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Fermentation
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Modern Developments in Anaerobic Digestion Process: Resource Recovery and Energy...
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Special Issue "Modern Developments in Anaerobic Digestion Process: Resource Recovery and Energy Production"

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

Deadline for manuscript submissions: 10 January 2024 | Viewed by 2635

Special Issue Editors

Dr. Muhammad Usman

E-Mail Website
Guest Editor
School of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2R3, Canada
Interests: thermochemical treatments (hydrothermal liquefaction, pyrolysis, advanced wet oxidation and steam explosion) of biomass/biowaste; biological treatment of wastewater; biogas production; synthesis of carbon rich materials (hydrochar, biochar), organic and inorganic pollutant degradation, adsorption, DIET and microbial study
Special Issues, Collections and Topics in MDPI journals
Dr. Muhammad Arslan

E-Mail Website
Guest Editor
Civil and Environmental Engineering Department, University of Alberta, Edmonton, AB, Canada
Interests: constructed wetlands; plant-bacteria interplay; microbial ecology; phytotechnologies; sustainability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Anaerobic digestion is an attractive and economical process for waste management and energy recovery. The performance of anaerobic digestion process is attributed to the hydrolysis rate of organics, microbial and metabolic activity. Nevertheless, the presence of several toxic pollutants and ammonia, along with the accumulation of volatile fatty acids, leads to the instability of the anaerobic digestion process. Thus, it is necessary that the anaerobic digestion process is improved for maximum resource recovery and energy. For this purpose, several chemical, biological, and physical approaches have been applied, but each technique has its own merits and demerits. For instance, the two-phase anaerobic digestion process demonstrates better performance in terms of stability and efficiency, along with high methane production. However, the two-phase anaerobic digestion process is extremely energy-intensive and costly. Therefore, it is timely to investigate how the anaerobic digestion process can be enhanced to contribute towards the circular economy and eco-friendly perspectives.

This Special Issue aims to attract both research and review articles on new approaches, recent developments, and the associated challenges related to the enhancement of the anaerobic digestion process. Pre-submission inquiries may be submitted to one of the editors for questions related to the relevance of the topic.

Dr. Muhammad Usman
Dr. Muhammad Arslan
Guest Editors

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

  • biogas 
  • bioreactors 
  • pretreatments 
  • microbial ecology 
  • hydrolysis 
  • direct interspecies electrons transformation 
  • conductive materials 
  • biomass/biowaste 
  • volatile fatty acid
  • municipal biosolids & wastewater treatment
  • organics & inorganics pollutants 
  • resource recovery 
  • integrated process 
  • life cycle assessment (LCA)

Published Papers (3 papers)

