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University of Regina (1998)

Landfill gas generation at a semi-arid landfill

Opseth, Douglas A.

Titre : Landfill gas generation at a semi-arid landfill

Auteur : Opseth, Douglas A.

Université de soutenance : University of Regina,

Grade : (M.Sc.) 1998.

This research was undertaken in order to characterize gas emissions fxom semi-arid landfills in Saskatchewan. The Saskatoon Landfill and the Regina Fleet Street Landfill were examined for greenhouse gas emissions and spatial emission variability. Waste sampling was also conducted at the Regina Fleet Street Landfill in order to help explain the emission results. The key findings were an average moisture content of 22%, and an average interna1 temperature of 17.3" . Both of these levels are significantly below what is deemed optimal for landfill gas generation. In addition to waste sampling, shallow gas wells were installed at both sites to allow for trace gas analysis. The results of the trace gas anaiysis indicated high spatial variability at both sites. A range of volatile organic carbons (VOCs) were detected in the samples. When compared to landfills in Ontario, the two Saskatchewan landfills showed low to medium levels of VOCs, with the exception of freons. Gas samples from both Saskatchewan landfills had benzene and vinyl chloride concentrations exceeding the limit set by the Occupational Health and Safety Act. Two methods were used, a flux chamber system and a flame ionization detectox, to examine methane and carbon dioxide ernissions. The flame ionization detector proved useful for preliminary analysis of the site, while the flux chamber was very useful for detailed analysis of emission rates. The emission rates were estimated as 8842 tonne/year of methane and 34,353 tonne/year of carbon dioxide at the Regina Fleet Street Landfill, and 3176 tonne/year of methane and 15,146 tonne/year of carbon dioxide at the Saskatoon Landfill. A U.S. EPA landfill gas model was used to estimate gas generation at the Regina Fleet Street Landfill. The field results were on the higher end of the range suggested by the model. At both landfills, the ernissions showed high spatial variability and were concentrated along the dopes. The ernissions rates, 4.65 m3/tonne/year for the Regina Fleet Street Landfill and 6.6 rn’/t nne/ ear for the Saskatoon Landfill, are in the low to medium range of landfill gas emission rates reported for landfills in North America

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