Journal article
Valorization of municipal organic waste into purified lactic acid
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.
Language: | English |
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Year: | 2021 |
Pages: | 125933 |
ISSN: | 09608524 and 18732976 |
Types: | Journal article |
DOI: | 10.1016/j.biortech.2021.125933 |
ORCIDs: | Thygesen, Anders , Tsapekos, Panagiotis , Alvarado-Morales, Merlin and Angelidaki, Irini |
Enzymatic hydrolysis Fermentation Lactic acid Membrane purification Municipal organic waste Pre-treatment SDG 11 - Sustainable Cities and Communities