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<p>Sanitary landfills necessitate careful design and construction of liner systems to prevent leachate migration into surrounding areas. This study investigates the barrier performance of a geopolymer made from fly ash waste mixed with natural bentonite clay at ratios of 10% (FB1), 30% (FB3), and 50% (FB5) in ammonium (NH<sub>4</sub><sup>+</sup>) solution. The performance of the bottom liner application is characterized by adsorption, diffusion, and permeability. The results demonstrate that FB3 effectively represents the Langmuir model and exhibits the highest NH<sub>4</sub><sup>+</sup> uptake capacity, achieving a maximum adsorption capacity of 24.58&#xa0;mg/g. The diffusion coefficient of FB1–FB5 varies from 5.0 × 10<sup>–10</sup> m<sup>2</sup>/s to 1.0 × 10<sup>–9</sup> m<sup>2</sup>/s. The optimal 10% content meets the regulations for liner materials with a hydraulic conductivity of 8.46 × 10<sup>–10</sup>&#xa0;m/s&#xa0;in ammonium solution (1000 mg/L NH<sub>4</sub><sup>+</sup>-N); however, increasing bentonite clay beyond 30% raises hydraulic conductivity. Thus, these findings suggest that the proposed geopolymer made from bentonite clay and fly ash could serve as a promising liner material for NH<sub>4</sub><sup>+</sup> ions.</p>

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Adsorption, diffusion, and hydraulic performance of geopolymer from fly ash waste–bentonite clay in ammonium solution

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Ta Thi Hoai,
  • Toshifumi Mukunoki,
  • Kenji Shida,
  • Nguyen Thi Hai,
  • Nguyen Thi Hoang Ha,
  • Luu Viet Dung,
  • Do Trung Hieu

摘要

Sanitary landfills necessitate careful design and construction of liner systems to prevent leachate migration into surrounding areas. This study investigates the barrier performance of a geopolymer made from fly ash waste mixed with natural bentonite clay at ratios of 10% (FB1), 30% (FB3), and 50% (FB5) in ammonium (NH4+) solution. The performance of the bottom liner application is characterized by adsorption, diffusion, and permeability. The results demonstrate that FB3 effectively represents the Langmuir model and exhibits the highest NH4+ uptake capacity, achieving a maximum adsorption capacity of 24.58 mg/g. The diffusion coefficient of FB1–FB5 varies from 5.0 × 10–10 m2/s to 1.0 × 10–9 m2/s. The optimal 10% content meets the regulations for liner materials with a hydraulic conductivity of 8.46 × 10–10 m/s in ammonium solution (1000 mg/L NH4+-N); however, increasing bentonite clay beyond 30% raises hydraulic conductivity. Thus, these findings suggest that the proposed geopolymer made from bentonite clay and fly ash could serve as a promising liner material for NH4+ ions.