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This study determined the hourly variations in the concentration of methane
(CH4), carbon dioxide (CO2), and oxygen (O2) during 24-hour periods in a
sanitary landfill located in Northeast Brazil, with a predominantly hot tropical
mild semi-arid climate. Data were collected over 24 hours in four campaigns in
November 2014 and January, March, and April 2015. The measurements were
taken in a drain of the sanitary landfill using a portable gas analyzer. We found
that, in general, the highest methane concentrations corresponded to the
highest biogas temperatures. The maximum concentration of CH4 (59.2%)
occurred at a temperature of 36.8ºC, while the minimum concentration of
CH4 (43.2%) was identified at a temperature of 25.4ºC. No relationship was
found between CH4 emissions and rainfall, with temperature being the factor
that most influenced the concentration of this gas.
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