reactive barriers (PRB) application and its contaminant removal efficiency was also greater than 90% with final treated effluent water pH ranges between 8.4 and 12.2. -- Overall, AMD treatment with FA provides a low cost, environmentally safe and beneficial use of what would be considered a waste.

Item Type: Thesis (Masters)
Item ID: 10055
Additional Information: Includes bibliographical references (leaves 120-129).
Department(s): Engineering and Applied Science, Faculty of
Date: 2011
Date Type: Submission
Library of Congress Subject Heading: Fly ash--Recycling; Acid mine drainage--Purification; Neutralization (Chemistry); Zeolites--Synthesis.

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