Valorization of municipal organic waste into purified lactic acid

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Abstract

Municipal organic waste (biowaste) consists of food derived starch, protein and sugars, and lignocellulose derived cellulose, hemicellulose, lignin and pectin. Proper management enables nutrient recycling and sustainable production of platform chemicals such as lactic acid (LA). This review gathers the most important information regarding use of biowaste for LA fermentation covering pre-treatment, enzymatic hydrolysis, fermentation and downstream processing to achieve high purity LA. The optimal approach was found to treat the two biowaste fractions separately due to different pre-treatment and enzyme needs for achieving enzymatic hydrolysis and to do continues fermentation to achieve high cell density and high LA productivity up to 12 g/L/h for production of both L and D isomers. The specific productivity was 0.4 to 0.5 h-1 but with recalcitrant biomass, the enzymatic hydrolysis was rate limiting. Novel purification approaches included reactive distillation and emulsion liquid membrane separation yielding purities sufficient for polylactic acid production.
Original languageEnglish
Article number125933
JournalBioresource Technology
Volume342
Number of pages12
ISSN0960-8524
DOIs
Publication statusPublished - 2021

Keywords

  • Lactic acid
  • Municipal organic waste
  • Enzymatic hydrolysis
  • Pre-treatment
  • Fermentation
  • Membrane purification

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