Study of Biological Stabilization Processes of Cattle and Poultry Manure by Thermogravimetric Analysis and super(13)C NMR

Study of biological stabilization process of cattle and poultry manure by thermogravimetric analysis and super(13)C NMR was conducted. The stabilization process carried out were namely, composting, anaerobic digestion and a mixed process. The stabilization of cattle manure by means of aerobic processes was able to further oxidize and enriched in aromatic compounds the bio-waste when compared with the digestion process. Stabilized samples with a high degree of aromaticity presented a lower volatile content accompanied by a reduction in the intensity of the differential thermogravimetry peak registered under an inert atmosphere, indicative of the thermal decomposition of the organic matter. It was observed that all stabilized samples yielded a lower degree of volatilization to that one observed in fresh samples.