Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes
The two-phase olive pomace slurry (TOPS) is the major waste of the olive oil industry. Hydrothermal carbonisation (HTC) has been widely used for the conversion of TOPS into hydrochar, a solid biofuel. The HTC process also co-produces a liquid hydrolysate, whose valorisation has been scarcely investi...
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Elsevier
2025-07-01
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| Series: | Energy Conversion and Management: X |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590174525002600 |
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| author | Adnan Asad Karim Maria Lourdes Martínez-Cartas Manuel Cuevas-Aranda |
| author_facet | Adnan Asad Karim Maria Lourdes Martínez-Cartas Manuel Cuevas-Aranda |
| author_sort | Adnan Asad Karim |
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| description | The two-phase olive pomace slurry (TOPS) is the major waste of the olive oil industry. Hydrothermal carbonisation (HTC) has been widely used for the conversion of TOPS into hydrochar, a solid biofuel. The HTC process also co-produces a liquid hydrolysate, whose valorisation has been scarcely investigated. This study focussed on to investigate the composition (reducing sugars, total phenols, acetic acid and furfural) and use of the hydrolysate derived from conventional and microwave assisted HTC of TOPS to produce bioethanol by the fermentation carried out by Hansenula polymorpha, a non-conventional yeast. On the basis of holocellulose content (39.12 %) present in dry TOPS, the optimum conditions to achieve a maximum reducing sugar yield of 25.92 % through conventional HTC were 180 °C and 30 min. In the case of microwave HTC, the optimal conditions were 203 °C and 30 min to obtain a maximum reducing sugar yield of 27.88 %. The HTC also produced total phenols (up to 3.30 %), acetic acid (up to 3.33 %), and furfural (up to 1.96 %). In comparison to conventional HTC, the microwave HTC advantage was generation of lower concentrations of fermentation inhibitors. The H. polymorpha strain produced maximum overall bioethanol yield of 0.21 g g−1 in case of fermentation of liquid hydrolysate at 45 °C with inoculum concentrations of 0.8 g dm−3. These findings emphasised that the HTC of TOPS could be an alternative and promising method for co-production of reducing sugars, bioethanol and total phenols. |
| format | Article |
| id | doaj-art-cd6d8ff85cac4beabb1e23c9212d9c37 |
| institution | Matheson Library |
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| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| series | Energy Conversion and Management: X |
| spelling | doaj-art-cd6d8ff85cac4beabb1e23c9212d9c372025-07-16T04:56:21ZengElsevierEnergy Conversion and Management: X2590-17452025-07-0127101128Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processesAdnan Asad Karim0Maria Lourdes Martínez-Cartas1Manuel Cuevas-Aranda2Department of Chemical, Environmental and Materials Engineering, Linares Science & Technology Campus, University of Jaén, Avda. de la Universidad s/n, 23700 Linares, Spain; University Institute for Research in Olive Groves and Olive Oils (INUO), University of Jaén, Campus de las Lagunillas s/n, 23071 Jaén, Spain; Corresponding Author at: D-013, Department of Chemical, Environmental and Materials Engineering, Linares Science & Technology Campus (University of Jaén), Avenida de la Universidad, 23700, Linares (Jaén), Spain.Department of Chemical, Environmental and Materials Engineering, Linares Science & Technology Campus, University of Jaén, Avda. de la Universidad s/n, 23700 Linares, Spain; University Institute for Research in Olive Groves and Olive Oils (INUO), University of Jaén, Campus de las Lagunillas s/n, 23071 Jaén, SpainDepartment of Chemical, Environmental and Materials Engineering, Linares Science & Technology Campus, University of Jaén, Avda. de la Universidad s/n, 23700 Linares, Spain; University Institute for Research in Olive Groves and Olive Oils (INUO), University of Jaén, Campus de las Lagunillas s/n, 23071 Jaén, SpainThe two-phase olive pomace slurry (TOPS) is the major waste of the olive oil industry. Hydrothermal carbonisation (HTC) has been widely used for the conversion of TOPS into hydrochar, a solid biofuel. The HTC process also co-produces a liquid hydrolysate, whose valorisation has been scarcely investigated. This study focussed on to investigate the composition (reducing sugars, total phenols, acetic acid and furfural) and use of the hydrolysate derived from conventional and microwave assisted HTC of TOPS to produce bioethanol by the fermentation carried out by Hansenula polymorpha, a non-conventional yeast. On the basis of holocellulose content (39.12 %) present in dry TOPS, the optimum conditions to achieve a maximum reducing sugar yield of 25.92 % through conventional HTC were 180 °C and 30 min. In the case of microwave HTC, the optimal conditions were 203 °C and 30 min to obtain a maximum reducing sugar yield of 27.88 %. The HTC also produced total phenols (up to 3.30 %), acetic acid (up to 3.33 %), and furfural (up to 1.96 %). In comparison to conventional HTC, the microwave HTC advantage was generation of lower concentrations of fermentation inhibitors. The H. polymorpha strain produced maximum overall bioethanol yield of 0.21 g g−1 in case of fermentation of liquid hydrolysate at 45 °C with inoculum concentrations of 0.8 g dm−3. These findings emphasised that the HTC of TOPS could be an alternative and promising method for co-production of reducing sugars, bioethanol and total phenols.http://www.sciencedirect.com/science/article/pii/S2590174525002600Olive wasteHydrothermal carbonisationHigh-temperature fermentationNon-conventional yeastBioproducts |
| spellingShingle | Adnan Asad Karim Maria Lourdes Martínez-Cartas Manuel Cuevas-Aranda Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes Energy Conversion and Management: X Olive waste Hydrothermal carbonisation High-temperature fermentation Non-conventional yeast Bioproducts |
| title | Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes |
| title_full | Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes |
| title_fullStr | Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes |
| title_full_unstemmed | Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes |
| title_short | Bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non-conventional yeast-based fermentation processes |
| title_sort | bioethanol manufacturing from industrial olive pomace slurry through integrated hydrothermal carbonisation and non conventional yeast based fermentation processes |
| topic | Olive waste Hydrothermal carbonisation High-temperature fermentation Non-conventional yeast Bioproducts |
| url | http://www.sciencedirect.com/science/article/pii/S2590174525002600 |
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