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Anaerobic Digestion Process: Design, Optimization and Application
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Anaerobic Digestion Process: Design, Optimization and Application

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Biological Processes and Systems".

Deadline for manuscript submissions: 2 August 2024 | Viewed by 646

Special Issue Editor

Dr. Gregor Drago Zupančič

E-Mail Website
Guest Editor
Sustainable Technologies Development Centre, Croteh, 10020 Zagreb, Croatia
Interests: anaerobic digestion; sustainable technologies; waste management; food waste, wastewater

Special Issue Information

Dear Colleagues,

The accumulation of waste has nowadays been an ongoing problem. Because of the said reasons, waste management is a field that constantly seeks improvement. Anaerobic digestion (AD) is an interesting approach to waste management since it produces biogas, a gaseous mixture of primarily methane and CO2, which can be used in various industrial and other processes. Waste, especially organic, such as food and beverage waste, is characterized by high biodegradability and is a suitable substrate for anaerobic digestion. Furthermore, the fact that anaerobic digestion in this case utilizes food waste, it can be concluded that AD in this case plays a dual part in improving the sustainability of the industry: (1) it improves the management of the industrial waste and (2) it generates the production of the energy source – biogas. Also, indirectly, AD, in this case, uses waste from the food and beverage industry, which does not endanger resources needed for food production.

The topics within the scope of the issue are mainly the following, but not limited to this:

  • Anaerobic digestion of waste materials, waste, and by-products from the food and beverage industry, as well as agriculture are included
  • Pre-treatment of substrates used in anaerobic digestion
  • Unification of anaerobic digestion with various other processes and applications (eg. Incineration)
  • Inhibition effects in anaerobic digestion
  • Characterization and quality of produced digestate

Dr. Gregor Drago Zupančič
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. Processes 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 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
  • food waste
  • beverage waste
  • digestate
  • food by-products
  • waste management
  • wastewater treatment
  • pre-treatment

Published Papers (2 papers)

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Research

13 pages, 965 KiB  
Article
The Influence of Polyphenolic Compounds on Anaerobic Digestion of Pepper Processing Waste during Biogas and Biomethane Production
by Gregor Drago Zupančič, Anamarija Lončar, Jasmina Ranilović, Drago Šubarić and Mario Panjičko
Processes 2024, 12(5), 913; https://doi.org/10.3390/pr12050913 (registering DOI) - 29 Apr 2024
Abstract
Pepper processing waste has the potential to be used as a substrate in the process of anaerobic digestion, but because of its high polyphenol content, certain limitations are expected. During the determination of the biodegradability of pepper samples, a biogas potential of 687 [...] Read more.
Pepper processing waste has the potential to be used as a substrate in the process of anaerobic digestion, but because of its high polyphenol content, certain limitations are expected. During the determination of the biodegradability of pepper samples, a biogas potential of 687 L/kg DM was observed, as well as a biomethane potential of 401 L/kg DM. While both the testing of biodegradability and the process in the pilot scale progressed, it was observed that total polyphenol content in both cases decreased. Also, as far as individual polyphenols during the process in the pilot scale are concerned, it can be observed that at the end of the process no procyanidin A2, epicatechin, myricetin, and quercetin were detected. The observed concentration of the ferulic acid on the last day of the process was 0.09 µg/g. Finally, it can be concluded that the presence of polyphenols did not significantly affect the biogas potential of pepper waste. Due to its relatively stable biogas production, as far as biogas production on the pilot scale is concerned, it can be concluded that pepper processing waste has the potential to be used as a substrate for biogas production. Full article
(This article belongs to the Special Issue Anaerobic Digestion Process: Design, Optimization and Application)
12 pages, 2138 KiB  
Article
Optimizing the Mixing Ratios of Source-Separated Organic Waste and Thickened Waste Activated Sludge in Anaerobic Co-Digestion: A New Approach
by Anahita Rabii, Ahmed El Sayed, Amr Ismail, Saad Aldin, Yaser Dahman and Elsayed Elbeshbishy
Processes 2024, 12(4), 794; https://doi.org/10.3390/pr12040794 - 15 Apr 2024
Viewed by 343
Abstract
Anaerobic co-digestion (AnCoD) presents several advantages over conventional mono-digestion. Various factors can impact the efficiency of the co-digestion process, including the mixing ratio of the feedstocks. This study primarily investigates the effects of different mixing ratios on methane production during the co-digestion of [...] Read more.
Anaerobic co-digestion (AnCoD) presents several advantages over conventional mono-digestion. Various factors can impact the efficiency of the co-digestion process, including the mixing ratio of the feedstocks. This study primarily investigates the effects of different mixing ratios on methane production during the co-digestion of source-separated municipal organic waste (SSO) with thickened waste activated sludge (TWAS). While the C/N or COD/N ratio has generally been used for optimizing the mixing ratios of co-digested feedstocks, a new approach is introduced in this study to evaluate the effects of the lipid, protein, and carbohydrate (L:P:C) ratios on the efficiency of AnCoD with respect to methane production, kinetics, and synergism at mixing ratios of TWAS:SSO of 10:90, 30:70, 50:50, 70:30, and 10:90. AnCoD improved methane production and kinetics relative to TWAS at all mixing ratios, the highest of which was at the 10:90 ratio, corresponding to a methane yield, maximum methane production rate, and an L:P:C ratio of 353 mL CH4/g COD, 25 mL CH4/g COD/d, and 8:1:18, respectively. Improvements in methane yields and kinetics due to synergy were evident at all mixing ratios, with improvements in methane yields ranging from 11 to 23% and improvements in kinetics ranging from 18 to 58%. Improvements in methane yields and kinetics were insensitive to the feedstock composition beyond the 50:50 mixing ratio. Full article
(This article belongs to the Special Issue Anaerobic Digestion Process: Design, Optimization and Application)
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