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

Christopher H. Bühlmann; Bede S. Mickan; Stephan Tait; Damien J. Batstone; Parisa A. Bahri

doi:10.3389/fbioe.2023.1177739

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

Journal article

Open access

Peer reviewed

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

Christopher H. Bühlmann, Bede S. Mickan, Stephan Tait, Damien J. Batstone and Parisa A. Bahri

Frontiers in bioengineering and biotechnology, Vol.11, 1177739

2023

DOI: https://doi.org/10.3389/fbioe.2023.1177739

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Abstract

Bioengineering and Biotechnology

digestate

fermentation

food waste

lactic acid

mixed culture

nitrogen

organic acid

Low 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.

Details

Title: Lactic acid production from food waste at an anaerobic digestion biorefinery: effect of digestate recirculation and sucrose supplementation
Authors/Creators: Christopher H. Bühlmann - Murdoch University
Bede S. Mickan - The University of Western Australia
Stephan Tait - , , , , , , , , , , , , , , , , , , , , , , ,
Damien J. Batstone - The University of Queensland
Parisa A. Bahri - , , , , , , , , , , , , , , , , , , , , , , ,
Publication Details: Frontiers in bioengineering and biotechnology, Vol.11, 1177739
Publisher: Frontiers Media S.A
Identifiers: 991005581770207891
Murdoch Affiliation: School of Engineering and Energy; Centre for Water, Energy and Waste
Language: English
Resource Type: Journal article

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#12 Responsible Consumption & Production

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Collaboration types: Domestic collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.83 Bioengineering; 3.83.416 Anaerobic Digestion
Web Of Science research areas: Biotechnology & Applied Microbiology; Engineering, Biomedical
ESI research areas: Biology & Biochemistry