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Tang Z, Chen L, Zhang Y, Xia M, Zhou Z, Wang Q, Taoli H, Zheng T, Meng X. Improved Short-Chain Fatty Acids Production and Protein Degradation During the Anaerobic Fermentation of Waste-Activated Sludge via Alumina Slag-Modified Biochar. Appl Biochem Biotechnol 2024; 196:6115-6133. [PMID: 38183605 DOI: 10.1007/s12010-023-04816-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2023] [Indexed: 01/08/2024]
Abstract
As the by-product in the biological sewage treatment, waste-activated sludge (WAS) always suffers from the difficulty of disposal. Anaerobic fermentation to achieve valuable carbon sources is a feasible way for resource utilization of WAS, whereas the process is always restricted by its biochemical efficiency. Hence, the WAS was used as the feedstock in this study. Alumina slag-modified biochar (Al@BioC) respectively from pine wood (PW) or fresh vinegar residue (FVR) was employed to stimulate the process of short-chain fatty acids (SCFAs) production during the anaerobic treatment of WAS. The results indicate that the addition of Al@BioC could facilitate the distinct increase in SCFAs yield (42.66 g/L) by 14.09% and acetate yield (33.30 g/L) by 18.77%, respectively, when compared with that in regular fermentation without Al@BioC addition. Furthermore, protein degradation was also improved. With the Al@BioCPW added, the maximum concentration of soluble protein reached 867.68 mg/L and was 24.39% higher than the initial level, while the enhancement in the group with Al@BioCFVR and without biochar addition was 12.49% and 7.44%, respectively. According to the results of 16S rDNA sequencing, the relative abundance of acid-producing bacteria (Bacteroidota and Firmicutes) was enriched, enhancing the pathways of protein metabolisms and the ability to resist the harsh environment, respectively. Moreover, Proteiniphilum under Bacteroidota and Fastidiosipila under Firmicutes were the main microorganisms to metabolize protein. The above results might provide a novel material for harvesting the SCFAs production, which is conducive to harmless disposal and carbon resource recovery.
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Affiliation(s)
- Zijian Tang
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China
| | - Lin Chen
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China
| | - Yu Zhang
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Ming Xia
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China
| | - Zhengzhong Zhou
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China
| | - Qian Wang
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China
| | - Huhe Taoli
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Tao Zheng
- CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China
| | - Xiaoshan Meng
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China.
- Changzhou Key Laboratory of Biomass Green, Safe & High Value Utilization Technology, Changzhou University, Changzhou, 213164, China.
- CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China.
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Anaerobic Acidogenic Fermentation of Cellobiose by Immobilized Cells: Prediction of Organic Acids Production by Response Surface Methodology. Processes (Basel) 2021. [DOI: 10.3390/pr9081441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Response surface methodology was used to derive a prediction model for organic acids production by anaerobic acidogenic fermentation of cellobiose, using a mixed culture immobilized on γ-alumina. Three parameters (substrate concentration, temperature, and initial pH) were evaluated. In order to determine the limits of the parameters, preliminary experiments at 37 °C were conducted using substrates of various cellobiose concentrations and pH values. Cellobiose was used as a model sugar for subsequent experiments with lignocellulosic biomass. The culture was well adapted to cellobiose by successive subculturing at 37 °C in synthetic media (with 100:5:1 COD:N:P ratio). The experimental data of successive batch fermentations were fitted into a polynomial model for the total organic acids concentration in order to derive a predictive model that could be utilized as a tool to predict fermentation results when lignocellulosic biomass is used as a substrate. The quadratic effect of temperature was the most significant, followed by the quadratic effect of initial pH and the linear effect of cellobiose concentration. The results corroborated the validity and effectiveness of the model.
