| Title |
Direct Conversion of Food Waste Extract into Caproate: Metagenomics Assessment of Chain Elongation Process |
| ID_Doc |
8541 |
| Authors |
Crognale, S; Braguglia, CM; Gallipoli, A; Gianico, A; Rossetti, S; Montecchio, D |
| Title |
Direct Conversion of Food Waste Extract into Caproate: Metagenomics Assessment of Chain Elongation Process |
| Year |
2021 |
| Published |
Microorganisms, 9.0, 2 |
| DOI |
10.3390/microorganisms9020327 |
| Abstract |
In a circular economy strategy, waste resources can be used for the biological production of high added-value substances, such as medium chain fatty acids (MCFAs), thus minimising waste and favouring a sustainable process. This study investigates single-stage fermentation processes for the production of MCFAs in a semi-continuous reactor treating the extract of real food waste (FW), without the addition of external electron donors. Two sequential acidogenic fermentation tests were carried out at an organic loading rate (OLR) of 5 and 15 gCOD L(-1)d(-1) with a hydraulic retention time of 4 days and pH controlled at 6 +/- 0.2. The highest level of caproate (4.8 g L-1) was observed at OLR of 15 gCOD L(-1)d(-1) with a microbiome mainly composed by lactate-producing Actinomyces, Atopobium, and Olsenella species and caproate-producing Pseudoramibacter. Metagenomic analysis revealed the presence of key enzymes for the production of lactate, such as lactate dehydrogenase and pyruvate ferredoxin oxidoreductase, as well as several enzymes involved in the reverse beta-oxidation pathway, thus suggesting the occurrence of a lactate-based chain elongation process. |
| Author Keywords |
medium chain fatty acids; microbial chain elongation; caproate; waste valorisation; metagenomics |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000622840100001 |
| WoS Category |
Microbiology |
| Research Area |
Microbiology |
| PDF |
https://www.mdpi.com/2076-2607/9/2/327/pdf?version=1612748337
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