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Processes
Special Issues
Integrated Process Design and Development of Biorefinery
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Integrated Process Design and Development of Biorefinery

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

Deadline for manuscript submissions: closed (15 April 2024) | Viewed by 2362

Special Issue Editors

Prof. Dr. Leandro V. A. Gurgel

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Guest Editor
Chemistry Department, Institute of Exact and Biological Sciences, Federal University of Ouro Preto, Ouro Preto 35400-000, MG, Brazil
Interests: biorefinery; bioenergy; pretreatment; bioethanol; enzymatic hydrolysis; bioproducts; water treatment; adsorption
Dr. Oscar Fernando Herrera Adarme

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Guest Editor
School of Agricultural Engineering, University of Campinas, Campinas 13083-875, SP, Brazil
Interests: integrated biorefineries; techno-economic assessment; life cycle assessment; agro-industrial wastes
Dr. Aline Gomes de Oliveira Paranhos

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Guest Editor
Graduate Program in Environmental Engineering, Federal University of Ouro Preto, Ouro Preto 35400-000, MG, Brazil
Interests: biomass conversion; anaerobic biodegradation; agro-industrial wastes; integrated biorefineries
Dr. Liliane Catone Soares

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Guest Editor
Department of Chemistry, Institute of Exact and Biological Sciences (ICEB), Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro s/n, Bauxita, Ouro Preto 35400-000, MG, Brazil
Interests: soil chemistry; analytical chemistry; environmental chemistry; adsorption; heavy metals; mercury; arsenic; biomass

Special Issue Information

Dear Colleagues,

The global demand for energy and products is concomitant with population growth and its development and improvement. Nowadays, the world is facing numerous difficulties in guaranteeing sustainable life in society and, therefore, feasible strategies from technical, economic, and environmental points of view are needed to overcome these problems. In this sense, renewable feedstock as biomass combined with optimum conversion pathways and methods can play a fundamental role for circular economy approaches. In fact, two key conversion processes, thermochemical and biological, can be used to produce energy and products from biomass, approaching the biorefinery concept. Thus, the major challenges facing design systems are minimizing energy consumption and potential environmental impacts through life-cycle assessment and process integration/optimization between different conversion platforms.

This Special Issue is focused on methods and applications, combining techno-economic and life-cycle assessments for biorefining processes, which allows the optimum design and management of biorefineries. Furthermore, special attention will be given to multiproduct biorefinery applications, as well as future developments and trends.

Prof. Dr. Leandro V. A. Gurgel
Dr. Oscar Fernando Herrera Adarme
Dr. Aline Gomes de Oliveira Paranhos
Dr. Liliane Catone Soares
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. 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

  • biorefinery
  • circular bioeconomy
  • agro-industrial wastes
  • integrated biorefinery
  • life cycle assessment
  • techno-economic assessment
  • bioenergy
  • value added products

Published Papers (2 papers)

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Research

11 pages, 1884 KiB  
Article
Enhanced Production of Clean Fermentable Sugars by Acid Pretreatment and Enzymatic Saccharification of Sugarcane Bagasse
by Mario Alberto Yaverino-Gutierrez, Lucas Ramos, Jesús Jiménez Ascencio and Anuj Kumar Chandel
Processes 2024, 12(5), 978; https://doi.org/10.3390/pr12050978 - 10 May 2024
Viewed by 341
Abstract
Sugarcane bagasse (SCB), an agro-industrial byproduct generated by a sugar mill, holds a substantial carbohydrate content of around 70 wt.%, comprising cellulose and hemicellulose. Saccharification plays a pivotal role in the conversion of SCB into second-generation (2G)-ethanol and valuable compounds, which is significantly [...] Read more.
Sugarcane bagasse (SCB), an agro-industrial byproduct generated by a sugar mill, holds a substantial carbohydrate content of around 70 wt.%, comprising cellulose and hemicellulose. Saccharification plays a pivotal role in the conversion of SCB into second-generation (2G)-ethanol and valuable compounds, which is significantly aided by thermochemical pretreatments. In this study, SCB underwent diluted sulfuric acid pretreatment (2% H2SO4, 80 rpm, 200 °C, 20 min), resulting in the removal of 77.3% of the xylan. The hemicellulosic hydrolysate was analyzed to identify the sugars and degraded products acting as microbial inhibitors. The acid hydrolysate showed a xylose yield of 68.0% (16.4 g/L) and a yield of 3.8 g/L of acetic acid. Afterward, the hemicellulosic hydrolysate was concentrated 2.37 times to obtain a xylose-rich stream (39.87 g/L). The sequential detoxification, employing calcium oxide and activated carbon, removed the inhibitory compounds, including acetic acid, while preserving the xylose at 38.10 g/L. The enzymatic saccharification of cellulignin at 5% and 10% of the total solids (TSs) yielded comparable reducing sugar (RS) yields of 47.3% (15.2 g/L) and 47.4% (30.4 g/L), respectively, after 96 h, employing a 10 FPU/g enzyme loading of Cellic® CTec3 (Novozymes Inc. Parana, Brazil). In summary, these findings outline an integrated green chemistry approach aimed at addressing the key challenges associated with pretreatment, concentration, detoxification, and enzymatic hydrolysis to produce fermentable sugars. Full article
(This article belongs to the Special Issue Integrated Process Design and Development of Biorefinery)
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17 pages, 2061 KiB  
Article
Enhancing Biobased Volatile Fatty Acids Production from Olive Mill Solid Waste by Optimization of pH and Substrate to Inoculum Ratio
by Yasmim A. da Fonseca, Adonai B. de Camargos, Gustavo S. M. Gomes, P. Fregulia, Silvana Q. Silva, Leandro V. A. Gurgel and Bruno E. L. Baêta
Processes 2023, 11(2), 338; https://doi.org/10.3390/pr11020338 - 20 Jan 2023
Cited by 2 | Viewed by 1682
Abstract
The pH and substrate-to-inoculum ratio (S/I) are important parameters in the anaerobic fermentation of agroindustrial residues, and therefore the optimization of these two parameters is needed for a stable, efficient, and sustainable reactor operation. In this work, the parameters pH (5–9) [...] Read more.
The pH and substrate-to-inoculum ratio (S/I) are important parameters in the anaerobic fermentation of agroindustrial residues, and therefore the optimization of these two parameters is needed for a stable, efficient, and sustainable reactor operation. In this work, the parameters pH (5–9) and S/I (0.5–3 gVS gVS−1) were optimized to produce biobased volatile fatty acids (VFAs) from hydrothermally pretreated olive mill solid waste (HPOMSW). The response variables evaluated in the Doehlert design were total VFAs concentration (tVFAs) (mg L−1) and amounts (%) of isobutyric, butyric, isovaleric, and valeric acids on the VFAs profile. The pH was the variable that most influenced the mixed culture fermentation of HPOMSW, proving to be a key parameter in the process. Microbial community analyses of conditions 1 (S/I = 3 gVS gVS−1 and pH = 7) and 4 (S/I = 1.13 gVS gVS−1 and pH = 5) showed that Proteobacteria and Firmicutes accounted for more than 87% of the total microorganisms identified for both conditions. In addition, the second-order model best fitted the experimental data for the VFAs production at the desirable condition (S/I = 3 gVS gVS−1 and pH = 8). Full article
(This article belongs to the Special Issue Integrated Process Design and Development of Biorefinery)
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