BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate
Food wastes represent one third of all food produced worldwide. It is crucial to both prevent the production of food waste and recover the wasted fraction with the aim to valorizing it. In this context, the conversion of the organic fraction of municipal solid wastes (OFMSW) into bioH<sub>2<...
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MDPI AG
2022-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/9/4240 |
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| author | Inês Martins Elena Surra Márcia Ventura Nuno Lapa |
| author_facet | Inês Martins Elena Surra Márcia Ventura Nuno Lapa |
| author_sort | Inês Martins |
| collection | DOAJ |
| description | Food wastes represent one third of all food produced worldwide. It is crucial to both prevent the production of food waste and recover the wasted fraction with the aim to valorizing it. In this context, the conversion of the organic fraction of municipal solid wastes (OFMSW) into bioH<sub>2</sub> by dark fermentation (DF) is an important technology to valorize these wastes into renewable fuel. Nevertheless, the DF of OFMSW needs to be optimized for critical operational parameters. The main purposes of this study were to investigate (i) the effect of HRT during continuous bioH<sub>2</sub> production through DF and (ii) the effect of organic loading rate (OLR) ruled by HRT. In this work, three HRTs (4, 5, and 6 d) were tested in a mesophilic continuous stirred-tank reactor (CSTR). The HRTs of 4, 5, and 6 days, corresponding to OLRs of 23.6, 18.0, and 10.6 g volatile solids (VS)·L<sup>−1</sup>·d<sup>−1</sup>, respectively, showed bioH<sub>2</sub> yields of 8.48, 18.2, and 1.64 L·kg<sup>−1</sup> VS<sub>influent</sub> with an H<sub>2</sub> content of approximately 25, 32, and 5% <i>v</i>/<i>v</i>, respectively. An accumulation of volatile fatty acids (VFAs) was registered with the decrease in HRT, causing a decrease in bioH<sub>2</sub> production. The 5 d HRT was the most favorable condition. |
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| last_indexed | 2024-03-10T04:22:40Z |
| publishDate | 2022-04-01 |
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| series | Applied Sciences |
| spelling | doaj.art-2d4cfa9699b54ffa9d23ea33368483ab2023-11-23T07:46:13ZengMDPI AGApplied Sciences2076-34172022-04-01129424010.3390/app12094240BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading RateInês Martins0Elena Surra1Márcia Ventura2Nuno Lapa3NOVA University Lisbon, NOVA School of Science and Technology, Department of Chemistry, LAQV-REQUIMTE, 2829-516 Caparica, PortugalInstituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, LAQV-REQUIMTE, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, PortugalNOVA University Lisbon, NOVA School of Science and Technology, Department of Chemistry, LAQV-REQUIMTE, 2829-516 Caparica, PortugalNOVA University Lisbon, NOVA School of Science and Technology, Department of Chemistry, LAQV-REQUIMTE, 2829-516 Caparica, PortugalFood wastes represent one third of all food produced worldwide. It is crucial to both prevent the production of food waste and recover the wasted fraction with the aim to valorizing it. In this context, the conversion of the organic fraction of municipal solid wastes (OFMSW) into bioH<sub>2</sub> by dark fermentation (DF) is an important technology to valorize these wastes into renewable fuel. Nevertheless, the DF of OFMSW needs to be optimized for critical operational parameters. The main purposes of this study were to investigate (i) the effect of HRT during continuous bioH<sub>2</sub> production through DF and (ii) the effect of organic loading rate (OLR) ruled by HRT. In this work, three HRTs (4, 5, and 6 d) were tested in a mesophilic continuous stirred-tank reactor (CSTR). The HRTs of 4, 5, and 6 days, corresponding to OLRs of 23.6, 18.0, and 10.6 g volatile solids (VS)·L<sup>−1</sup>·d<sup>−1</sup>, respectively, showed bioH<sub>2</sub> yields of 8.48, 18.2, and 1.64 L·kg<sup>−1</sup> VS<sub>influent</sub> with an H<sub>2</sub> content of approximately 25, 32, and 5% <i>v</i>/<i>v</i>, respectively. An accumulation of volatile fatty acids (VFAs) was registered with the decrease in HRT, causing a decrease in bioH<sub>2</sub> production. The 5 d HRT was the most favorable condition.https://www.mdpi.com/2076-3417/12/9/4240bioH<sub>2</sub>dark fermentationhydraulic retention timemicrobial consortiumorganic fraction of municipal solid wastesorganic loading rate |
| spellingShingle | Inês Martins Elena Surra Márcia Ventura Nuno Lapa BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate Applied Sciences bioH<sub>2</sub> dark fermentation hydraulic retention time microbial consortium organic fraction of municipal solid wastes organic loading rate |
| title | BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate |
| title_full | BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate |
| title_fullStr | BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate |
| title_full_unstemmed | BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate |
| title_short | BioH<sub>2</sub> from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time and Organic Loading Rate |
| title_sort | bioh sub 2 sub from dark fermentation of ofmsw effect of the hydraulic retention time and organic loading rate |
| topic | bioH<sub>2</sub> dark fermentation hydraulic retention time microbial consortium organic fraction of municipal solid wastes organic loading rate |
| url | https://www.mdpi.com/2076-3417/12/9/4240 |
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