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Alokika, Anu, Kumar A, Kumar V, Singh B. Cellulosic and hemicellulosic fractions of sugarcane bagasse: Potential, challenges and future perspective. Int J Biol Macromol 2020; 169:564-582. [PMID: 33385447 DOI: 10.1016/j.ijbiomac.2020.12.175] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/29/2020] [Accepted: 12/23/2020] [Indexed: 12/01/2022]
Abstract
Sugarcane bagasse is a rich source of cellulose (32-45%), hemicellulose (20-32%) and lignin (17-32%), 1.0-9.0% ash and some extractives. Huge amount of the generation of sugarcane bagasse has been a great challenge to industries and environment at global level for many years. Though cellulosic and hemicellulosic fractions in bagasse makes it a potential raw substrate for the production of value-added products at large scale, the presence of lignin hampers its saccharification which further leads to low yields of the value-added products. Therefore, an appropriate pretreatment strategy is of utmost importance that effectively solubilizes the lignin that exposes cellulose and hemicellulose for enzymatic action. Pretreatment also reduces the biomass recalcitrance i.e., cellulose crystallinity, structural complexity of cell wall and lignification for its effective utilization in biorefinery. Sugarcane bagasse served as nutrient medium for the cultivation of diverse microorganisms for the production of industrially important metabolites including enzymes, reducing sugars, prebiotic, organic acids and biofuels. Sugarcane bagasse has been utilized in the generation of electricity, syngas and as biosorbant in the bioremediation of heavy metals. Furthermore, the ash generated from bagasse is an excellent source for the synthesis of high strength and light weight bricks and tiles. Present review describes the utility of sugarcane bagasse as sustainable and renewable lignocellulosic substrate for the production of industrially important multifarious value-added products.
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Affiliation(s)
- Alokika
- Laboratory of Bioprocess Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Anu
- Laboratory of Bioprocess Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Anil Kumar
- Department of Botany, Pt. N.R.S. Govt. College, Rohtak 124001, Haryana, India
| | - Vinod Kumar
- Department of Chemistry, Central University of Haryana, Jant-Pali, Mahendergarh 123031, Haryana, India
| | - Bijender Singh
- Laboratory of Bioprocess Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India; Department of Biotechnology, Central University of Haryana, Jant-Pali, Mahendergarh 123031, Haryana, India.
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Xiao Z, Cheng C, Bao T, Liu L, Wang B, Tao W, Pei X, Yang ST, Wang M. Production of butyric acid from acid hydrolysate of corn husk in fermentation by Clostridium tyrobutyricum: kinetics and process economic analysis. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:164. [PMID: 29946355 PMCID: PMC6003175 DOI: 10.1186/s13068-018-1165-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Butyric acid is an important chemical currently produced from petrochemical feedstocks. Its production from renewable, low-cost biomass in fermentation has attracted large attention in recent years. In this study, the feasibility of corn husk, an abundant agricultural residue, for butyric acid production by using Clostridium tyrobutyricum immobilized in a fibrous bed bioreactor (FBB) was evaluated. RESULTS Hydrolysis of corn husk (10% solid loading) with 0.4 M H2SO4 at 110 °C for 6 h resulted in a hydrolysate containing ~ 50 g/L total reducing sugars (glucose:xylose = 1.3:1.0). The hydrolysate was used for butyric acid fermentation by C. tyrobutyricum in a FBB, which gave 42.6 and 53.0% higher butyric acid production from glucose and xylose, respectively, compared to free-cell fermentations. Fermentation with glucose and xylose mixture (1:1) produced 50.37 ± 0.04 g L-1 butyric acid with a yield of 0.38 ± 0.02 g g-1 and productivity of 0.34 ± 0.03 g L-1 h-1. Batch fermentation with corn husk hydrolysate produced 21.80 g L-1 butyric acid with a yield of 0.39 g g-1, comparable to those from glucose. Repeated-batch fermentations consistently produced 20.75 ± 0.65 g L-1 butyric acid with an average yield of 0.39 ± 0.02 g g-1 in three consecutive batches. An extractive fermentation process can be used to produce, separate, and concentrate butyric acid to > 30% (w/v) sodium butyrate at an economically attractive cost for application as an animal feed supplement. CONCLUSION A high concentration of total reducing sugars at ~ 50% (w/w) yield was obtained from corn husk after acid hydrolysis. Stable butyric acid production from corn husk hydrolysate was achieved in repeated-batch fermentation with C. tyrobutyricum immobilized in a FBB, demonstrating that corn husk can be used as an economical substrate for butyric acid production.
