Fermentative Production of Lactic Acid as a Sustainable Approach to Valorize Household Bio-Waste

Panagiotis Tsapekos, Merlin Alvarado-Morales, Samin Baladi, Elleke F. Bosma, Irini Angelidaki*

*Corresponding author for this work

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Abstract

Source-sorted organic portion of municipal solid waste (bio-waste) can be fermented to lactic acid, a platform chemical widely used in the production of biodegradable polymers, green solvents, and chemicals. In the present study, fermentation of bio-waste using lactic acid producing bacterium (LAB) Lactobacillus delbrueckii was investigated. Results showed that adding 10% (v/v) of L. delbrueckii as LAB inoculum along with pH adjustment to 6.2 had the highest lactic acid yield (0.65 g/gtotal sugars). Nevertheless, pH adjustment without bio-augmentation could also result in relatively high yield of lactic acid (0.57 g/gtotal sugars). Furthermore, enzymatic hydrolysis was applied to boost the lactic acid production slightly increasing the yield to 0.72 g/gtotal sugars. Thus, fermentative production of lactic acid can be achieved without the addition of enzymes to reduce production costs. Overall, the results indicate that bio-waste could be a suitable substrate for the production of lactic acid.
Original languageEnglish
Article number4
JournalFrontiers in Sustainability
Volume1
Number of pages12
ISSN2673-4524
DOIs
Publication statusPublished - 2020

Bibliographical note

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

Keywords

  • Lactobacillus delbrueckii
  • Fermentation
  • Lactic acid
  • Bio-waste
  • Enzymatic hydrolysis

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