Techno-economic assessment of non-sterile batch and continuous production of lactic acid from food waste

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Non-sterile lactic acid (LA)fermentation of highly viscous food waste was demonstrated in batch andcontinuous flow fermentations. With Streptococcussp., an indigenous consortium, and/or applied glucoamylase, food waste wasfermented without addition of external carbon or nitrogen sources. Experimentalresults were used for economic and energy evaluations under consideration ofdifferent catchment area sizes from 50,000 to 1,000,000 inhabitants. Duringbatch mode, addition of glucoamylase resulted in a titer (after 24 hours), yield,and productivity of 50 g L-1, 63%, and 2.93 g L-1 h-1,respectively. While titer and yield were enhanced, productivity was lower duringcontinuous operation and 69 g L-1, 86%, and 1.27 g L-1 h-1were obtained at a dilution rate of 0.44 d-1 when glucoamylase wasadded. Both batch and continuous flow fermentations were found economicallyprofitable with food waste from 200,000 or more inhabitants.

Original languageEnglish
Article number121631
JournalBioresource Technology
StatePublished - 01.10.2019

    Research areas

  • Chemistry - Biorefinery, Fermentation, Lactic acid, non sterile, TEA
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