Characterization of humic acids produced during composting of olive mill wastes: elemental and spectroscopic analyses (FTIR and C-13-NMR)

摘要

The purpose of this study is to follow the evolution of the humic acids generated during olive mill wastes composting, by elemental analysis and spectroscopic methods ( Fourier Transform Infra- Red: FTIR and Nuclear Magnetic Resonance: C-13-NMR), in order to determine the stability and the maturity of the final compost. During composting, the humic acids presented a decrease of the peptidic and aliphatic structures and an increase of the aromatic structures. This confirms the stability of the final product after 12 months of composting. It results from this study that the quality of the humic substances generated could be an useful indicator to evaluate the maturity of the final product and to assess its agronomic value.