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Arras W, Hussain A, Hausler R, Guiot SR. Mesophilic, thermophilic and hyperthermophilic acidogenic fermentation of food waste in batch: Effect of inoculum source. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 87:279-287. [PMID: 31109527 DOI: 10.1016/j.wasman.2019.02.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 12/09/2018] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
Distinctions in hydrolysis and acidogenesis were examined for a series of anaerobic batch reactors inoculated with three different anaerobic mixed cultures (mesophilic, thermophilic and hyperthermophilic anaerobic sludge) and operated at the temperature of inoculum's origin and additionally at 70 °C. Hyperthermophilic temperatures led to increased hydrolysis rates during the start-up stage but a rapid drop in pH limited the overall hydrolysis efficiency, indicating the importance of pH control to sustain the high reaction rates at higher temperatures. No significant difference (P > 0.05) was observed among hydrolysis efficiencies obtained for different reactors which ranged between 27 ± 3% and 40 ± 14%. The highest fermentation yield of 0.44 g COD of fermentation products/g VSS-CODadded was obtained under thermophilic conditions, followed by mesophilic (0.33 g COD ferm. prod./g VSS-CODadded) and hyperthermophilic conditions (0.05-0.08 g COD ferm. prod./g VSS-CODadded). Fermentative performance was better at mesophilic and thermophilic conditions as indicated by improved production of volatile fatty acids (VFA). VFAs accounted for 60-71% of the solubilised matter at thermophilic and mesophilic conditions. Acetic acid formed the primary VFA (70%) at mesophilic temperatures, while butyric acid was the major VFA at thermophilic (60%) conditions. Hyperthermophilic conditions led to increased production of lactic acid, which comprised up to 32% of the solubilised matter. Overall, the results indicate that different operating temperatures may not significantly affect the substrate degradation efficiency but clearly influence the biotransformation pathways.
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Affiliation(s)
- W Arras
- École de technologie supérieure, Département du génie de la construction, 1100, Notre-Dame Ouest, Montréal H3C 1K3, Canada; Anaerobic Bioprocesses Group, Energy, Mining and Environment Research Center, National Research Council Canada, 6100 Royalmount Avenue, Montreal H4P 2R2, Canada
| | - A Hussain
- School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
| | - R Hausler
- École de technologie supérieure, Département du génie de la construction, 1100, Notre-Dame Ouest, Montréal H3C 1K3, Canada
| | - S R Guiot
- Anaerobic Bioprocesses Group, Energy, Mining and Environment Research Center, National Research Council Canada, 6100 Royalmount Avenue, Montreal H4P 2R2, Canada.
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Dima A, Boura K, Bekatorou A, Stergiou PY, Foukis A, Gkini OA, Kandylis P, Pissaridi K, Kanellaki M, Papamichael EM, Koutinas AA. Scale-up for esters production from straw whiskers for biofuel applications. BIORESOURCE TECHNOLOGY 2017; 242:109-112. [PMID: 28433585 DOI: 10.1016/j.biortech.2017.04.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/03/2017] [Accepted: 04/06/2017] [Indexed: 06/07/2023]
Abstract
Delignified wheat straw was fermented by a mixed bacterial anaerobic culture obtained from a UASB reactor to produce organic acids (OAs). Kissiris was used as immobilization carrier in a 2-compartment 82L bioreactor filled with 17L of fermentation broth for the first 7 fermentation batches and up to 40L for the subsequent batches. The amount of straw used was 30g/L and the temperature was set at 37°C for all experiments. The total OAs reached concentrations up to 17.53g/L and the produced ethanol ranged from 0.3 to 1mL/L. The main OAs produced was acetic acid (6-8g/L) and butyric acid (3-8g/L). The OAs were recovered from the fermentation broth by a downstream process using 1-butanol, which was the solvent with the best recovery yields and also served as the esterification alcohol. The enzymatic esterification of OAs resulted to 90% yield.
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Affiliation(s)
- Agapi Dima
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Konstantina Boura
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Argyro Bekatorou
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Panagiota-Yiolanda Stergiou
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Athanasios Foukis
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Olga A Gkini
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Panagiotis Kandylis
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Katerina Pissaridi
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Maria Kanellaki
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Emmanuel M Papamichael
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Athanasios A Koutinas
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece.
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Foukis A, Gkini OA, Stergiou PY, Sakkas VA, Dima A, Boura K, Koutinas A, Papamichael EM. Sustainable production of a new generation biofuel by lipase-catalyzed esterification of fatty acids from liquid industrial waste biomass. BIORESOURCE TECHNOLOGY 2017; 238:122-128. [PMID: 28433899 DOI: 10.1016/j.biortech.2017.04.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/03/2017] [Accepted: 04/06/2017] [Indexed: 06/07/2023]
Abstract
In this work we suggest a methodology comprising the design and use of cost-effective, sustainable, and environmentally friendly process for biofuel production compatible with the market demands. A new generation biofuel is produced using fatty acids, which were generated from acidogenesis of industrial wastes of bioethanol distilleries, and esterified with selected alcohols by immobilized Candida antarctica Lipase-B. Suitable reactors with significant parameters and conditions were studied through experimental design, and novel esterification processes were suggested; among others, the continuous removal of the produced water was provided. Finally, economically sustainable biofuel production was achieved providing high ester yield (<97%) along with augmented concentration (3.35M) in the reaction mixtures at relatively short esterification times, whereas the immobilized lipase maintained over 90% of its initial esterifying ability after reused for ten cycles.
