Lactic acid production from food waste at an anaerobic digestion biorefinery: effect of digestate recirculation and sucrose supplementation

Article

Buhlmann, Christopher H., Mickan, Bede S., Tait, Stephan, Batstone, Damien J. and Bahri, Parisa A. 2023. "Lactic acid production from food waste at an anaerobic digestion biorefinery: effect of digestate recirculation and sucrose supplementation." Frontiers in Bioengineering and Biotechnology. 11. https://doi.org/10.3389/fbioe.2023.1177739
Article Title

Lactic acid production from food waste at an anaerobic digestion biorefinery: effect of digestate recirculation and sucrose supplementation

ERA Journal ID200511
Article CategoryArticle
AuthorsBuhlmann, Christopher H., Mickan, Bede S., Tait, Stephan, Batstone, Damien J. and Bahri, Parisa A
Journal TitleFrontiers in Bioengineering and Biotechnology
Journal Citation11
Article Number1177739
Number of Pages12
Year2023
PublisherFrontiers Media SA
Place of PublicationSwitzerland
ISSN2296-4185
Digital Object Identifier (DOI)https://doi.org/10.3389/fbioe.2023.1177739
Web Address (URL)https://www.frontiersin.org/articles/10.3389/fbioe.2023.1177739/full
AbstractLow lactic acid (LA) yields from direct food waste (FW) fermentation restrict this production pathway. However, nitrogen and other nutrients within FW digestate, in combination with sucrose supplementation, may enhance LA production and improve feasibility of fermentation. Therefore, this work aimed to improve LA fermentation from FWs by supplementing nitrogen (0–400 mgN·L?1) as NH4Cl or digestate and dosing sucrose (0–150 g·L?1) as a low-cost carbohydrate. Overall, NH4Cl and digestate led to similar improvements in the rate of LA formation (0.03 ± 0.02 and 0.04 ± 0.02 h?1 for NH4Cl and digestate, respectively), but NH4Cl also improved the final concentration, though effects varied between treatments (5.2 ± 4.6 g·L?1). While digestate altered the community composition and increased diversity, sucrose minimised community diversion from LA, promoted Lactobacillus growth at all dosages, and enhanced the final LA concentration from 25 to 30 g·L?1 to 59–68 g·L?1, depending on nitrogen dosage and source. Overall, the results highlighted the value of digestate as a nutrient source and sucrose as both community controller and means to enhance the LA concentration in future LA biorefinery concepts. Copyright © 2023 Bühlmann, Mickan, Tait, Batstone and Bahri.
Keywordsdigestate; fermentation; lactic acid; food waste; nitrogen; mixed culture; organic acid
ANZSRC Field of Research 20203099. Other agricultural, veterinary and food sciences
Byline AffiliationsMurdoch University
University of Western Australia
Richgro Garden Products, Australia
Centre for Agricultural Engineering
University of Queensland
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