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Affiliation(s)
- Zhiping Xiao
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Chu Cheng
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Teng Bao
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, OH 43210 USA
| | - Lujie Liu
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Bin Wang
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Wenjing Tao
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Xun Pei
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
| | - Shang-Tian Yang
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, OH 43210 USA
| | - Minqi Wang
- College of Animal Science, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058 People’s Republic of China
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Terán Hilares R, Ienny JV, Marcelino PF, Ahmed MA, Antunes FAF, da Silva SS, Santos JCD. Ethanol production in a simultaneous saccharification and fermentation process with interconnected reactors employing hydrodynamic cavitation-pretreated sugarcane bagasse as raw material. BIORESOURCE TECHNOLOGY 2017; 243:652-659. [PMID: 28709070 DOI: 10.1016/j.biortech.2017.06.159] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 06/07/2023]
Abstract
In this study, sugarcane bagasse (SCB) pretreated with alkali assisted hydrodynamic cavitation (HC) was investigated for simultaneous saccharification and fermentation (SSF) process for bioethanol production in interconnected column reactors using immobilized Scheffersomyces stipitis NRRL-Y7124. Initially, HC was employed for the evaluation of the reagent used in alkaline pretreatment. Alkalis (NaOH, KOH, Na2CO3, Ca(OH)2) and NaOH recycled black liquor (successive batches) were used and their pretreatment effectiveness was assessed considering the solid composition and its enzymatic digestibility. In SSF process using NaOH-HC pretreatment SCB, 62.33% of total carbohydrate fractions were hydrolyzed and 17.26g/L of ethanol production (0.48g of ethanol/g of glucose and xylose consumed) was achieved. This proposed scheme of HC-assisted NaOH pretreatment together with our interconnected column reactors showed to be an interesting new approach for biorefineries.
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Affiliation(s)
- Ruly Terán Hilares
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil.
| | - João Vitor Ienny
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil
| | - Paulo Franco Marcelino
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil
| | - Muhammad Ajaz Ahmed
- Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Felipe A F Antunes
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil
| | - Silvio Silvério da Silva
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil
| | - Júlio César Dos Santos
- Department of Biotechnology, Engineering School of Lorena, University of São Paulo, CEP 12602-810, Brazil
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Ayeni AO, Omoleye JA, Hymore FK, Pandey RA. EFFECTIVE ALKALINE PEROXIDE OXIDATION PRETREATMENT OF SHEA TREE SAWDUST FOR THE PRODUCTION OF BIOFUELS: KINETICS OF DELIGNIFICATION AND ENZYMATIC CONVERSION TO SUGAR AND SUBSEQUENT PRODUCTION OF ETHANOL BY FERMENTATION USING Saccharomyces cerevisiae. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2016. [DOI: 10.1590/0104-6632.20160331s20140258] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- A. O. Ayeni
- National Environmental Engineering Research Institute, India; Covenant University, Nigeria
| | | | | | - R. A. Pandey
- National Environmental Engineering Research Institute, India
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Grimaldi MP, Marques MP, Laluce C, Cilli EM, Sponchiado SRP. Evaluation of lime and hydrothermal pretreatments for efficient enzymatic hydrolysis of raw sugarcane bagasse. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:205. [PMID: 26633992 PMCID: PMC4667421 DOI: 10.1186/s13068-015-0384-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 11/16/2015] [Indexed: 05/15/2023]
Abstract
