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Fermentation
Special Issues
Waste Fermentation and Volatile Fatty Acids
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Waste Fermentation and Volatile Fatty Acids

A special issue of Fermentation (ISSN 2311-5637). This special issue belongs to the section "Fermentation Process Design".

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 6194

Special Issue Editor

Dr. Merve Atasoy

E-Mail Website
Guest Editor
Wageningen University and Research, Wageningen, The Netherlands
Interests: waste; fermentation; microbial community; fatty acid production

Special Issue Information

Dear Colleagues,

Petrol-based chemical production has caused an increase in CO2 emissions from 2 billion tonnes to over 36 billion tonnes in the last 115 years. Developing sustainable, environmentally friendly, and economically competitive bioproduction processes is the most essential way to reach the Sustainable Development Goals of the United Nations, as well as to achieve the targets of the Paris Agreement for keeping global warming under 2 °C. The transformation of the traditional wastewater treatment plants into biorefineries, which use waste streams as feedstock, provides an attractive opportunity to reach sustainable bioproduction. Several studies for bio-based production from waste streams have been conducted in recent years. Among bioproducts, volatile fatty acid (VFA) is one of the most promising products due to its versatile usage area with high market demand.

VFAs (mainly acetic acid, propionic acid, and butyric acid) are intermediate products of anaerobic digestion and, besides their wide application potential in downstream and upstream processes, they have unique advantages (e.g., environmentally friendly, renewable, and sustainable) over petrol-based production. Nevertheless, several challenges such as low production efficiency, complications in purification and separation of the end products, post-process requirements with unstable scalability of the process, and high substrate costs mean that approximately 98% of global VFA production is supplied synthetically from petrochemical derivatives.

In this Special Issue, we aim to present the latest advances in the production of VFAs that address the limitations of biobased VFA production.

Dr. Merve Atasoy
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fermentation is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • volatile fatty acids
  • carboxylate platform
  • mixed culture fermentation
  • pure and co-culture fermentation
  • operational conditions
  • waste streams
  • biobased products
  • resource recovery

Published Papers (2 papers)

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Research

11 pages, 1377 KiB  
Article
Valorization of Low-Cost Substrates for the Production of Odd Chain Fatty Acids by the Oleaginous Yeast Yarrowia lipolytica
by Sally El Kantar and Mohamed Koubaa
Fermentation 2022, 8(6), 284; https://doi.org/10.3390/fermentation8060284 - 16 Jun 2022
Cited by 8 | Viewed by 2186
Abstract
Odd-chain fatty acids (OCFAs) have recently gained interest as target compounds in microbial production due to their diverse applications in the medical, pharmaceutical and chemical industries for the production of biofuels. Yarrowia lipolytica is a promising oleaginous yeast that has the ability to [...] Read more.
Odd-chain fatty acids (OCFAs) have recently gained interest as target compounds in microbial production due to their diverse applications in the medical, pharmaceutical and chemical industries for the production of biofuels. Yarrowia lipolytica is a promising oleaginous yeast that has the ability to accumulate high quantities of fatty acids. However, the use of Y. lipolytica oils is still under research, in order to decrease the production costs related to the fermentation process and improve economic feasibility. In this work, sugar beet molasses (10–50 g/L) and crude glycerol (30 g/L) were used as the main carbon sources to reduce the processing costs of oil production from a genetically engineered Y. lipolytica strain. The effects of medium composition were studied on biomass production, lipid content, and OCFAs profile. Lipid production by yeast growing on molasses (20 g/L sucrose) and crude glycerol reached 4.63 ± 0.95 g/L of culture medium. OCFAs content represented 58% of the total fatty acids in lipids, which corresponds to ≈2.69 ± 0.03 g/L of culture medium. The fermentation was upscaled to 5 L bioreactors and fed-batch co-feeding increased OCFA accumulation in Y. lipolytica by 56% compared to batch cultures. Full article
(This article belongs to the Special Issue Waste Fermentation and Volatile Fatty Acids)
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17 pages, 1767 KiB  
Article
Improved Spectrophotometric Method for Determination of High-Range Volatile Fatty Acids in Mixed Acid Fermentation of Organic Residues
by Natthiporn Aramrueang, Passanun Lomwongsopon, Sasiprapa Boonsong and Papassorn Kingklao
Fermentation 2022, 8(5), 202; https://doi.org/10.3390/fermentation8050202 - 29 Apr 2022
Viewed by 3356
Abstract
Volatile fatty acids (VFAs) are the important intermediates indicating the stability and performance of fermentation process. This study developed the spectrophotometric method for determining high-range VFA concentration in mixed-acid fermentation samples. The performance was compared with the gas chromatography (GC) technique. The calibration [...] Read more.
Volatile fatty acids (VFAs) are the important intermediates indicating the stability and performance of fermentation process. This study developed the spectrophotometric method for determining high-range VFA concentration in mixed-acid fermentation samples. The performance was compared with the gas chromatography (GC) technique. The calibration curves of the modified method showed linearity over a wide and high concentration range of 250–5000 mg/L for individual C2–C6 VFAs in both linear and branched chains. In order to evaluate the modified method for VFA determination in complex fermentation matrices, fermentation samples produced from acidogenic fermentation of plant materials were spiked with acetic (500–1500 mg/L) and butyric acids (1000 mg/L). The accuracy and precision of the modified method for VFA determination were in the range of 94.68–106.50% and 2.35–9.26%, respectively, comparable to the GC method (94.42–99.13% and 0.17–1.93%). The developed method was applicable to measuring all C2–C6 compounds and VFA concentrations in the fermentation samples and had an acceptable accuracy and precision. The proposed method is analytically reliable and offers significant advantages in the rapid determination of VFAs in mixed acid fermentation of organic residues. Full article
(This article belongs to the Special Issue Waste Fermentation and Volatile Fatty Acids)
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