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Mohammadi M, Alian M, Dale B, Ubanwa B, Balan V. Multifaced application of AFEX-pretreated biomass in producing second-generation biofuels, ruminant animal feed, and value-added bioproducts. Biotechnol Adv 2024; 72:108341. [PMID: 38499256 DOI: 10.1016/j.biotechadv.2024.108341] [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] [Received: 02/04/2024] [Revised: 03/06/2024] [Accepted: 03/15/2024] [Indexed: 03/20/2024]
Abstract
Lignocellulosic biomass holds a crucial position in the prospective bio-based economy, serving as a sustainable and renewable source for a variety of bio-based products. These products play a vital role in displacing fossil fuels and contributing to environmental well-being. However, the inherent recalcitrance of biomass poses a significant obstacle to the efficient access of sugar polymers. Consequently, the bioconversion of lignocellulosic biomass into fermentable sugars remains a prominent challenge in biorefinery processes to produce biofuels and biochemicals. In addressing these challenges, extensive efforts have been dedicated to mitigating biomass recalcitrance through diverse pretreatment methods. One noteworthy process is Ammonia Fiber Expansion (AFEX) pretreatment, characterized by its dry-to-dry nature and minimal water usage. The volatile ammonia, acting as a catalyst in the process, is recyclable. AFEX contributes to cleaning biomass ester linkages and facilitating the opening of cell wall structures, enhancing enzyme accessibility and leading to a fivefold increase in sugar conversion compared to untreated biomass. Over the last decade, AFEX has demonstrated substantial success in augmenting the efficiency of biomass conversion processes. This success has unlocked the potential for sustainable and economically viable biorefineries. This paper offers a comprehensive review of studies focusing on the utilization of AFEX-pretreated biomass in the production of second-generation biofuels, ruminant feed, and additional value-added bioproducts like enzymes, lipids, proteins, and mushrooms. It delves into the details of the AFEX pretreatment process at both laboratory and pilot scales, elucidates the mechanism of action, and underscores the role of AFEX in the biorefinery for developing biofuels and bioproducts, and nutritious ruminant animal feed production. While highlighting the strides made, the paper also addresses current challenges in the commercialization of AFEX pretreatment within biorefineries. Furthermore, it outlines critical considerations that must be addressed to overcome these challenges, ensuring the continued progress and widespread adoption of AFEX in advancing sustainable and economically viable bio-based industries.
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Affiliation(s)
- Maedeh Mohammadi
- Department of Engineering Technology, Cullen College of Engineering, University of Houston, Sugarland, TX 77479, USA
| | - Mahsa Alian
- Department of Engineering Technology, Cullen College of Engineering, University of Houston, Sugarland, TX 77479, USA
| | - Bruce Dale
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
| | - Bryan Ubanwa
- Department of Engineering Technology, Cullen College of Engineering, University of Houston, Sugarland, TX 77479, USA
| | - Venkatesh Balan
- Department of Engineering Technology, Cullen College of Engineering, University of Houston, Sugarland, TX 77479, USA.
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2
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Lech M, Labus K. The methods of brewers’ spent grain treatment towards the recovery of valuable ingredients contained therein and comprehensive management of its residues. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.05.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Lu J, Cheng M, Zhao C, Shao Q, Hassan M. Combined oxidization and liquid ammonia pretreatment of bamboo of various ages and species for maximizing fermentable sugar release. BIORESOURCE TECHNOLOGY 2022; 343:126085. [PMID: 34610426 DOI: 10.1016/j.biortech.2021.126085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 09/30/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
To determine the potential for improving biomass enzymolysis, a combined oxidization and liquid ammonia pretreatment (OD-LAT) was employed for bamboo. The effects of oxidant, bamboo ages, and species on the pretreatment effectiveness and subsequent enzymolysis were studied. Under the optimal OD-LAT pretreatment and enzymolysis of the B-NA bamboo Neosinocalamus affinis, the glucan and xylan conversion reached 83.85% and 78.66%, respectively, and approximately 59.7-68.5 g of fermentable sugars can be produced per 100 g of dry bamboo, which was an approximately 5-8 fold increase compared with untreated sample. The H2O2 loading of 1.0 was the optimal oxidant dosage for the OD-LAT process. The OD-LAT pretreatment was only suitable for bamboo under three-year-old, and it significantly improved the enzymolysis of B-NA and B-BM, while it was limited to B-DO and B-PP. The pretreatment effects of bamboo were not only related to composition but also to the bamboo age, species, macro-structures and micro-structures.
