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Characterization of Composts and Humic Acids from Pulp and Paper Mill Biosludges by DSC in Association with FT-IR Spectroscopy

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Abstract

Samples of pulp and paper mill biosludges with different maturation ages (fresh biosludge and composts collected after 3 weeks, 1 year and 2 years of composting) and their corresponding humic acids were analyzed by thermal analysis with DSC in association with FT-IR spectroscopy. The DSC curves obtained exhibited endotherms in the low-temperature region, assigned to dehydration processes, exotherms at around 370°C, attributed to the loss of peptidic structures, and high-temperature exotherms, assigned to the loss of functional groups; the lignins were thermostable, regardless of the maturation age of the compost.

The results obtained provided evidence that, during composting, the organic matter evolved in the direction of higher molecular complexity and stability, leading to a more homogeneous product closely resembling humic-like substances.

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References

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Authors and Affiliations

  1. Istituto di Chimica Agraria, Università degli Studi di Bari, Via Amendola 165/a, Bari, Italy

    M. R. Provenzano & N. Senesi

  2. Department of Biological and Environmental Science, University of Jyväskyla Yliopislonkolu, 9, Jyväskyla, Finland

    V. Miikki

Authors
  1. M. R. Provenzano
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  2. N. Senesi
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  3. V. Miikki
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Provenzano, M.R., Senesi, N. & Miikki, V. Characterization of Composts and Humic Acids from Pulp and Paper Mill Biosludges by DSC in Association with FT-IR Spectroscopy. Journal of Thermal Analysis and Calorimetry 52, 1037–1046 (1998). https://doi.org/10.1023/A:1010149009749

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  • DOI: https://doi.org/10.1023/A:1010149009749

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