Biogas

Ben, M.; Kennes, Christian; Veiga, María C.

doi:10.1002/9781118523360.ch14

Cited by 1 publication

(1 citation statement)

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“…When the latter is low, chemical processes are usually preferred, and when oil prices rise, bioprocesses regain interest. On the other hand, it is often difficult for bioprocesses to compete with the catalytic alternatives in terms of cost-effectiveness, although bio-based SCFAs are generally more environmentally friendly and they are produced under milder conditions, e.g., near room temperature and pressure, typical of anaerobic digestion processes for the production of biogas or SCFA [ 70 ]. In this sense, a recent work on LCA of SCFAs production from protein- and carbohydrate-rich organic wastes has clearly shown that biotechnologically produced acetic acid was more favourable than chemical synthesis [ 71 ].…”

Section: Comparison Of Chemical Synthesis and Biosynthesis Of Scfasmentioning

confidence: 99%

Production of short-chain fatty acids (SCFAs) as chemicals or substrates for microbes to obtain biochemicals

Tomás-Pejó,

González-Fernández,

Greses

et al. 2023

Biotechnol Biofuels

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Carboxylic acids have become interesting platform molecules in the last years due to their versatility to act as carbon sources for different microorganisms or as precursors for the chemical industry. Among carboxylic acids, short-chain fatty acids (SCFAs) such as acetic, propionic, butyric, valeric, and caproic acids can be biotechnologically produced in an anaerobic fermentation process from lignocellulose or other organic wastes of agricultural, industrial, or municipal origin. The biosynthesis of SCFAs is advantageous compared to chemical synthesis, since the latter relies on fossil-derived raw materials, expensive and toxic catalysts and harsh process conditions. This review article gives an overview on biosynthesis of SCFAs from complex waste products. Different applications of SCFAs are explored and how these acids can be considered as a source of bioproducts, aiming at the development of a circular economy. The use of SCFAs as platform molecules requires adequate concentration and separation processes that are also addressed in this review. Various microorganisms such as bacteria or oleaginous yeasts can efficiently use SCFA mixtures derived from anaerobic fermentation, an attribute that can be exploited in microbial electrolytic cells or to produce biopolymers such as microbial oils or polyhydroxyalkanoates. Promising technologies for the microbial conversion of SCFAs into bioproducts are outlined with recent examples, highlighting SCFAs as interesting platform molecules for the development of future bioeconomy.

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Section: Comparison Of Chemical Synthesis and Biosynthesis Of Scfasmentioning

confidence: 99%