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Affiliation(s)
- Jiajun Lu
- College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, People's Republic of China; Institute of Carbon Neutrality, Zhejiang A&F University, Hangzhou, Zhejiang 311300, People's Republic of China
| | - Mingyang Cheng
- College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, People's Republic of China; National Engineering Research Center for Wood-based Resource Utilization, Hangzhou, Zhejiang 311300, People's Republic of China
| | - Chao Zhao
- College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, People's Republic of China.
| | - Qianjun Shao
- Faculty of Mechanical Engineering & Mechanics, Ningbo University of Technology, Ningbo, Zhejiang 315211, People's Republic of China
| | - Muhammad Hassan
- US-Pakistan Centre for Advanced Studies in Energy, National University of Science and Technology, Islamabad 44000, Pakistan
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Wang L, Cao Z, Zou J, Liu Z, Li Y, Wang Z. Urea-pretreated corn stover: Physicochemical characteristics, delignification kinetics, and methane production. BIORESOURCE TECHNOLOGY 2020; 306:123097. [PMID: 32192958 DOI: 10.1016/j.biortech.2020.123097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 02/23/2020] [Accepted: 02/28/2020] [Indexed: 06/10/2023]
Abstract
Solids loading is a key factor in aqueous or gaseous ammonia production from urea. Methane production from urea-pretreated corn stover, as well as the physicochemical characteristics and delignification kinetics of the corn stover, were investigated with four solids loading values (10%-70%) and five ratios of urea to corn stover (1:100-7:10) at 35 °C for 6 weeks. A 1:20 ratio of urea to corn stover was optimal for achieving high lignin removal with ≤50% solids loading, and 7:10 was optimal with 70% solids loading. Under the two optimal conditions, 85.56% and 82.35% of cellulose and 85.76% and 85.49% of hemicellulose were retained. The maximum lignin removal rates of 69.67% and 68.27% and methane production of 294.70 and 292.56 L/kg volatile solids (VS) were achieved, respectively. The delignification kinetics of the urea-pretreated corn stover conformed to three first-order reactions. Most of the lignin was degraded within the first 3 weeks.
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Affiliation(s)
- Lili Wang
- College of Engineering, Northeast Agricultural University, Harbin 150030, China
| | - Zhen Cao
- College of Engineering, Northeast Agricultural University, Harbin 150030, China
| | - Jianyang Zou
- College of Engineering, Northeast Agricultural University, Harbin 150030, China
| | - Zhuo Liu
- College of Engineering, Northeast Agricultural University, Harbin 150030, China
| | - Yibo Li
- College of Engineering, Northeast Agricultural University, Harbin 150030, China
| | - Zhongjiang Wang
- College of Engineering, Northeast Agricultural University, Harbin 150030, China.
