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<p>Landfill final cover soils play a vital role in mitigating landfilled waste-derived methane emissions by functioning as barriers between the waste mass and the atmosphere. However, assessing their effectiveness, particularly in semi-arid climates, remains a challenge due to unique weather conditions. This study investigates the aspects influencing methane emissions through the final cover of a full-scale landfill cell (106&#xa0;m × 118&#xa0;m footprint, 18&#xa0;m height) in the Brazilian semi-arid region during 450–480&#xa0;days post-closure. A multi-level methane monitoring scheme was employed via: (1) in-depth measurements by 9 LFG vents, (2) soil-waste&#xa0;interface monitoring, and (3) surface emissions quantified by static flux chambers at 22 spots. Geotechnical and physical chemical soil parameters from these spots were also analyzed concurrently. The methane profiles were obtained, and the performance of the cover layer was evaluated. Less than 6% of the methane produced within the waste mass is escaping from the cover soil to the atmosphere (30 Nm<sup>3</sup>/h from the in-depth level and 1.66 Nm<sup>3</sup>/h from the cover soil). Such low surface methane emissions were probably due to the absence of gas pressure under the cover layer, the high degree of compaction of the cover soil (&gt; 90%), which might have counterbalanced the effects of the air permeability-inducing low degrees of saturation (&lt; 50%), and the relatively favourable physicochemical conditions for methane oxidation in the cover soil (pH = 7.5–9.2).</p>

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Aspects influencing methane emissions through the final cover soil of a landfill in the Brazilian semi-arid region

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Maria Josicleide Felipe Guedes,
  • Francisco Gleson dos Santos Moreira,
  • Jeovana Jisla das Neves Santos,
  • Raul Batista Araujo de Sousa,
  • Márcio Camargo de Melo,
  • Veruschka Escarião Dessoles Monteiro

摘要

Landfill final cover soils play a vital role in mitigating landfilled waste-derived methane emissions by functioning as barriers between the waste mass and the atmosphere. However, assessing their effectiveness, particularly in semi-arid climates, remains a challenge due to unique weather conditions. This study investigates the aspects influencing methane emissions through the final cover of a full-scale landfill cell (106 m × 118 m footprint, 18 m height) in the Brazilian semi-arid region during 450–480 days post-closure. A multi-level methane monitoring scheme was employed via: (1) in-depth measurements by 9 LFG vents, (2) soil-waste interface monitoring, and (3) surface emissions quantified by static flux chambers at 22 spots. Geotechnical and physical chemical soil parameters from these spots were also analyzed concurrently. The methane profiles were obtained, and the performance of the cover layer was evaluated. Less than 6% of the methane produced within the waste mass is escaping from the cover soil to the atmosphere (30 Nm3/h from the in-depth level and 1.66 Nm3/h from the cover soil). Such low surface methane emissions were probably due to the absence of gas pressure under the cover layer, the high degree of compaction of the cover soil (> 90%), which might have counterbalanced the effects of the air permeability-inducing low degrees of saturation (< 50%), and the relatively favourable physicochemical conditions for methane oxidation in the cover soil (pH = 7.5–9.2).