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Towards sustainable valorization of blackcurrant pomace: Investigation of hot-water extraction combined with hydrothermal liquefaction

Author

Listed:
  • Wądrzyk, Mariusz
  • Plata, Marek
  • Korzeniowski, Łukasz
  • Janus, Rafał
  • Lewandowski, Marek

Abstract

Blackcurrants are popular fruits dominantly used for processing, resulting in the abundant generation of blackcurrant pomace (BCP). BCP is a waste containing valuable compounds, but it is not effectively utilized. This study presents an approach integrating hot-water extraction (HWE) and hydrothermal liquefaction (HTL) for the sustainable valorization of industrial-origin BCP. The HWE stage aimed to isolate monosaccharides and bioactive compounds. Subsequently, the resultant solid extraction residue and raw material (for comparison purposes) were subjected to HTL at 225–325 °C. The pretreatment allowed for the isolation of 22.2 wt% of the BCP into the aqueous phase consisting of 37 % of the reducing sugars. Conversion of extraction residue via HTL resulted in biocrude with the yield reaching 39 wt% which was increased by ca. 5–6 wt% compared to direct HTL. The pretreatment also affected its quality, which is characterized by higher carbon content and heating value, as well as lower oxygen content. Performed analyses (FT-IR, GC-MS, GPC) showed slight changes in the composition of the biocrude. Overall, the studied approach is double beneficial because it allows for the acquisition of an additional sugar-rich extract stream which could be used in multiple ways (biocomponents, platform chemicals) and increases the efficiency of HTL conversion.

Suggested Citation

  • Wądrzyk, Mariusz & Plata, Marek & Korzeniowski, Łukasz & Janus, Rafał & Lewandowski, Marek, 2025. "Towards sustainable valorization of blackcurrant pomace: Investigation of hot-water extraction combined with hydrothermal liquefaction," Renewable Energy, Elsevier, vol. 240(C).
    • Handle: RePEc:eee:renene:v:240:y:2025:i:c:s0960148124021852
    DOI: 10.1016/j.renene.2024.122117
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