Development of an Effective Chain Elongation Process From Acidified Food Waste and Ethanol Into n-Caproate

Frontiers in Bioengineering and Biotechnology
Mark RoghairC J N Buisman

Abstract

Introduction: Medium chain fatty acids (MCFAs), such as n-caproate, are potential valuable platform chemicals. MCFAs can be produced from low-grade organic residues by anaerobic reactor microbiomes through two subsequent biological processes: hydrolysis combined with acidogenesis and chain elongation. Continuous chain elongation with organic residues becomes effective when the targeted MCFA(s) are produced at high concentrations and rates, while excessive ethanol oxidation and base consumption are limited. The objective of this study was to develop an effective continuous chain elongation process with hydrolyzed and acidified food waste and additional ethanol. Results: We fed acidified food waste (AFW) and ethanol to an anaerobic reactor while operating the reactor at long (4 d) and at short (1 d) hydraulic retention time (HRT). At long HRT, n-caproate was continuously produced (5.5 g/L/d) at an average concentration of 23.4 g/L. The highest n-caproate concentration was 25.7 g/L which is the highest reported n-caproate concentration in a chain elongation process to date. Compared to short HRT (7.1 g/L n-caproate at 5.6 g/L/d), long HRT resulted in 6.2 times less excessive ethanol oxidation. This led to a two times lower ethanol...Continue Reading

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Citations

Dec 8, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jose Antonio Magdalena, Cristina González-Fernández
Jan 27, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Vicky De GroofAna B Lanham
Sep 16, 2018·Applied and Environmental Microbiology·Wenhao HanFan Lü
Jan 2, 2020·Bioresource Technology·Pau San-ValeroChristian Kennes
Apr 27, 2021·Frontiers in Bioengineering and Biotechnology·Flávio C F BaleeiroHeike Sträuber
Jun 19, 2018·ACS Sustainable Chemistry & Engineering·Mark RoghairDavid P B T B Strik
Sep 7, 2021·Frontiers in Bioengineering and Biotechnology·Kasper D de LeeuwDavid P B T B Strik

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