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Anaerobic Digestion and Biogas Production as a Renewable Energy Source with Increasing Potential

A special issue of Sustainability (ISSN 2071-1050).

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 3576

Special Issue Editor


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Guest Editor
BioenergieBeratungBornim
Interests: biological optimization; digestate treatment; feedstock treatment; combining anaerobic digestion and further product generation

Special Issue Information

Dear Colleagues,

Anaerobic digestion of organic material and, hence, biogas production was recognized as a renewable energy source already in the middle of the last century. While there was an accelerating development of household scale biogas plants, the development of industrial-scale applications was inhibited and gathered pace in the beginning of this century. Together with the development of industrial-scale biogas plants, research in anaerobic digestion has increased tremendously. Today, research is abundant in all fields of anaerobic digestion, biogas application, and even new fields of additional product generation all over the world. This research has opened up new fields for the production of biogas and co-products, for the application of biogas as a renewable source, and for the widening of materials suitable as feedstock for anaerobic digestion.

This Special Issue will gather recent original research in all relevant fields of anaerobic digestion and biogas production with a focus on feedstock, optimizing the anaerobic digestion process, treatment of digestate, and new co-products. A special focus will be given to the transition from laboratory-scale to pilot plant application. 

Suitable topics include but are not limited to the following:

  • Anaerobic digestion of agricultural wastes and residues;
  • From lab-scale experiments, pilot plant and practice-scale application;
  • New co-products of anaerobic digestion, e.g., succinic acid;
  • Digestate treatment to increase fertilizer value and handling of it;
  • Feedstock treatment to enhance digestibility and handling of feedstock;
  • THG balance of biogas production and application.

Dr. Matthias Ploechl
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. Sustainability is an international peer-reviewed open access semimonthly 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 2400 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

  • anaerobic digestion of agricultural wastes and residues
  • lab-scale experiments
  • pilot plant and practice-scale application
  • co-products of anaerobic digestion
  • digestate treatment
  • feedstock treatment
  • THG balance

Published Papers (1 paper)

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Research

27 pages, 17794 KiB  
Article
Critical Analysis of Methods Adopted for Evaluation of Mixing Efficiency in an Anaerobic Digester
by Buta Singh, Narinder Singh, Zsolt Čonka, Michal Kolcun, Zoltán Siménfalvi, Zsolt Péter and Zoltán Szamosi
Sustainability 2021, 13(12), 6668; https://0-doi-org.brum.beds.ac.uk/10.3390/su13126668 - 11 Jun 2021
Cited by 6 | Viewed by 3134
Abstract
The effect of slurry mixing in an anaerobic digester on biogas production was intensively studied in the last few years. This subject is still debatable due to fact that this process involves three phases, solid-gas-liquid, along with the involvement of microbes during biochemical [...] Read more.
The effect of slurry mixing in an anaerobic digester on biogas production was intensively studied in the last few years. This subject is still debatable due to fact that this process involves three phases, solid-gas-liquid, along with the involvement of microbes during biochemical reactions, which are highly vulnerable to changes in hydrodynamic shear stresses and mixing conditions. Moreover, the complexity in the direction of optimization of mixing magnifies due to the implication of both fluid mechanics and biochemical engineering to study the effect of mixing in anaerobic digestion (AD). The effect of mixing on AD is explored using recent literature and theoretical analysis, concentrating on the multi-phase and multi-scale aspects of AD. The tools and methods available to experimentally quantify the function of mixing on both the global and local scales are summarized in this study. The major challenge for mixing in an anaerobic digester is to minimize dead zones and maintain uniform distribution of viscosity and shear at low mixing intensities without disrupting the microbial flocs and syntrophic relationships between the bacteria during the AD process. This study is a critical analysis of various techniques and approaches adopted by researchers to evaluate the effectiveness of mixing regimes and mixing equipment. Most studies describe biogas production performance and hydrodynamic characteristics of the digesters separately, but the evaluation of mixing requires interdisciplinary experts, which include mechanical engineers, microbiologists and hydrodynamic experts. Through this review, the readers will be guided through intensive literature regarding agitation, the best possible way to scrutinize the agitation problems and the approach to answering the question “why is the optimization of mixing in an anaerobic digester still a debatable subject?”. Full article
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