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Pyrolysis behaviour of different paper industry waste materials

Research Areas
  • Chemistry,
  • Agriculture,
  • Environmental policy

Paper pulp manufacturing separates cellulose fibres using both, mechanical and chemical process and generates important amount of waste materials with high organic matter content, especially cellulose fibres. In recent years, the recycling of paper is increasing significantly due to their important economical and environmental benefits [1]. However, the removal of the ink, clay and coatings from creates large amounts of waste materials. Previous works carried out by our research group have showed as pyrolysis of paper industry waste leads to carbon-based adsorbents with elevated metal and organic matter removal [2,3]. The main objective of the present work is to study the similarities and differences on the pyrolysis behavior of paper industry waste materials. In order to achieve that, 10 paper industry waste materials were selected from different industries and widely characterized according to their pH, CIC, organic matter and CaCO3 content. Representative SEM micrographs of waste materials were achieved. Finally, FTIR of samples and thermogravimetry analysis in air and nitrogen atmosphere were made. In general, waste materials from recycling paper showed elevated CaCO3 content leading to basic materials (pH from 7.7 to 9.2). The appearance of cellulose fibres was more broken as the recycled cycle¿s increases and more deteriorate cellulose fibres correspond to de-inking sludges from press paper. The presence of more functional groups observed by FTIR corresponds to de-inking paper sludges. Finally, TG, DTG and DTA analysis show main differences in the composition and pyrolyisis behavior of different paper industry waste materials. In general, three different zones were observed, at temperatures lower than 450ºC weight loss mainly corresponds to cellulose fibres decomposition, greatly influenced by their origin, and other organic compounds; the second area (<550ºC) was related to dehydration of kaolinite present in waste materials from recycled paper and finally, at elevated emperatures, carbonate decomposition was produced.
18th international Symposium on Analytical and Applied Pyrolysis
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Special issue Pyrolysys 2008 Advances in Analytycal and Applied Pyrolysys 2006-2008

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Valorización de Recursos
  • Departamento: Edafología
  • Departamento: Ingeniería de Materiales