Thermal processing of paper sludge and characterisation of its pyrolysis products |
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| Authors: | Vladimir Strezov Tim J. Evans |
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| Affiliation: | 1. Aristotle University of Thessaloniki, Greece;2. University of Thessaly, Greece;3. National Technical University of Athens, Greece;1. Department of Chemistry and CESAM (Centre for Environmental and Marine Studies), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;2. Department of Chemistry and CICECO (Centre for Research in Ceramics and Composite Materials), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;3. Instituto Nacional del Carbón, INCAR-CSIC, Apartado 73, 33080 Oviedo, Spain;4. Department of Applied Chemistry and Physics, IMARENABIO, University of Léon, Campus de Vegazana, Léon, Spain;1. Department of Applied Chemistry and Physics, IMARENABIO (Institute of Environment, Natural Resources and Biodiversity), Campus de Vegazana, University of León, 24071 León, Spain;2. Department of Chemistry and CESAM (Centre for Environmental and Marine Studies), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;1. MOE Engineering Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, China;2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China |
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| Abstract: | Paper sludge is a waste product from the paper and pulp manufacturing industry that is generally disposed of in landfills. Pyrolysis of paper sludge can potentially provide an option for managing this waste by thermal conversion to higher calorific value fuels, bio-gas, bio-oils and charcoal. This work investigates the properties of paper sludge during pyrolysis and energy required to perform thermal conversion. The products of paper sludge pyrolysis were also investigated to determine their properties and potential energy value. The dominant volatile species of paper sludge pyrolysis at 10 °C/min were found to be CO and CO2, contributing to almost 25% of the paper sludge dry weight loss at 500 °C. The hydrocarbons (CH4, C2H4, C2H6) and hydrogen contributed to only 1% of the total weight loss. The bio-oils collected at 500 °C were primarily comprised of organic acids with the major contribution being linoleic acid, 2,4-decadienal acid and oleic acid. The high acidic content indicates that in order to convert the paper sludge bio-oil to bio-diesel or petrochemicals, further upgrading would be necessary. The charcoal produced at 500 °C had a calorific value of 13.3 MJ/kg. |
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