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The composition of pollutant gases (CO2, CO and SO2) during the co-combustion of Oil Shale (OS) and biomass wastes was studied in real time through thermogravimetric analysis (TG) coupled with a Fourier-Transform Infrared Spectrometer (FTIR). OS samples are from Mangrullo Formation (Uruguay). Biomass wastes were mixed with the OS at ratios 25%, 50% and 75% in mass of OS. Results showed that the emissions of pollutants per energy content of the mixture are related with the volatile decomposition and char reacting stages. CO2 emissions are significant during the volatile decomposition and subsequently combustion stage at the temperature between 400 and 500 °C. The profiles of CO2 against temperature exhibits one or two peaks, depending on the OS content of the sample and these emissions purely increased with the carbon content in the blends. The concentrations of SO2 obtained by the TG analysis showed that the amount released increases as the OS content rise. This work showed that the adding of biomass waste to the OS can improve the gas quality as reduces. Generally, the results showed that samples between 0 and 50% of OS-biomass produces lowest total SO2 emissions.

Pollutant gas emissions during the co-combustion of Oil Shales from Uruguay with biomass wastes