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Fermentation
Special Issues
New Research on Anaerobic Digestion: Second Edition
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New Research on Anaerobic Digestion: Second Edition

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2911

Special Issue Editor

Dr. Steven Wainaina

E-Mail Website
Guest Editor
Swedish Centre for Resource Recovery, University of Borås, SE 50190 Borås, Sweden
Interests: circular economy; waste valorization; anaerobic digestion; membrane bioreactors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic waste is a significant global concern, with large amounts generated from households, industrial processes, and agricultural activities. One widely accepted biological treatment technology for this waste is anaerobic digestion (AD). Historically, AD has focused on producing biogas and a nutrient-rich effluent. Biogas is a renewable energy source that can reduce reliance on fossil fuels. However, AD has evolved to also yield other high-value bioproducts, such as volatile fatty acids (VFAs) and biohydrogen, which can be used as building blocks in various industrial processes or as a clean energy source. AD can contribute to creating circular economies and has the advantage of utilizing a wide range of substrates while avoiding the need for sterile working conditions. Despite its potential, some bottlenecks remain, including techno-economics, bioreactor hydrodynamics, the separation of end-products, and understanding microbial interactions. This Special Issue calls for novel research to address these challenges and cutting-edge research on substrate pretreatment, dry digestion, microbial community analysis, emerging biogas applications, and downstream processing, including biogas upgrading. 

This is a second Special Issue, following the success of “Anaerobic Digestion of Waste”, which can be viewed here: https://www.mdpi.com/journal/fermentation/special_issues/anaerobic_digestion1

Dr. Steven Wainaina
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 2100 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

  • biogas
  • volatile fatty acids
  • biohydrogen
  • bioreactors
  • dry digestion
  • biorefinery
  • circular economy

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Published Papers (1 paper)

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19 pages, 2633 KiB  
Article
Elucidating Key Microbial Drivers for Methane Production during Cold Adaptation and Psychrophilic Anaerobic Digestion of Cattle Manure and Food Waste
by Haripriya Rama, Busiswa Ndaba, Mokhotjwa Simon Dhlamini, Nicolene Cochrane, Malik Maaza and Ashira Roopnarain
Fermentation 2024, 10(7), 370; https://doi.org/10.3390/fermentation10070370 - 19 Jul 2024
Cited by 3 | Viewed by 1845
Abstract
At psychrophilic temperatures (<20 °C), anaerobic digestion produces less methane (CH4). For psychrophilic anaerobic digestion (PAD) to be successful, investigation of cold-adapted microbial consortia involved in methane production is critical. This study aimed to investigate the microbial community driving enhanced methane [...] Read more.
At psychrophilic temperatures (<20 °C), anaerobic digestion produces less methane (CH4). For psychrophilic anaerobic digestion (PAD) to be successful, investigation of cold-adapted microbial consortia involved in methane production is critical. This study aimed to investigate the microbial community driving enhanced methane production from the cold-adaptation process and bioaugmentation of PAD with cold-adapted inoculum (BI). Microbial consortia in cattle manure (CM) and food waste (FW) were adapted and applied during batch PAD of CM and FW to bioaugment methane production at 15 °C. Cold adaptation and PAD with BI resulted in cumulative specific methane yields of 0.874 ± 0.231 and 0.552 ± 0.089 L CH4 g−1 volatile solids, respectively, after 14 weeks, while the absence of BI (control) led to acidification and no methane production during PAD. Following 16S rRNA V4–V5 amplicon sequencing and metagenomic analyses, Methanosarcina was revealed as a key driver of methanogenesis during cold adaptation and PAD bioaugmentation. Furthermore, based on the predictive functional and metabolic analysis of the communities, possible synergies were proposed in terms of substrate production and utilization by the dominant microbial groups. For instance, during methane production, Bacteroides and Methanobrevibacter were possibly involved in a syntrophic relationship, which promoted methanogenesis by Methanosarcina. These findings provide insight into the prospective microbial synergies that can be harnessed and/or regulated in cold-adapted inoculum for the improvement of methane production during PAD. Full article
(This article belongs to the Special Issue New Research on Anaerobic Digestion: Second Edition)
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