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Advances in Bioconversion of Lignocellulose to Fuels, Chemicals, and Biomaterials

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

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 4662

Special Issue Editors


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Guest Editor
Department of Biology, Hood College, 401 Rosemont Avenue, Frederick, MD 21701, USA
Interests: biofuels; fermentation; enzyme catalysis; agricultural and biological sciences; biochemical conversion
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Agricultural Engineering Technology, University of Wisconsin, River Falls, WI 54022, USA
Interests: lignocellulosic biofuels and chemicals; biomass conversion; bioprocess engineering; food process engineering; renewable energy; enzyme technology; process simulation

Special Issue Information

Dear colleagues,

We are pleased to invite you to submit an original research article or a review paper to this Special Issue of Energies on the topic of “Bioconversion of Lignocellulose to Fuels, Chemicals, and Biomaterials”.

The conversion of lignocellulosic biomass to fuels and high-value chemicals to replace fossil-derived counterparts has been the subject of intense research efforts for many years due to the rising concern about the cost of CO2 emissions and climate change. Despite substantial efforts and impressive progress in the past, the recalcitrance of lignocellulosic biomass remains a major hurdle in the development and operation of cost-effective lignocellulosic biorefineries. Among the various approaches applied in lignocellulose conversion technologies, the biological (or biochemical) conversion route has advantages of high specificity, low energy or chemical consumption, and low environmental pollution. The major challenges in the biological conversion of lignocellulose mainly originate from the recalcitrant and heterogeneous nature of the feedstock, which makes a complete understanding of the mechanisms behind the biological conversion of lignocellulose difficult. Bioconversion and biotechnological aspects of lignocellulose degradation can only advance by taking into consideration the inherent nature of lignocellulosic biomass. Some of the major issues arising from the recalcitrance of lignocellulosic biomass include low conversion efficiencies, the need for costly pretreatment or preprocessing steps, the multiplicity of enzymes required to degrade biomass, and the release of inhibitory compounds in the process, all of which may add costs to the process.

This Special Issue would like to encourage original contributions regarding recent developments, technological advances, and ideas in bioconversion of lignocellulosic biomass to fuels, chemicals, and bioproducts. Research involving numerical studies, recent developments, and the current state of the art and emerging technologies in lignocellulose bioconversion is welcome. Studies of understanding lignocellulose substrate characteristics and complexity, key factors for enzymatic or microbial conversion of lignocellulose, and improving accessibility in enzymatic hydrolysis of lignocellulosic substrates are also encouraged. Additional potential topics related to the biological conversion of lignocellulose include, but are not limited to, the following: pretreatment technology, lignin valorization, protein engineering, recombinant DNA technology, metabolic engineering, genetic engineering of plants, enzymatic kinetic studies, enzyme immobilizations, reaction engineering, consolidated bioprocessing, anaerobic digestion, strain development, and process simulation.

Dr. Daehwan Kim
Prof. Dr. Youngmi Kim
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

  • Lignocellulose
  • Lignin
  • Bioconversion
  • Biotechnology for lignocellulose
  • Biochemical conversion
  • Microbial conversion
  • Anaerobic digestion
  • Enzymes
  • Pretreatment
  • Enzymatic hydrolysis
  • Cellulases
  • Enzyme inhibition
  • Genetic and metabolic engineering
  • Lignocellulose degrading enzymes
  • Fermentation
  • Fermentation inhibition
  • Catalysts
  • Lignocellulose recalcitrance
  • Biofuels
  • Biogas
  • Bioplastics
  • Biohydrogen
  • Value-added products from lignocellulose
  • Chemicals from lignocellulose
  • Lignocellulosic biorefineries

Published Papers (2 papers)