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Affiliation(s)
- Athanasios Foukis
- Enzyme Biotechnology & Genetic Engineering Group, University of Ioannina, Department of Chemistry, Ioannina 45110, Greece
| | - Olga A Gkini
- Enzyme Biotechnology & Genetic Engineering Group, University of Ioannina, Department of Chemistry, Ioannina 45110, Greece
| | - Panagiota-Yiolanda Stergiou
- Enzyme Biotechnology & Genetic Engineering Group, University of Ioannina, Department of Chemistry, Ioannina 45110, Greece
| | - Vasilios A Sakkas
- Enzyme Biotechnology & Genetic Engineering Group, University of Ioannina, Department of Chemistry, Ioannina 45110, Greece
| | - Agapi Dima
- Food Biotechnology Group, University of Patras, Department of Chemistry, Patras 26500, Greece
| | - Konstantina Boura
- Food Biotechnology Group, University of Patras, Department of Chemistry, Patras 26500, Greece
| | - Athanasios Koutinas
- Food Biotechnology Group, University of Patras, Department of Chemistry, Patras 26500, Greece
| | - Emmanuel M Papamichael
- Enzyme Biotechnology & Genetic Engineering Group, University of Ioannina, Department of Chemistry, Ioannina 45110, Greece.
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Bekatorou A, Dima A, Tsafrakidou P, Boura K, Lappa K, Kandylis P, Pissaridi K, Kanellaki M, Koutinas AA. Downstream extraction process development for recovery of organic acids from a fermentation broth. BIORESOURCE TECHNOLOGY 2016; 220:34-37. [PMID: 27560489 DOI: 10.1016/j.biortech.2016.08.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 08/10/2016] [Accepted: 08/11/2016] [Indexed: 06/06/2023]
Abstract
The present study focused on organic acids (OAs) recovery from an acidogenic fermentation broth, which is the main problem regarding the use of OAs for production of ester-based new generation biofuels or other applications. Specifically, 10 solvents were evaluated for OAs recovery from aqueous media and fermentation broths. The effects of pH, solvent/OAs solution ratios and application of successive extractions were studied. The 1:1 solvent/OAs ratio showed the best recovery rates in most cases. Butyric and isobutyric acids showed the highest recovery rates (80-90%), while lactic, succinic, and acetic acids were poorly recovered (up to 45%). The OAs recovery was significantly improved by successive 10-min extractions. Alcohols presented the best extraction performance. The process using repeated extractions with 3-methyl-1-butanol led to the highest OAs recovery. However, 1-butanol can be considered as the most cost-effective option taking into account its price and availability.
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Affiliation(s)
- Argyro Bekatorou
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Agapi Dima
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Panagiotia Tsafrakidou
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Konstantina Boura
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Katerina Lappa
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Panagiotis Kandylis
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Katerina Pissaridi
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Maria Kanellaki
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Athanasios A Koutinas
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece.
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Koutinas A, Kanellaki M, Bekatorou A, Kandylis P, Pissaridi K, Dima A, Boura K, Lappa K, Tsafrakidou P, Stergiou PY, Foukis A, Gkini OA, Papamichael EM. Economic evaluation of technology for a new generation biofuel production using wastes. BIORESOURCE TECHNOLOGY 2016; 200:178-185. [PMID: 26492169 DOI: 10.1016/j.biortech.2015.09.093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 09/20/2015] [Accepted: 09/21/2015] [Indexed: 06/05/2023]
Abstract
An economic evaluation of an integrated technology for industrial scale new generation biofuel production using whey, vinasse, and lignocellulosic biomass as raw materials is reported. Anaerobic packed-bed bioreactors were used for organic acids production using initially synthetic media and then wastes. Butyric, lactic and acetic acid were predominately produced from vinasse, whey, and cellulose, respectively. Mass balance was calculated for a 16,000L daily production capacity. Liquid-liquid extraction was applied for recovery of the organic acids using butanol-1 as an effective extraction solvent which serves also as the alcohol for the subsequent enzyme-catalyzed esterification. The investment needed for the installation of the factory was estimated to about 1.7million€ with depreciation excepted at about 3months. For cellulosics, the installation investment was estimated to be about 7-fold higher with depreciation at about 1.5years. The proposed technology is an alternative trend in biofuel production.
