Biogas production from the landfilled easily degradable fraction of municipal solid waste: mining strategy for energy recovery

Abstract

The growing demand for space and financial resources to manage current and new municipal solid waste (MSW) landfills has become a massive challenge for several countries. Additionally, landfills contribute to adverse environmental impacts such as pollution and CO 2 (carbon dioxide) and CH 4 (methane) emissions. This paper has analyzed the possibility of producing biogas from landfilled MSW. An easily degradable fraction of landfilled MSW with 8 years of landfilling was mined and subjected to chemical characterization and elemental composition analysis. The abbreviation for the study sample was called ED8 – Mined. The low values of lignin (24.5%) and nitrogen content (0.7%) and high values of holocellulose (75.9%) and C/N (46.1%) on dry basis were obtained resulting in materials with the potential to be used for biogas generation. Recalcitrant materials were found in greater amounts than easily biodegradable fresh MSW fractions. The reuse of energy from landfilled MSW can contribute positively to the country’s environment and economy, reducing environmental liabilities and generating energy in a controlled way. In Delta A Sanitary Landfill, Southeastern Brazil, the recovery of the ED8 – Mined would reflect a significant recovery of about 100,000 tonnes of landfilled materials for annual MSW cells of about 450,000 tonnes, allowing recovery of materials and space expansion for rejects. Graphical abstract fx1

Greenhouse gas emissions by the biogas from the Abandoned Solid Waste Final Disposal Site in City of Veracruz, Mexico

“…With the data obtained from the Table 6, the generation of tons of greenhouse gases (CO2, CH4 and N2O) is calculated from the year 2000 and up to 2031 (Table 7) The generation of GHG were plotted according to the results obtained at Table 7 (Figure 5) for the years 2000 to 2031, although the generation continues for more than 50 years, due to persistent degradation of de organic fraction of waste [26]. However, the Mexican Biogas Model does not establish a change in the composition of biogas, which does occur given that previous studies have shown that methane can represent up to 65 % of emissions and that over time this fraction will diminishing to almost disappearing [27].…”