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Energies
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Environmentally Friendly Biofuel Production: 2nd Edition
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Environmentally Friendly Biofuel Production: 2nd Edition

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: 25 August 2025 | Viewed by 2739

Special Issue Editors

Prof. Dr. Wojciech Czekała

E-Mail Website
Guest Editor
Department of Biosystems Engineering, Poznań Uniwersity of Life Sciences, Wojska Polskiego 50, 60-627 Poznań, Poland
Interests: waste; biomass; circular economy; sustainable development; energy; biofuels; compost; biogas
Special Issues, Collections and Topics in MDPI journals
Dr. Jakub Frankowski

E-Mail Website
Guest Editor
Department of Bioeconomy, Institute of Natural Fibres and Medicinal Plants—National Research Institute, Wojska Polskiego 71B, 60-630 Poznań, Poland
Interests: environmental science; waste management; agriculture; bioengineering; chemical engineering; bioprocess engineering; fermentation technology; biofuel production; green technology; bioeconomy; circular economy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The changes in environmental and climatic conditions, as well as economic growth and the increase in energy consumption, have led to an intensification of research regarding the ability of alternative fuels to replace fossil fuels. The dynamic development of alternative energy sources and the use of waste and biomass for the production of bioenergy could improve the energy mix. In addition, it is worth searching for new, less popular and prospective solutions, as well as various solutions based on the principles of bioeconomy.

This Special Issue aims to present and disseminate recent advances related to bioprocess engineering, sustainable development, and the circular economy, with regard to the environmentally friendly production of biofuel.

The scope of this Special Issue includes, but is not limited to, the following:

  • All aspects of energy crop cultivation and the processing of harvested biomass into bioenergy.
  • Technical and economic aspects of biofuel production efficiency.
  • Bioprocess engineering and its application in a circular economy.
  • Novel applications of biofuel production according to sustainable development.
  • Advanced technologies for the conversion of waste into biofuels.

Prof. Dr. Wojciech Czekała
Dr. Jakub Frankowski
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. Energies 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 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

  • bioprocess engineering
  • biomass
  • biofuels
  • biogas
  • agriculture
  • renewable energy
  • waste management
  • bioeconomy
  • circular economy
  • sustainable development

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Published Papers (3 papers)

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Research

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14 pages, 1572 KiB  
Article
The Influence of Drying Sewage Sludge with the Addition of Walnut Shells on Changes in the Parameters and Chemical Composition of the Mixture
by Sebastian Kujawiak, Małgorzata Makowska, Bogusława Waliszewska, Damian Janczak, Jakub Brózdowski, Wojciech Czekała and Artur Zyffert
Energies 2024, 17(18), 4701; https://doi.org/10.3390/en17184701 - 21 Sep 2024
Viewed by 1141
Abstract
One method of preparing sludge for management and use is solar drying. To intensify the drying process, natural lignocellulosic additives can be used to alter the structure of the sludge and accelerate water evaporation. Light, hard materials with low absorption capacity are best [...] Read more.
One method of preparing sludge for management and use is solar drying. To intensify the drying process, natural lignocellulosic additives can be used to alter the structure of the sludge and accelerate water evaporation. Light, hard materials with low absorption capacity are best suited for this purpose, e.g., walnut shells, which are unused waste. The aim of the study was to determine the impact of the evaluation of walnut shells on the sludge drying process and to assess the impact of the drying process on the chemical, physical, and fuel properties of the additive. The moisture content, crushing strength, chemical composition, and physical and fuel properties of mixtures were determined. A small addition of walnut shells (25%) was found to accelerate the drying process even in winter and spring (up to 30 days) compared to sludge without additives. Walnut shells retain their chemical composition and strength despite unfavourable conditions and a chemically aggressive environment, indicating they may be reused. The mixture containing sewage sludge and walnut shells has a calorific value of 15.6 MJ/kg, which is similar to wood; it is also fully biodegradable and suitable as a fertiliser to improve soil structure, as it contains approx. 80–90% DM (including approx. 40% carbon, 3% nitrogen, and other elements, such as phosphorus and potassium.) Full article
(This article belongs to the Special Issue Environmentally Friendly Biofuel Production: 2nd Edition)
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Review

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26 pages, 732 KiB  
Review
Innovative Method for Biomethane Production Based on a Closed Cycle of Biogas Upgrading and Organic Substrate Pretreatment—Technical, Economic, and Technological Fundamentals
by Joanna Kazimierowicz, Marcin Dębowski and Marcin Zieliński
Energies 2025, 18(5), 1033; https://doi.org/10.3390/en18051033 - 20 Feb 2025
Viewed by 527
Abstract
This study presents the technological, technical, and economic basis of the solution developed by the authors for the production of biomethane based on the pretreatment of organic substrates at low temperature using solidified CO2 captured during biogas upgrading in a closed cycle [...] Read more.
This study presents the technological, technical, and economic basis of the solution developed by the authors for the production of biomethane based on the pretreatment of organic substrates at low temperature using solidified CO2 captured during biogas upgrading in a closed cycle (TeCH4BiogasUp). TeCH4BiogasUp integrates the disintegration of organic substrates, biogas upgrading and the sequestration and utilization of CO2 in a closed cycle. The multifunctional and hybrid nature of TeCH4BiogasUp sets it apart from other available solutions that only perform selected, individual technological processes. This is a significant advantage and a competitive market edge; however, it also poses challenges in conducting comparative analyses with existing solutions on the market. The technology has been compared with traditional substrate pretreatment techniques and biogas purification technologies. Considering the origin of the solidified CO2, this method can be regarded as material recycling, which aligns fully with the principles of the circular economy. This technology supports the reduction in CO2 emissions by capturing the CO2 and introducing it into the closed process. This novel approach to the production and utilization of solidified CO2 largely overcomes previous limitations associated with the low profitability of the process. TeCH4BiogasUp could serve as a viable alternative to other methods, particularly in light of economic trends and the imperative to reduce CO2 emissions through the development of renewable energy sources. Full article
(This article belongs to the Special Issue Environmentally Friendly Biofuel Production: 2nd Edition)
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18 pages, 1406 KiB  
Review
Production Efficiency of Advanced Liquid Biofuels: Prospects and Challenges
by Tamás Mizik, Christian Barika Igbeghe and Zsuzsanna Deák
Energies 2025, 18(4), 1008; https://doi.org/10.3390/en18041008 - 19 Feb 2025
Viewed by 532
Abstract
Renewable sources are becoming more critical in light of global warming and the recent energy crisis. As a renewable energy source, biofuels may play an essential role in this process, especially in the transport sector. Advanced biofuels provide a great opportunity, as their [...] Read more.
Renewable sources are becoming more critical in light of global warming and the recent energy crisis. As a renewable energy source, biofuels may play an essential role in this process, especially in the transport sector. Advanced biofuels provide a great opportunity, as their potential feedstocks do not compete with food production. Based on a systematic literature review, this study aims to provide a comprehensive overview of the prospects and challenges of advanced liquid biofuels. Out of the identified 508 articles, 188 were abstract-screened, providing 67 articles for in-depth screening. Finally, 57 articles were reviewed. Although advanced biofuels are not yet economically viable, it is evident that every step of the production process can be optimized. Moreover, technological advancements, such as the use of novel catalysts and co-catalysts, nanotechnology, and genetic and metabolic engineering, offer great opportunities for enhanced production efficiency, which is key for their production to be profitable. Full article
(This article belongs to the Special Issue Environmentally Friendly Biofuel Production: 2nd Edition)
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