Land ll is an important anthropogenic source of greenhouse gases (GHG). Aiming at methane mitigation through the use of a cover layer in the form of fugitive emissions, this study investigated the methane passive bioxidation in a Brazilian land ll in bio lters under two conditions: control column (packing material using a 60 cm land ll cover soil with ≅0.8% organic matter) and enriched column (packing material using 45 cm land ll cover soil and 15 cm mixture of cover soil plus compost with ≅6% organic matter). The biogas was collected from a vertical drain pipe of a four-year-old cell and injected into the base of the columns with a high inlet loading (1000 g CH4 .m -².d -¹ at standard temperature and pressure conditions) in the upward ow mode. Ten campaigns were carried out for six months in order to determine the e ciency of the methane oxidation in each column. Parameters related to the biogas oxidation were also determined, such as soil temperature and moisture content and nutrients content in both lter beds. The oxidation global e ciencies were higher in the enriched column throughout all campaigns, with »71 and »95% for the control and enriched columns, respectively. Our study demonstrated that the use of substrates with high organic matter content and low cost (such as the compost) in land ll cover layers might present high e cacy in the reduction of methane fugitive emissions. Land ll is an important anthropogenic source of greenhouse gases (GHG). Aiming at methane mitigation through the use of a cover layer in the form of fugitive emissions, this study investigated the methane passive bio-oxidation in a Brazilian land ll in bio lters under two conditions: control column (packing material using only land ll cover soil with ≅0.8% organic matter) and enriched column (packing material using 45 cm land ll cover soil and 15 cm mixture of cover soil plus compost with ≅6% organic matter). Biogas was collected from a vertical drain pipe of a four-year-old cell and injected into the base of the columns with a high inlet loading (1000 gCH4.m-².d-¹) in upward ow mode. Ten campaigns were carried out for six months in order to determine the e ciency of the methane oxidation in each column. Soil temperature, moisture and nutrients content in both lter beds were also determined. The oxidation global e ciencies were higher in the enriched column throughout all campaigns, with »71 and »95% for the control and enriched columns, respectively, demonstrating that this technology can be applied even in land lls where there is no energy recovery from biogas (as in most land lls in developing countries). Our study demonstrated that the use of substrates with high organic matter content and low cost in land ll cover layers might present high e cacy in the reduction of methane fugitive emissions. Even operating in eld-scale conditions, the results of this study were comparable to those obtained with bio lters on lab-scale (under controlled operational conditions).
O lançamento do biogás gerado para atmosfera em aterros sanitários na forma de emissões fugitivas (pela camada de cobertura) é bastante representativo. Dado o elevado potencial do biogás como gás de efeito estufa (GEE), o estudo de diferentes tecnologias de seu aproveitamento para a produção de energia tem sido cada vez mais estudado. Além do aproveitamento do biogás, o emprego de biossistemas (biorrecobrimentos, biofiltros, etc.) em camadas de cobertura visando à otimização do consumo biótico de metano, principal componente do biogás em termos de potencial de aquecimento global, também tem sido amplamente avaliado como sistema complementar na mitigação de GEE. Desta forma, o presente estudo avaliou o desempenho, em termos de eficiência de oxidação de metano, de um biofiltro preenchido com solo convencional do aterro enriquecido com escuma de estação de tratamento de efluentes domésticos. Este biofiltro “melhorado”, com elevado teor de matéria orgânica (»4.5%) na porção superior do leito, foi comparado a um biofiltro “controle”, contendo apenas solo convencional do aterro e, portanto, com baixo teor de matéria orgânica (»0.5%). Ambos os biofiltros foram alimentados com carga de »44 gCH4.m-2.d-1 ao longo de nove campanhas de monitoramento. Parâmetros como concentração de metano no biogás bruto, umidade e temperatura dos leitos biofiltrantes também foram relacionados às eficiências de oxidação de metano. A eficiência média de oxidação de metano no biofiltro melhorado foi de 95.2%, comparativamente ao biofiltro controle (84.7% de eficiência), ratificando a eficácia de escuma de ETE como agregado do solo de camada de cobertura na mitigação de GEE.
Landfill is an important anthropogenic source of greenhouse gases (GHG). Aiming at methane mitigation through the use of a cover layer in the form of fugitive emissions, this study investigated the methane passive bioxidation in a Brazilian landfill in biofilters under two conditions: control column (packing material using a 60 cm landfill cover soil with ≅0.8% organic matter) and enriched column (packing material using 45 cm landfill cover soil and 15 cm mixture of cover soil plus compost with ≅6% organic matter). The biogas was collected from a vertical drain pipe of a four-year-old cell and injected into the base of the columns with a high inlet loading (1000 g CH4 .m - ².d - ¹ at standard temperature and pressure conditions) in the upward flow mode. Ten campaigns were carried out for six months in order to determine the efficiency of the methane oxidation in each column. Parameters related to the biogas oxidation were also determined, such as soil temperature and moisture content and nutrients content in both filter beds. The oxidation global efficiencies were higher in the enriched column throughout all campaigns, with »71 and »95% for the control and enriched columns, respectively. Our study demonstrated that the use of substrates with high organic matter content and low cost (such as the compost) in landfill cover layers might present high efficacy in the reduction of methane fugitive emissions. Landfill is an important anthropogenic source of greenhouse gases (GHG). Aiming at methane mitigation through the use of a cover layer in the form of fugitive emissions, this study investigated the methane passive bio-oxidation in a Brazilian landfill in biofilters under two conditions: control column (packing material using only landfill cover soil with ≅0.8% organic matter) and enriched column (packing material using 45 cm landfill cover soil and 15 cm mixture of cover soil plus compost with ≅6% organic matter). Biogas was collected from a vertical drain pipe of a four-year-old cell and injected into the base of the columns with a high inlet loading (1000 gCH4.m-².d-¹) in upward flow mode. Ten campaigns were carried out for six months in order to determine the efficiency of the methane oxidation in each column. Soil temperature, moisture and nutrients content in both filter beds were also determined. The oxidation global efficiencies were higher in the enriched column throughout all campaigns, with »71 and »95% for the control and enriched columns, respectively, demonstrating that this technology can be applied even in landfills where there is no energy recovery from biogas (as in most landfills in developing countries). Our study demonstrated that the use of substrates with high organic matter content and low cost in landfill cover layers might present high efficacy in the reduction of methane fugitive emissions. Even operating in field-scale conditions, the results of this study were comparable to those obtained with biofilters on lab-scale (under controlled operational conditions).
Biofilters have been recognized as key technology in the mitigation of greenhouse gases (GHG) emitted by landfills. This study aimed to evaluate the methane (an important GHG) oxidation efficiencies of two experimental biofilters at the municipal landfill of Guarapuava (Brazil) under normal conditions (control column), just using landfill cover soil with low organic matter content, and improved, exploiting dried scum from municipal wastewater treatment plant (SWWTP) mixed with the cover soil (enriched column, with a high organic matter content). The influence of parameters such as the methane inlet loading rates (22 and 44 gCH4.m− 2.d− 1), temperatures, methane concentration in the raw biogas, carbon/nitrogen ratio and moisture content of the packing materials on the oxidation of methane was also evaluated during 25 campaigns. The campaigns with the lowest methane loading rates applied to the biofilters showed the best methane oxidation efficiencies (98.4% and 89.5% in the enriched and control columns, respectively) as compared to campaigns with a higher load (92.6% and 82.6% in the enriched and control columns, respectively). In addition to the loading rates, the methane oxidation efficiencies were highly influenced by the organic matter content and C/N ratio of the packing materials evaluated.
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