BACKGROUND Ethanol production from sugarcane bagasse requires a pretreatment step to disrupt the cellulose-hemicellulose-lignin complex and to increase biomass digestibility, thus allowing the obtaining of high yields of fermentable sugars for the subsequent fermentation. Hydrothermal and lime pretreatments have emerged as effective methods in preparing the lignocellulosic biomass for bioconversion. These pretreatments are advantageous because they can be performed under mild temperature and pressure conditions, resulting in less sugar degradation compared with other pretreatments, and also are cost-effective and environmentally sustainable. In this study, we evaluated the effect of these pretreatments on the efficiency of enzymatic hydrolysis of raw sugarcane bagasse obtained directly from mill without prior screening. In addition, we evaluated the structure and composition modifications of this bagasse after lime and hydrothermal pretreatments. RESULTS The highest cellulose hydrolysis rate (70 % digestion) was obtained for raw sugarcane bagasse pretreated with lime [0.1 g Ca(OH)2/g raw] for 60 min at 120 °C compared with hydrothermally pretreated bagasse (21 % digestion) under the same time and temperature conditions. Chemical composition analyses showed that the lime pretreatment of bagasse promoted high solubilization of lignin (30 %) and hemicellulose (5 %) accompanied by a cellulose accumulation (11 %). Analysis of pretreated bagasse structure revealed that lime pretreatment caused considerable damage to the bagasse fibers, including rupture of the cell wall, exposing the cellulose-rich areas to enzymatic action. CONCLUSION We showed that lime pretreatment is effective in improving enzymatic digestibility of raw sugarcane bagasse, even at low lime loading and over a short pretreatment period. It was also demonstrated that this pretreatment caused alterations in the structure and composition of raw bagasse, which had a pronounced effect on the enzymes accessibility to the substrate, resulting in an increase of cellulose hydrolysis rate. These results indicate that the use of raw sugarcane bagasse (without prior screening) pretreated with lime (cheaper and environmentally friendly reagent) may represent a cost reduction in the cellulosic ethanol production.
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Affiliation(s)
- Maira Prearo Grimaldi
- Department of Biochemistry and Technology Chemistry, Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni 55, Araraquara, SP CEP 14800–060 Brazil
| | - Marina Paganini Marques
- Department of Biochemistry and Technology Chemistry, Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni 55, Araraquara, SP CEP 14800–060 Brazil
| | - Cecília Laluce
- Department of Biochemistry and Technology Chemistry, Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni 55, Araraquara, SP CEP 14800–060 Brazil
| | - Eduardo Maffud Cilli
- Department of Biochemistry and Technology Chemistry, Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni 55, Araraquara, SP CEP 14800–060 Brazil
| | - Sandra Regina Pombeiro Sponchiado
- Department of Biochemistry and Technology Chemistry, Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni 55, Araraquara, SP CEP 14800–060 Brazil
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Menezes EGT, do Carmo JR, Alves JGLF, Menezes AGT, Guimarães IC, Queiroz F, Pimenta CJ. Optimization of alkaline pretreatment of coffee pulp for production of bioethanol. Biotechnol Prog 2014; 30:451-62. [DOI: 10.1002/btpr.1856] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 10/15/2013] [Indexed: 11/11/2022]
Affiliation(s)
| | - Juliana R. do Carmo
- Dept. of Food Science; Federal University of Lavras; Lavras Minas Gerais Brazil
| | | | - Aline G. T. Menezes
- Dept. of Food Science; Federal University of Lavras; Lavras Minas Gerais Brazil
| | | | - Fabiana Queiroz
- Dept. of Food Science; Federal University of Lavras; Lavras Minas Gerais Brazil
| | - Carlos J. Pimenta
- Dept. of Food Science; Federal University of Lavras; Lavras Minas Gerais Brazil