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5
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Joshi SM, Gogate PR. Intensification of dilute acid hydrolysis of spent tea powder using ultrasound for enhanced production of reducing sugars. ULTRASONICS SONOCHEMISTRY 2020; 61:104843. [PMID: 31683236 DOI: 10.1016/j.ultsonch.2019.104843] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/30/2019] [Accepted: 10/24/2019] [Indexed: 06/10/2023]
Abstract
Spent tea (ST) powder is one of the potential sustainable sources available abundantly and can be utilized to produce reducing sugars required for production of platform chemicals. The current study aims at intensifying the reducing sugars production based on ultrasound assisted dilute acid hydrolysis (UADAH). The effects of reaction time, solid liquid ratio, acid concentration and temperature on the yield of reducing sugars were investigated initially for UADAH process based on ultrasonic (US) horn. The highest yield of 24.75 g/L for the reducing sugars was obtained at solid liquid ratio of 1:8, acid concentration of 1% w/v and temperature of 60 °C within 120 min. Use of oxidants like hydrogen peroxide (H2O2) and Fenton's reagent to further intensify the production has also been studied. Use of H2O2 at optimum loading of 0.75 g/L resulted in reducing sugars yield of 26.2 g/L within 75 min while using same H2O2 loading with FeSO4 at loading of 0.75 g/L along with UADAH reduced the reaction time to 60 min for almost similar yield. Large scale studies performed using US flow cell revealed that yield of reducing sugars as 22.4 g/L is obtained in 120 min in the case of only UADAH, while in the case of UADAH along with H2O2 and Fenton's reagent, similar yield of reducing sugars was obtained in only 90 and 60 min respectively. UADAH in combination with oxidants has been demonstrated as an effective and intensified approach to produce reducing sugars from spent tea powder available as sustainable source.
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Affiliation(s)
- Saurabh M Joshi
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 400019, India
| | - Parag R Gogate
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
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6
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Zhao C, Shao Q, Chundawat SPS. Recent advances on ammonia-based pretreatments of lignocellulosic biomass. BIORESOURCE TECHNOLOGY 2020; 298:122446. [PMID: 31791921 DOI: 10.1016/j.biortech.2019.122446] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 11/15/2019] [Accepted: 11/16/2019] [Indexed: 05/06/2023]
Abstract
Ammonia-based pretreatments have been extensively studied in the last decade as one of the leading pretreatment technologies for lignocellulose biorefining. Here, we discuss the key features and compare performances of several leading ammonia-based pretreatments (e.g., soaking in aqueous ammonia or SAA, ammonia recycled percolation or ARP, ammonia fiber expansion or AFEX, and extractive ammonia or EA). We provide detailed insight into the distinct physicochemical mechanisms employed during ammonia-based pretreatments and its impact on downstream bioprocesses (e.g., enzymatic saccharification); such as modification of cellulose crystallinity, lignin/hemicellulose structure, and other ultrastructural changes such as cell wall porosity. Lastly, a brief overview of process technoeconomics and environmental impacts are discussed, along with recommendations for future areas of research on ammonia-based pretreatments.
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Affiliation(s)
- Chao Zhao
- National Engineering Research Center for Wood-based Resource Utilization, School of Engineering, Zhejiang A&F University, Linan, Zhejiang 311300, People's Republic of China
| | - Qianjun Shao
- Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo, Zhejiang 315211, People's Republic of China
| | - Shishir P S Chundawat
- Department of Chemical & Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
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Zhang W, Wang JJ, Gao Y, Zhang LL. Bacterial cellulose synthesized with apple pomace enhanced by ionic liquid pretreatment. Prep Biochem Biotechnol 2019; 50:330-340. [DOI: 10.1080/10826068.2019.1692222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Wen Zhang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi’an, China
| | - Jian-Jun Wang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi’an, China
| | - Yuan Gao
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi’an, China
| | - Le-Le Zhang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi’an, China
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8
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9
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Ravindran R, Jaiswal S, Abu-Ghannam N, Jaiswal AK. A comparative analysis of pretreatment strategies on the properties and hydrolysis of brewers' spent grain. BIORESOURCE TECHNOLOGY 2018; 248:272-279. [PMID: 28648256 DOI: 10.1016/j.biortech.2017.06.039] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 06/06/2017] [Accepted: 06/07/2017] [Indexed: 05/25/2023]
Abstract
In this study, brewer's spent grain (BSG) was subjected to a range pretreatments to study the effect on reducing sugar yield. Glucose and xylose were found to be the predominant sugars in BSG. Brewers spent grain was high in cellulose (19.21g/100g of BSG) and lignin content (30.84g/100g of BSG). Microwave assisted alkali (MAA) pretreatment was found to be the most effective pretreatment for BSG, where the pretreatment was conducted at 400W for 60s. A maximum reducing yield was observed with high biomass loading (1g/10ml), cellulase (158.76μl/10ml), hemicellulase (153.3μl/10ml), pH (5.4) and an incubation time (120h). Upon enzymatic hydrolysis, MAA pretreated BSG yielded 228.25mg of reducing sugar/g of BSG which was 2.86-fold higher compared to native BSG (79.67mg/g of BSG); simultaneously BSG was de-lignified significantly. The changes in functional groups, crystallinity and thermal behaviour was studies by means of FTIR, XRD and DSC, respectively.
