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Pandey AK, Negi S. Enhanced ethanol production using hydrophobic resin detoxified Pine forest litter hydrolysate and integrated fermentation process development supplementing molasses. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-30185-5. [PMID: 37801246 DOI: 10.1007/s11356-023-30185-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 09/26/2023] [Indexed: 10/07/2023]
Abstract
Globally escalating ethanol demand necessitates the use of hybrid technologies integrating first- and second-generation biofuel feedstocks for achieving the futuristic targets of gasoline replacement with bioethanol. In present study, an optimized two-step sequential pre-treatment (first dilute alkali, then dilute acid) of Pine forest litter (PFL) was developed. Furthermore, the saccharification of pre-treated PFL was optimized through Response Surface Methodology using Box-Behnken Design, wherein 0.558 g/g of reducing sugar was released under the optimized conditions (12.5% w/v of biomass loading, 10 FPU/g of PFL enzyme loading, 0.15% v/v Tween-80 and 48 h incubation time). Moreover, during hydrolysate fermentation using Saccharomyces cerevisiae NCIM 3288 strain, 22.51 ± 1.02 g/L ethanol was produced. Remarkably, hydrophobic resin (XAD-4) treatment of PFL hydrolysate, significantly removed inhibitors (Furfural, 5-hydroxymethylfurfural and phenolics) and increased ethanol production to 27.38 ± 1.18 g/L. Furthermore, during fermentation of molasses supplemented PFL hydrolysate (total initial sugar: 100 ± 3.27 g/L), a maximum of 46.02 ± 2.08 g/L ethanol was produced with 0.482 g/g yield and 1.92 g/l/h productivity. These findings indicated that the integration of molasses to lignocellulosic hydrolysate, would be a promising hybrid technology for industrial ethanol production within existing bio-refinery infrastructure.
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Affiliation(s)
- Ajay Kumar Pandey
- Department of Life Sciences and Biotechnology, Chhatrapati Shahu Ji Maharaj University, Kanpur, Kanpur, 208024, Uttar Pradesh, India.
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, Uttar Pradesh, India.
| | - Sangeeta Negi
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, Uttar Pradesh, India
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do Nascimento BF, de Araujo CMB, do Nascimento AC, da Silva FLH, de Melo DJN, Jaguaribe EF, Lima Cavalcanti JVF, da Motta Sobrinho MA. Detoxification of sisal bagasse hydrolysate using activated carbon produced from the gasification of açaí waste. JOURNAL OF HAZARDOUS MATERIALS 2021; 409:124494. [PMID: 33309384 DOI: 10.1016/j.jhazmat.2020.124494] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/23/2020] [Accepted: 11/03/2020] [Indexed: 06/12/2023]
Abstract
Due to its recalcitrance and difficult disruption, biomass requires severe treatment conditions to produce bioproducts. These processes also generate substances that inhibit microbial metabolism, resulting in low conversion of sugars into bioproducts. To minimize this, in this work the sisal bagasse acid hydrolysate was detoxified using the activated carbon obtained from residues of the gasification of açaí endocarp. The adsorbent properties were analyzed, and the effects of experimental parameters related to furfural adsorption were evaluated. Then, the validation of the adsorption experiments was carried out in acid hydrolyzed liquor from sisal bagasse, the fermentation tests being performed with Saccharomyces cerevisiae. Overall, the furfural adsorption in the activated carbon was fast since most of the furfural was removed in the first minutes of the experiment. The Sips isotherm fit the experimental data best, with maximum adsorption capacity of 48.02 mg.g-1. Kinetic data fitted LDF, QDF and FD models, and diffusivity parameters were obtained. After detoxification, the activated carbon from açaí waste removed 52% of furfural, 100% of HMF and 40.4% of acetic acid with moderate loss of sugars (17%). The results confirmed that the adsorbent is effective and promising for removing furfural and other fermentation inhibitors.
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Affiliation(s)
- Bruna Figueiredo do Nascimento
- Chemical Engineering Department, Universidade Federal de Pe rnambuco (UFPE), Rua Prof. Arthur de Sá, s/n, Cidade Universitária, 50740-521 Recife, PE, Brazil.
| | - Caroline Maria Bezerra de Araujo
- Chemical Engineering Department, Universidade Federal de Pe rnambuco (UFPE), Rua Prof. Arthur de Sá, s/n, Cidade Universitária, 50740-521 Recife, PE, Brazil; Chemical Engineering Department, Faculty of Engineering of the University of Porto (FEUP - UPorto), R. Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
| | - Alisson Castro do Nascimento
- Chemical Engineering Department, Universidade Federal de Pe rnambuco (UFPE), Rua Prof. Arthur de Sá, s/n, Cidade Universitária, 50740-521 Recife, PE, Brazil
| | - Flávio Luiz Honorato da Silva
- Food Engineering Department, Universidade Federal da Paraíba (UFPB), Campos Universitário 1, W/N, 58051-900 João Pessoa, PB, Brazil
| | - Débora Jamila Nóbrega de Melo
- Chemical Engineering Department, Universidade Federal da Paraíba (UFPB), Campos Universitário 1, W/N, 58051-900 João Pessoa, PB, Brazil
| | - Emerson Freitas Jaguaribe
- Mechanical Engineering Department, Universidade Federal da Paraíba (UFPB), Campos Universitário 1, W/N, 58051-900 João Pessoa, PB, Brazil
| | | | - Mauricio Alves da Motta Sobrinho
- Chemical Engineering Department, Universidade Federal de Pe rnambuco (UFPE), Rua Prof. Arthur de Sá, s/n, Cidade Universitária, 50740-521 Recife, PE, Brazil
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