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Research

11 pages, 700 KiB  
Article
Exploring Natural Fermented Foods as a Source for New Efficient Thermotolerant Yeasts for the Production of Second-Generation Bioethanol
by Mouna Aouine, Doha Elalami, Saad Ibnsouda Koraichi, Abdellatif Haggoud and Abdellatif Barakat
Energies 2022, 15(14), 4954; https://0-doi-org.brum.beds.ac.uk/10.3390/en15144954 - 06 Jul 2022
Cited by 6 | Viewed by 1288
Abstract
Considering the cost-effectiveness of bioethanol production at high temperatures, there is an enduring need to find new thermotolerant ethanologenic yeasts. In this study, a total of eighteen thermotolerant yeasts were isolated from various natural fermented products in Morocco. Ethanol production using 50 g/L [...] Read more.
Considering the cost-effectiveness of bioethanol production at high temperatures, there is an enduring need to find new thermotolerant ethanologenic yeasts. In this study, a total of eighteen thermotolerant yeasts were isolated from various natural fermented products in Morocco. Ethanol production using 50 g/L glucose or 50 g/L xylose as the sole carbon source revealed potential yeasts with high productivities and volumetric ethanol productivities at high temperatures. Based on molecular identification, the selected thermotolerant fermentative isolates were affiliated with Pichia kudriavzevii, Kluyveromyces marxianus, and Kluyveromyces sp. During the simultaneous saccharification and fermentation of lignocellulosic biomass at a high temperature (42 °C), the designated yeast P. kudriavzevii YSR7 produced an ethanol concentration of 22.36 g/L, 18.2 g/L and 6.34 g/L from 100 g/L barley straw (BS), chickpea straw (CS), and olive tree pruning (OTP), respectively. It also exhibited multi-stress tolerance, such as ethanol, acetic acid, and osmotic tolerance. Therefore, the yeast P. kudriavzevii YSR7 showed promising attributes for biorefinery-scale ethanol production in the future. Full article
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20 pages, 14366 KiB  
Article
Co-Digestion of Rice Straw with Cow Manure in an Innovative Temperature Phased Anaerobic Digestion Technology: Performance Evaluation and Trace Elements
by Furqan Muhayodin, Albrecht Fritze, Oliver Christopher Larsen, Marcel Spahr and Vera Susanne Rotter
Energies 2021, 14(9), 2561; https://0-doi-org.brum.beds.ac.uk/10.3390/en14092561 - 29 Apr 2021
Cited by 8 | Viewed by 2761
Abstract
Rice straw is an agricultural residue produced in abundant quantities. Open burning and plowing back the straw to the fields are common practices for its disposal. In-situ incorporation and burning cause emissions of greenhouse gas and particulate matter. Additionally, the energy potential of [...] Read more.
Rice straw is an agricultural residue produced in abundant quantities. Open burning and plowing back the straw to the fields are common practices for its disposal. In-situ incorporation and burning cause emissions of greenhouse gas and particulate matter. Additionally, the energy potential of rice straw is lost. Anaerobic digestion is a technology that can be potentially used to utilize the surplus rice straw, provide renewable energy, circulate nutrients available in the digestate, and reduce greenhouse gas emissions from rice paddies. An innovative temperature phased anaerobic digestion technology was developed and carried out in a continuous circulating mode of mesophilic and hyperthermophilic conditions in a loop digester (F1). The performance of the newly developed digester was compared with the reference digester (F2) working at mesophilic conditions. Co-digestion of rice straw was carried out with cow manure to optimize the carbon to nitrogen ratio and to provide the essential trace elements required by microorganisms in the biochemistry of methane formation. F1 produced a higher specific methane yield (189 ± 37 L/kg volatile solids) from rice straw compared to F2 (148 ± 36 L/kg volatile solids). Anaerobic digestion efficiency was about 90 ± 20% in F1 and 70 ± 20% in F2. Mass fractions of Fe, Ni, Co, Mo, Cu, and Zn were analyzed over time. The mass fractions of Co, Mo, Cu, and Zn were stable in both digesters. While mass fractions of Fe and Ni were reduced at the end of the digestion period. However, no direct relationship between specific methane yield and reduced mass fraction of Fe and Ni was found. Co-digestion of rice straw with cow manure seems to be a good approach to provide trace elements except for Se. Full article
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