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Affiliation(s)
- Athanasios Koutinas
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece.
| | - Maria Kanellaki
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Argyro Bekatorou
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Panagiotis Kandylis
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Katerina Pissaridi
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Agapi Dima
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Konstantina Boura
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Katerina Lappa
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Panagiota Tsafrakidou
- Food Biotechnology Group, Department of Chemistry, University of Patras, Patras 26500, Greece
| | - Panagiota-Yiolanda Stergiou
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Athanasios Foukis
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Olga A Gkini
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Emmanuel M Papamichael
- Group of Enzyme Biotechnology and Genetic Engineering, Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
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Lappa K, Kandylis P, Bastas N, Klaoudatos S, Athanasopoulos N, Bekatorou A, Kanellaki M, Koutinas AA. New generation biofuel: continuous acidogenesis of sucrose-raffinose mixture simulating vinasse is promoted by γ-alumina pellets. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:74. [PMID: 25991923 PMCID: PMC4436871 DOI: 10.1186/s13068-015-0255-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 04/17/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND This investigation comprises a contribution on the production of a new generation biofuel using the industrial liquid waste of bioethanol distilleries, known as vinasse. This study focuses on the exploitation of vinasse as an acidogenesis substrate for volatile fatty acids and simultaneous ethanol production. These products can be used for ester production, which is the new generation biofuel. Therefore, the aims of the present study are (i) to examine any promotional effect of γ-alumina on acidogenesis of a sucrose-raffinose mixture simulating vinasse, (ii) to study the operational stability of the continuous acidogenesis of sucrose and raffinose and subsequently of vinasse, and (iii) to determine the volatile fatty acid chemical composition and ethanol formation. RESULTS Batch acidogenesis of sucrose and raffinose mixtures showed that γ-alumina promoted fermentation leading to an increase in the volatile fatty acid yield factor from 40% to 95% compared to free cells. The application of the system in continuous mode for more than 3 months showed that the continuous volatile fatty acid productivity obtained was higher than 7 g/L/day. Lactic acid was the predominant acid when sucrose and raffinose were used while butyric acid in the case of vinasse. The highest volatile fatty acid concentration reached was 19 g/L for vinasse. CONCLUSIONS A promoting effect of γ-alumina in acidogenic fermentation of sucrose-raffinose and vinasse is reported. Continuous acidogenesis of sucrose-raffinose mixtures and vinasse using γ-alumina with immobilized cells showed high operational stability (more than 3 months). These findings result in easy scale up of the process that will produce a high annual added value of $11,000,000 in a daily bioethanol production plant of 50,000 L.
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Affiliation(s)
- Katerina Lappa
- />Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patra, Greece
| | - Panagiotis Kandylis
- />Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patra, Greece
| | | | | | | | - Argyro Bekatorou
- />Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patra, Greece
| | - Maria Kanellaki
- />Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patra, Greece
| | - Athanasios A Koutinas
- />Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patra, Greece
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Lappa K, Kandylis P, Bekatorou A, Bastas N, Klaoudatos S, Athanasopoulos N, Kanellaki M, Koutinas AA. Continuous acidogenesis of sucrose, raffinose and vinasse using mineral kissiris as promoter. BIORESOURCE TECHNOLOGY 2015; 188:43-48. [PMID: 25748017 DOI: 10.1016/j.biortech.2015.01.131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Revised: 01/26/2015] [Accepted: 01/29/2015] [Indexed: 06/04/2023]
Abstract
The use of kissiris as promoter (culture immobilization carrier) in anaerobic acidogenesis of sucrose, raffinose and vinasse is reported. Initially, the effect of pH (4-8) and fermentation temperature (18-52 °C) on the accumulation of low molecular weight organic acids (OAs) during sucrose acidogenesis, was evaluated. The promoting effect of kissiris was confirmed compared to free cells, resulting in 80% increased OAs production. The optimum conditions (pH 8; 37 °C) were used during acidogenesis of sucrose/raffinose mixtures. A continuous system was also operated for more than 2 months. When sucrose and sucrose/raffinose mixtures were used, lactic acid type fermentation prevailed, while when vinasse was used, butyric acid type fermentation occurred. Total OAs concentrations were more than 14 g/L and ethanol concentrations were 0.5-1 mL/L. Culture adaptation in vinasse was necessary to avoid poor results. The proposed process is promising for new generation ester-based biofuel production from industrial wastes.
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Affiliation(s)
- Katerina Lappa
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Panagiotis Kandylis
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Argyro Bekatorou
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | | | | | | | - Maria Kanellaki
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece
| | - Athanasios A Koutinas
- Food Biotechnology Group, Department of Chemistry, University of Patras, 26500 Patras, Greece.
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