Lactic acid production from food waste using a microbial consortium: Focus on key parameters for process upscaling and fermentation residues valorization - Archive ouverte HAL Access content directly
Journal Articles Bioresource Technology Year : 2022

Lactic acid production from food waste using a microbial consortium: Focus on key parameters for process upscaling and fermentation residues valorization

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Abstract

In this study, the production of lactic acid from food waste in industrially relevant conditions was investigated. Laboratory assays were first performed in batch conditions to determine the suitable operational parameters for an efficient lactic acid production. The use of compost as inoculum, the regulation of temperature at 35 °C and pH at 5 enhanced the development of Lactobacillus sp. resulting in the production of 70 g/L of lactic acid with a selectivity of 89% over the other carboxylic acids. Those parameters were then applied at pilot scale in successive fed-batch fermentations. The subsequent high concentration (68 g/L), yield (0.38 g/gTS) and selectivity (77%) in lactic acid demonstrated the applicability of the process. To integrate the process into a complete value chain, fermentation residues were then converted into biogas through anaerobic digestion. Lastly, the experiment was successfully replicated using commercial and municipal waste collected in France.
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Dates and versions

hal-03747349 , version 1 (08-08-2022)

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Célia Chenebault, Roman Moscoviz, Eric Trably, Renaud Escudié, Benjamin Percheron. Lactic acid production from food waste using a microbial consortium: Focus on key parameters for process upscaling and fermentation residues valorization. Bioresource Technology, 2022, 354, pp.127230. ⟨10.1016/j.biortech.2022.127230⟩. ⟨hal-03747349⟩
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