Developing a food waste biorefinery: Lactic acid extraction using anionic resin and impacts on downstream biogas production

Buhlmann, Christopher H. and Mickan, Bede S. and Tait, Stephan ORCID: https://orcid.org/0000-0002-0816-8911 and Bahri, Parisa A. (2022) Developing a food waste biorefinery: Lactic acid extraction using anionic resin and impacts on downstream biogas production. Chemical Engineering Journal, 431 (3):133243. pp. 1-9. ISSN 1385-8947


Abstract

Coupling lactic acid (LA) production with food waste (FW) anaerobic digestion (AD) can facilitate the next generation biorefinery to increase revenue and economic viability of FW AD. For this, LA should be effectively extracted from complex fermentation broths with minimal adverse effects on subsequent AD to maximise economic benefit. This study evaluated LA recovery by adsorption using a polymeric resin (BA765), not previously tested for LA, to explore adsorption capacity and kinetics. Furthermore, biochemical methane potential (BMP) tests were utilised to assess the effect of LA extraction on subsequent AD by measuring biogas production from the solid and liquid extraction residues. Optimal adsorption conditions yielded a maximum capacity of 0.21 gLA·g−1resin from pure solutions at pH 2–4, which was insensitive to temperature. However, real mixed fermentation broth impurities reduced LA uptake by 37%. BMP tests showed that the solid and liquid extraction residues had significant methane potential, with only a 21% reduction in overall methane yield compared to the raw fermentation broth prior to LA extraction. LA production outweighed the loss in methane energy in terms of relative value and indicated a FW biorefinery concept could be commercially attractive and technically feasible.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Date Deposited: 17 Feb 2022 01:34
Last Modified: 17 Feb 2022 01:34
Uncontrolled Keywords: Anaerobic digestion; Adsorption; Renewable energy; Biorefinery; Lactic acid
Fields of Research (2008): 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401102 Environmentally sustainable engineering
40 ENGINEERING > 4011 Environmental engineering > 401106 Waste management, reduction, reuse and recycling
Identification Number or DOI: https://doi.org/10.1016/j.cej.2021.133243
URI: http://eprints.usq.edu.au/id/eprint/44208

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