Hydrothermal Co-Liquefaction of Food and Plastic Waste for Biocrude Production

Silvan Feuerbach, Saqib Sohail Toor, Paula A. Costa, Filipe Paradela, Paula A.A.S. Marques and Daniele Castello ()
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Silvan Feuerbach: AAU Energy, Aalborg University, Pontoppidanstræde 111, 9220 Aalborg, Denmark
Saqib Sohail Toor: AAU Energy, Aalborg University, Pontoppidanstræde 111, 9220 Aalborg, Denmark
Paula A. Costa: LNEG—Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
Filipe Paradela: LNEG—Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
Paula A.A.S. Marques: LNEG—Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
Daniele Castello: AAU Energy, Aalborg University, Pontoppidanstræde 111, 9220 Aalborg, Denmark

Energies, 2024, vol. 17, issue 9, 1-17

Abstract: In this study, hydrothermal co-liquefaction of restaurant waste for biocrude production was conducted. The feedstock was resembled using the organic fraction of restaurant waste and low-density polyethylene, polypropylene, polystyrene, and polyethylene terephthalate, four plastic types commonly present in municipal solid waste. Using design of experiment and a face-centered central composite design, three factors (feedstock plastic fraction, temperature, time) were varied at three levels each: feedstock plastic fraction (0, 0.25, 0.5), temperature (290 °C, 330 °C, 370 °C), and reaction time (0 min, 30 min, 60 min). The literature reports positive synergistic interactions in hydrothermal co-liquefaction of biomass and plastics; however, in this work, only negative synergistic interactions could be observed. A reason could be the high thermal stability of produced fatty acids that give little room for interactions with plastics. At the same time, mass might transfer to other product phases.

Keywords: co-liquefaction; co-HTL; food waste; restaurant waste; HTL; biooil; biocrude (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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