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Affiliation(s)
- Rajeev Ravindran
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland
| | - Swarna Jaiswal
- Centre for Research in Engineering and Surface Technology, FOCAS Institute, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland
| | - Nissreen Abu-Ghannam
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland
| | - Amit K Jaiswal
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland.
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10
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Ravindran R, Jaiswal S, Abu-Ghannam N, Jaiswal AK. Two-step sequential pretreatment for the enhanced enzymatic hydrolysis of coffee spent waste. BIORESOURCE TECHNOLOGY 2017; 239:276-284. [PMID: 28531852 DOI: 10.1016/j.biortech.2017.05.049] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 05/08/2017] [Accepted: 05/09/2017] [Indexed: 05/24/2023]
Abstract
In the present study, eight different pretreatments of varying nature (physical, chemical and physico-chemical) followed by a sequential, combinatorial pretreatment strategy was applied to spent coffee waste to attain maximum sugar yield. Pretreated samples were analysed for total reducing sugar, individual sugars and generation of inhibitory compounds such as furfural and hydroxymethyl furfural (HMF) which can hinder microbial growth and enzyme activity. Native spent coffee waste was high in hemicellulose content. Galactose was found to be the predominant sugar in spent coffee waste. Results showed that sequential pretreatment yielded 350.12mg of reducing sugar/g of substrate, which was 1.7-fold higher than in native spent coffee waste (203.4mg/g of substrate). Furthermore, extensive delignification was achieved using sequential pretreatment strategy. XRD, FTIR, and DSC profiles of the pretreated substrates were studied to analyse the various changes incurred in sequentially pretreated spent coffee waste as opposed to native spent coffee waste.
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Affiliation(s)
- Rajeev Ravindran
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland
| | - Swarna Jaiswal
- Centre for Research in Engineering and Surface Technology, FOCAS Institute, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland
| | - Nissreen Abu-Ghannam
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland
| | - Amit K Jaiswal
- School of Food Science and Environmental Health, College of Sciences and Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland.
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11
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12
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Díaz AB, Blandino A, Belleli C, Caro I. An Effective Process for Pretreating Rice Husk To Enhance Enzyme Hydrolysis. Ind Eng Chem Res 2014. [DOI: 10.1021/ie501354r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ana Belén Díaz
- Department of Chemical Engineering
and Food Technology, Faculty of Sciences, International Agri-Food
Campus of Excellence (CeiA3), University of Cádiz, Polígono
Rı́o San Pedro s/n, Puerto Real 11510, Spain
| | - Ana Blandino
- Department of Chemical Engineering
and Food Technology, Faculty of Sciences, International Agri-Food
Campus of Excellence (CeiA3), University of Cádiz, Polígono
Rı́o San Pedro s/n, Puerto Real 11510, Spain
| | - Csaba Belleli
- Department of Chemical Engineering
and Food Technology, Faculty of Sciences, International Agri-Food
Campus of Excellence (CeiA3), University of Cádiz, Polígono
Rı́o San Pedro s/n, Puerto Real 11510, Spain
| | - Ildefonso Caro
- Department of Chemical Engineering
and Food Technology, Faculty of Sciences, International Agri-Food
Campus of Excellence (CeiA3), University of Cádiz, Polígono
Rı́o San Pedro s/n, Puerto Real 11510, Spain
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13
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Bamboo: a new source of carbohydrate for biorefinery. Carbohydr Polym 2014; 111:645-54. [PMID: 25037399 DOI: 10.1016/j.carbpol.2014.05.025] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 04/08/2014] [Accepted: 05/03/2014] [Indexed: 01/08/2023]
Abstract
Bamboo is perennial woody grass, which distributed widely in the world and belonged to the Gramineae family and Bambuseae subfamily. It may be consider as a candidate lignocellulosic substrate for bio-ethanol production for its environmental benefits and higher annual biomass yield. The conversion of bamboo into bio-ethanol, bio-methane, natural food, flavonoids, and functional xylo-oligosaccharides production were reviewed in this paper. Future prospects for research include pretreatment, enzymatic hydrolysis and fermentation will also be performed to improve the whole process of ethanol production more economical. And revealing the molecular regulation mechanism of the fast growth of bamboo will provide chance for improving bamboo or other energy plants biomass yield through genetic engineering.
