Disposal of plastic mulching film through CO₂-assisted catalytic pyrolysis as a strategic means for microplastic mitigation

Jong-Min JUNG, Seong-Heon CHO, Sungyup JUNG, Kun-Yi Andrew LIN, Wei-Hsin CHEN, Yiu Fai TSANG, Eilhann E. KWON

Research output: Contribution to journalArticlespeer-review

2 Citations (Scopus)

Abstract

Conventional disposal processes (incineration and landfilling) of agricultural plastic wastes release harmful chemicals and microplastics into our ecosystems. To provide a disposal platform not releasing harmful chemicals, pyrolysis of a representative agricultural plastic waste was proposed in this study. Spent plastic mulching film (SMF) was used as a model waste compound. To make pyrolysis process more environmentally benign, CO₂ was used as a raw material in pyrolysis of SMF. H₂ and hydrocarbons were produced from pyrolysis of SMF under the inert (N₂) and CO₂ conditions, because SMF is composed of polyethylene. To enhance conversion of hydrocarbons into H₂, catalytic pyrolysis of SMF was conducted over Ni/SiO₂. Compared to non-catalytic pyrolysis, total concentration of pyrolytic gases was enhanced up to 3.1 and 11.3 times under N₂ and CO₂ conditions, respectively. The gas phase reactions between CO₂ and hydrocarbons led to formation of CO, which enhanced production of pyrolytic gases under the CO₂ condition. Moreover, gas phase reactions resulted in less production of pyrolytic oil from CO₂ condition (15.9 wt.%) in reference to the N₂ condition (22.6 wt.%). All experimental results confirmed that CO₂ and SMF can be used as useful feedstocks to produce value-added products. Copyright © 2022 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number128454
JournalJournal of Hazardous Materials
Volume430
Early online date09 Feb 2022
DOIs
Publication statusPublished - 15 May 2022

Citation

Jung, J.-M., Cho, S.-H., Jung, S., Lin, K.-Y. A., Chen, W.-H., Tsang, Y. F., & Kwon, E. E. (2022). Disposal of plastic mulching film through CO₂-assisted catalytic pyrolysis as a strategic means for microplastic mitigation. Journal of Hazardous Materials, 430. Retrieved from https://doi.org/10.1016/j.jhazmat.2022.128454

Keywords

  • Circular economy
  • Waste-to-energy
  • Waste valorization
  • Catalytic pyrolysis
  • (micro)Plastic disposal
  • Carbon dioxide

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