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Mixed-waste pyrolysis of biomass and plastics waste – A modelling approach to reduce energy usage

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  • Oyedun, Adetoyese Olajire
  • Gebreegziabher, Tesfaldet
  • Ng, Denny K.S.
  • Hui, Chi Wai

Abstract

Thermal co-processing of waste mixtures had gained a lot of attention in the last decade. This is largely due to certain synergistic effects such as higher quantity and better quality of oil, limited supply of certain feedstock and improving the overall pyrolysis process. Many experiments have been conducted via TGA analysis and different reactors to achieve the stated synergistic effects in co-pyrolysis of biomass and plastic wastes. The thermal behaviour of plastics during pyrolysis is different from that of biomass because its decomposition happens at a high temperature range with sudden release of volatile compared to biomass which have a wide range of thermal decomposition. A properly designed recipe and operational strategy of mixing feedstock can ease the operational difficulties and at the same time decrease energy consumption and/or improve the product yield. Therefore it is worthwhile to study the possible synergistic effects on the overall energy used during co-pyrolysis process. In this work, two different modelling approaches were used to study the energy related synergistic effect between polystyrene (PS) and bamboo waste. The mass loss and volatile generation profiles show that significant interactions between the two feedstocks exist. The results also show that both modelling approaches give an appreciable synergy effect of reduction in overall energy when PS and bamboo are co-pyrolysed together. However, the second approach which allows interaction between the two feedstocks gives a more reduction in overall energy usage up to 6.2% depending on the ratio of PS in the mixed blend.

Suggested Citation

  • Oyedun, Adetoyese Olajire & Gebreegziabher, Tesfaldet & Ng, Denny K.S. & Hui, Chi Wai, 2014. "Mixed-waste pyrolysis of biomass and plastics waste – A modelling approach to reduce energy usage," Energy, Elsevier, vol. 75(C), pages 127-135.
    • Handle: RePEc:eee:energy:v:75:y:2014:i:c:p:127-135
    DOI: 10.1016/j.energy.2014.05.063
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    4. Lopez, Gartzen & Artetxe, Maite & Amutio, Maider & Bilbao, Javier & Olazar, Martin, 2017. "Thermochemical routes for the valorization of waste polyolefinic plastics to produce fuels and chemicals. A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 346-368.
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    9. Fivga, Antzela & Dimitriou, Ioanna, 2018. "Pyrolysis of plastic waste for production of heavy fuel substitute: A techno-economic assessment," Energy, Elsevier, vol. 149(C), pages 865-874.

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