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Lopes MR, de Souza CJA, Rodrigues MQRB, Costa DA, dos Santos AF, de Oliveira LL, Ramos HJO, Guimarães VM, Silveira WB, Passos FML, Fietto LG. Production and Characterization of β-Glucanase Secreted by the Yeast Kluyveromyces marxianus. Appl Biochem Biotechnol 2014; 172:2412-24. [DOI: 10.1007/s12010-013-0683-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 12/15/2013] [Indexed: 01/17/2023]
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Enhancement of the Enzymatic Digestibility and Ethanol Production from Sugarcane Bagasse by Moderate Temperature-Dilute Ammonia Treatment. Appl Biochem Biotechnol 2013; 171:1108-1117. [DOI: 10.1007/s12010-013-0327-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 06/10/2013] [Indexed: 10/26/2022]
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Yu Q, Zhuang X, Lv S, He M, Zhang Y, Yuan Z, Qi W, Wang Q, Wang W, Tan X. Liquid hot water pretreatment of sugarcane bagasse and its comparison with chemical pretreatment methods for the sugar recovery and structural changes. BIORESOURCE TECHNOLOGY 2013; 129:592-8. [PMID: 23306094 DOI: 10.1016/j.biortech.2012.11.099] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 11/21/2012] [Accepted: 11/22/2012] [Indexed: 05/23/2023]
Abstract
Liquid hot water (LHW), dilute hydrochloric acid (HCl) and dilute sodium hydroxide (NaOH) were applied to sugarcane bagasse (SB). Application of the same analytical methods and material balance approaches facilitated meaningful comparisons of glucose and xylose yields from combined pretreatment and enzymatic hydrolysis. All pretreatments enhanced sugar recovery from pretreatment and subsequent enzymatic hydrolysis substantially compared to untreated sugarcane bagasse. Adding Tween80 in the enzymatic hydrolysis process increased the conversion level of glucan/xylan by 0.3-fold, especially for the low pH pretreatment where more lignin was left in the solids. The total sugar recovery from sugarcane bagasse with the coupled operations of pretreatment and 72 h enzymatic digestion reached 71.6% for LHW process, 76.6% for HCl pretreatment and 77.3% for NaOH pretreatment. Different structural changes at the plant tissue, cellular, and cell wall levels might be responsible for the different enzymatic digestibility. Furthermore, a combined LHW and aqueous ammonia pretreatment was proposed to reduce energy input and enhance the sugar recovery.
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Affiliation(s)
- Qiang Yu
- Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
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Wei D, Liu X, Yang ST. Butyric acid production from sugarcane bagasse hydrolysate by Clostridium tyrobutyricum immobilized in a fibrous-bed bioreactor. BIORESOURCE TECHNOLOGY 2013; 129:553-560. [PMID: 23270719 DOI: 10.1016/j.biortech.2012.11.065] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 11/10/2012] [Accepted: 11/16/2012] [Indexed: 06/01/2023]
Abstract
A fermentation process using Clostridium tyrobutyricum immobilized in a fibrous-bed bioreactor (FBB) was developed for butyric acid production from sugarcane bagasse (SCB) hydrolysate. SCB was first treated with dilute acid and then hydrolyzed with cellulases. The hydrolysate containing glucose and xylose was used as carbon source for the fermentation without detoxification. The bacterium was able to grow at a specific growth rate of ∼0.06 h(-1) in media containing 15-20% (w/v) SCB in serum bottles. In batch cultures in the FBB, both glucose and xylose in the SCB hydrolysate were simultaneously converted to butyrate with a high yield (0.45-0.54 g/gsugar) and productivity (0.48-0.60 g/Lh). A final butyrate concentration of 20.9 g/L was obtained in a fed-batch culture, with an overall productivity of 0.51 g/Lh and butyrate yield of 0.48 g/g sugar consumed. This work demonstrated the feasibility of using SCB as a low-cost feedstock to produce butyric acid.
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Affiliation(s)
- Dong Wei
- State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, PR China; William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 West 19th Avenue, Columbus, OH 43210, USA.