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Research

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Article
Exploring Anaerobic Digestion from Mesophilic to Thermophilic Temperatures—Operational and Microbial Aspects
by
Bettina Steiniger
,
Sebastian Hupfauf
,
Heribert Insam
and
Christian Schaum
Fermentation 2023, 9(9), 798; https://doi.org/10.3390/fermentation9090798 - 29 Aug 2023
Viewed by 740
Abstract
Digesters at water resource recovery facilities (WRRFs) operating at different temperatures within the mesophilic and thermophilic temperature range is a flexibilization concept to contribute to heat management. Four 25 L digesters were fed with sewage sludge from a municipal WRRF and were operated [...] Read more.
Digesters at water resource recovery facilities (WRRFs) operating at different temperatures within the mesophilic and thermophilic temperature range is a flexibilization concept to contribute to heat management. Four 25 L digesters were fed with sewage sludge from a municipal WRRF and were operated at 37, 43, 47 and 53 °C, respectively, to describe changes in the overall process performance and the microbiota. Specific methane yield and COD degradation rates were the highest at 47 °C, only being up to 7% higher compared with at 37 °C. The increase in pH and concentrations of NH4-N and PO4-P above 43 °C were statistically significant. The effect on the microbial community was strong, indicating both a constant specialization towards thermophilic organisms as well as a change from acetoclastic to hydrogenotrophic/methylotrophic methanogenesis. The influence of temperature on process-engineering and physicochemical aspects was rather small compared with the changes in the microbiota. Full article
(This article belongs to the Special Issue Modern Developments in Anaerobic Digestion Process: Resource Recovery and Energy Production)
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Article
The Role of Hydrochar in Promoting Methane Production from Anaerobic Digestion with Different Inocula
by
Jieyi Sun
,
Shicheng Zhang
and
Gang Luo
Fermentation 2023, 9(5), 433; https://doi.org/10.3390/fermentation9050433 - 29 Apr 2023
Cited by 1 | Viewed by 838
Abstract
Carbon materials, including hydrochar, can promote methane production from anaerobic digestion, and many previous studies have investigated the mechanism by analyzing changes in the microbial community. Based on the fact that the major functional microorganisms have varied in different studies, in order to [...] Read more.
Carbon materials, including hydrochar, can promote methane production from anaerobic digestion, and many previous studies have investigated the mechanism by analyzing changes in the microbial community. Based on the fact that the major functional microorganisms have varied in different studies, in order to investigate the effect of inocula on the final microbial composition and to compare the promotion effects of hydrochar on different microorganisms, this study introduced inocula from three distinct sources to anaerobic sequential batch reactors and analyzed the microbial community using 16S rRNA gene sequencing. Hydrochar showed significant promotion effects for all three of the inocula, by increasing microbial activity at high acid concentrations and/or by reducing butyrate accumulation. The dominant microorganisms in all reactors were Clostridium and Methanosarcina, and hydrochar increased the proportion of acetoclastic methanogens. The bacteria which were promoted by hydrochar (e.g., Aminicenantales, Anaerolineaceae and SBR1031 in anaerobic granular sludge and sludge digestate, as well as Lachnospiraceae in food waste digestate) only accounted for around 10%. The bacteria found to be involved in DIET in earlier studies were lacking in this study. It was speculated that hydrochar acted as an electron intermediate and supported microbial aggregation, while the possibility that hydrochar promoted DIET cannot be ruled out. Full article
(This article belongs to the Special Issue Modern Developments in Anaerobic Digestion Process: Resource Recovery and Energy Production)
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Article
Metagenomic Binning Revealed Microbial Shifts in Anaerobic Degradation of Phenol with Hydrochar and Pyrochar
by
Tao Luo
,
Jun He
,
Zhijian Shi
,
Yan Shi
,
Shicheng Zhang
,
Yan Liu
and
Gang Luo
Fermentation 2023, 9(4), 387; https://doi.org/10.3390/fermentation9040387 - 17 Apr 2023
Cited by 1 | Viewed by 725
Abstract
Phenolic compounds, which are difficultly degraded, are one of the main toxic threats faced in the anaerobic digestion (AD) process. It has previously been reported that hydrochar/pyrochar produced by the hydrothermal liquefaction/pyrolysis of biomass can enhance AD by promoting direct interspecific electron transfer [...] Read more.
Phenolic compounds, which are difficultly degraded, are one of the main toxic threats faced in the anaerobic digestion (AD) process. It has previously been reported that hydrochar/pyrochar produced by the hydrothermal liquefaction/pyrolysis of biomass can enhance AD by promoting direct interspecific electron transfer (DIET). The present study investigated the effects of different hydrochars and pyrochars on the anaerobic degradation of phenol and provided deep insights into the related micro-organisms at the species level through genome-centric metagenomic analysis. Compared with the control experiment, the addition of hydrochar and pyrochar shortened the lag time. However, hydrochar created a large increase in the maximum methane production rate (Rm) (79.1%) compared to the control experiments, while the addition of pyrochar decreased Rm. Metagenomic analysis showed that the addition of carbon materials affected the relative abundance of genes in the phenol anaerobic degradation pathway, as well as the species and relative abundance of phenol degrading micro-organisms. The relative abundance of key genes for phenol degradation, such as bsdB, bamB, oah, etc., under the action of hydrochar was higher than those under the action of pyrochar. In addition, hydrochar-enriched phenol degradation-related bacteria (Syntrophus aciditrophicus, etc.) and methanogen (Methanothrix soehngenii, etc.). These micro-organisms might improve the phenol degradation efficiency by promoting DIET. Therefore, hydrochar had a more significant effect in promoting anaerobic degradation of phenol. Full article
(This article belongs to the Special Issue Modern Developments in Anaerobic Digestion Process: Resource Recovery and Energy Production)
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