Saccharina latissima, candy-factory waste, and digestate from full-scale biogas plant as alternative carbohydrate and nutrient sources for lactic acid production

Eleftheria Papadopoulou, Charlene Vance, Paloma S. Rozene Vallespin, Panagiotis Tsapekos, Irini Angelidaki*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

To substitute petroleum-based materials with bio-based alternatives, microbial fermentation combined with inexpensive biomass is suggested. In this study Saccharina latissima hydrolysate, candy-factory waste, and digestate from full-scale biogas plant were explored as substrates for lactic acid production. The lactic acid bacteria Enterococcus faecium, Lactobacillus plantarum, and Pediococcus pentosaceus were tested as starter cultures. Sugars released from seaweed hydrolysate and candy-waste were successfully utilized by the studied bacterial strains. Additionally, seaweed hydrolysate and digestate served as nutrient supplements supporting microbial fermentation. According to the highest achieved relative lactic acid production, a scaled-up co-fermentation of candy-waste and digestate was performed. Lactic acid reached a concentration of 65.65 g/L, with 61.69% relative lactic acid production, and 1.37 g/L/hour productivity. The findings indicate that lactic acid can be successfully produced from low-cost industrial residues.
Original languageEnglish
Article number129078
JournalBioresource Technology
Volume380
Number of pages8
ISSN0960-8524
DOIs
Publication statusPublished - 2023

Keywords

  • Candy-waste
  • Digestate
  • Lactic acid
  • Lactic acid bacteria
  • Saccharina latissima

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