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Lime Pretreatment and Fermentation of Enzymatically Hydrolyzed Sugarcane Bagasse. Appl Biochem Biotechnol 2013; 169:1696-712. [DOI: 10.1007/s12010-013-0097-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Accepted: 01/09/2013] [Indexed: 10/27/2022]
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12
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Two-Stage Acidic–Alkaline Hydrothermal Pretreatment of Lignocellulose for the High Recovery of Cellulose and Hemicellulose Sugars. Appl Biochem Biotechnol 2013; 169:1069-87. [DOI: 10.1007/s12010-012-0038-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Accepted: 12/17/2012] [Indexed: 10/27/2022]
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Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations. INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING 2013. [DOI: 10.1155/2013/719607] [Citation(s) in RCA: 198] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Pretreatment of lignocellulose has received considerable research globally due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. Some of the most promising pretreatment methods require the application of chemicals such as acids, alkali, salts, oxidants, and solvents. Thus, advances in research have enabled the development and integration of chemical-based pretreatment into proprietary ethanol production technologies in several pilot and demonstration plants globally, with potential to scale-up to commercial levels. This paper reviews known and emerging chemical pretreatment methods, highlighting recent findings and process innovations developed to offset inherent challenges via a range of interventions, notably, the combination of chemical pretreatment with other methods to improve carbohydrate preservation, reduce formation of degradation products, achieve high sugar yields at mild reaction conditions, reduce solvent loads and enzyme dose, reduce waste generation, and improve recovery of biomass components in pure forms. The use of chemicals such as ionic liquids, NMMO, and sulphite are promising once challenges in solvent recovery are overcome. For developing countries, alkali-based methods are relatively easy to deploy in decentralized, low-tech systems owing to advantages such as the requirement of simple reactors and the ease of operation.
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Yu Z, Jameel H, Chang HM, Park S. The effect of delignification of forest biomass on enzymatic hydrolysis. BIORESOURCE TECHNOLOGY 2011; 102:9083-9. [PMID: 21802941 DOI: 10.1016/j.biortech.2011.07.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 06/28/2011] [Accepted: 07/05/2011] [Indexed: 05/13/2023]
Abstract
The effect of delignification methods on enzymatic hydrolysis of forest biomass was investigated using softwood and hardwood that were pretreated at an alkaline condition followed by sodium chlorite or ozone delignification. Both delignifications improved enzymatic hydrolysis especially for softwood, while pretreatment alone was found effective for hardwood. High enzymatic conversion was achieved by sodium chlorite delignification when the lignin content was reduced to 15%, which is corresponding to 0.30-0.35 g/g accessible pore volume, and further delignification showed a marginal effect. Sample crystallinity index increased with lignin removal, but it did not show a correlation with the overall carbohydrate conversion of enzymatic hydrolysis.
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Affiliation(s)
- Zhiying Yu
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695-8005, USA
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Rabelo SC, Carrere H, Maciel Filho R, Costa AC. Production of bioethanol, methane and heat from sugarcane bagasse in a biorefinery concept. BIORESOURCE TECHNOLOGY 2011; 102:7887-95. [PMID: 21689929 DOI: 10.1016/j.biortech.2011.05.081] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 05/26/2011] [Accepted: 05/30/2011] [Indexed: 05/05/2023]
Abstract
The potential of biogas production from the residues of second generation bioethanol production was investigated taking into consideration two types of pretreatment: lime or alkaline hydrogen peroxide. Bagasse was pretreated, enzymatically hydrolyzed and the wastes from pretreatment and hydrolysis were used to produce biogas. Results have shown that if pretreatment is carried out at a bagasse concentration of 4% DM, the highest global methane production is obtained with the peroxide pretreatment: 72.1 Lmethane/kgbagasse. The recovery of lignin from the peroxide pretreatment liquor was also the highest, 112.7 ± 0.01 g/kg of bagasse. Evaluation of four different biofuel production scenarios has shown that 63-65% of the energy that would be produced by bagasse incineration can be recovered by combining ethanol production with the combustion of lignin and hydrolysis residues, along with the anaerobic digestion of pretreatment liquors, while only 32-33% of the energy is recovered by bioethanol production alone.
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Affiliation(s)
- S C Rabelo
- Faculdade de Engenharia Química, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6066, 13083-970 Campinas, São Paulo, Brazil.
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