CO2 emissions from a municipal site for final disposal of solid waste in Gualeguaychu, Entre Rios Province, Argentina

SANCI ROMINA, PANARELLO HÉCTOR O. Y OSTERA HÉCTOR A.

Environmental Earth Sciences

SPRINGER

Año: 2012 vol. 66 p. 519 - 528

1866-6280

This paper estimates CO2 fluxes in a municipal site for final disposal of solid waste, located in Gualeguaychu, Argentina. Estimations were made using the accumulation chamber methods, which had been calibrated previously in laboratory. CO2 fluxes ranged from 31 to 331 g m-2 day-1. Three different populations were identified: background soil gases averaging 46 g m-2 day-1, intermediate anomalous values averaging 110 g m-2 day-1 and high anomalous values averaging 270 g m-2 day-1. Gas samples to a depth of 20 cmwere also taken. Gas fractions, XCO2 less than 0.1, XCH4 less than 0.01, XN2 similar to 0.71 and XO2 similar to 0.21, d13C of CO2 (-34 to -18%), as well as age of waste emplacement, suggest that the study site may be at the final stage of aerobic biodegradation. In a first approach, and following the downstream direction of groundwater flow, alkalinity and d13C of dissolved inorganic carbon (-15 to 4%) were observed to increase when groundwater passed through the disposal site. This suggests that the CO2 generated by waste biodegradation dissolves or that dissolved organic matter appears as a result of leachate degradation.