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Xiao X, Bian J, Li MF, Xu H, Xiao B, Sun RC. Enhanced enzymatic hydrolysis of bamboo (Dendrocalamus giganteus Munro) culm by hydrothermal pretreatment. BIORESOURCE TECHNOLOGY 2014; 159:41-7. [PMID: 24637337 DOI: 10.1016/j.biortech.2014.02.096] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Revised: 02/19/2014] [Accepted: 02/21/2014] [Indexed: 05/11/2023]
Abstract
Bamboo was non-isothermally pretreated with hot water at 140-200°C for different times (10-120 min). The effects of pretreatment conditions on the degradation of carbohydrates, cellulose crystallinity, partial removal/relocation of lignin, morphologic change of the feedstock, and glucose yield during the enzymatic hydrolysis were investigated. The effective removal of amorphous cellulose and hemicelluloses led to the increase of crystalline index of the residues. In comparison with the raw material, the surface of the pretreated samples was irregular and numerous lignin droplets appeared on the cellulose bundle surface under the intense pretreatment conditions. The glucose conversion increased with the raise of pretreatment temperature and the prolongation of time, and the maximum conversion of 75.7% was achieved for the sample pretreated at 200°C for 120 min, whereas the untreated sample was only 15.7%. The result illustrated that hydrothermal pretreatment affected the composition of bamboo, and remarkably enhanced the enzymatic hydrolysis efficiency.
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Affiliation(s)
- Xiao Xiao
- Northwest A&F University, Yangling 712100, China; Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Jing Bian
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Ming-Fei Li
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Hui Xu
- Northwest A&F University, Yangling 712100, China
| | - Bin Xiao
- Northwest A&F University, Yangling 712100, China.
| | - Run-Cang Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
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15
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He Y, Zhang J, Bao J. Dry dilute acid pretreatment by co-currently feeding of corn stover feedstock and dilute acid solution without impregnation. BIORESOURCE TECHNOLOGY 2014; 158:360-4. [PMID: 24630497 DOI: 10.1016/j.biortech.2014.02.074] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 02/19/2014] [Indexed: 05/27/2023]
Abstract
Impregnation of lignocellulose materials with dilute acid solution is a routine operation in conventional dilute acid pretreatment. The dry dilute acid pretreatment (DDAP) at high solids content up to 70% is naturally considered to require longer impregnation time. In this study, a co-currently feeding operation of corn stover and dilute sulfuric acid solution without any impregnation was tested for DDAP. The DDAP pretreated corn stover without impregnation is found to be essentially no difference in pretreatment efficiency compared to those with impregnation in the helically agitated reactor. The yield from cellulose to ethanol in SSF again shows no obvious difference between the DDAP pretreated corn stover with and without impregnation. This study suggests that impregnation in DDAP was not necessary under the helical agitation mixing. The results provided a useful way of cost reduction and process simplification in pretreatment.
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Affiliation(s)
- Yanqing He
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jian Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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16
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Zhao C, Ding W, Chen F, Cheng C, Shao Q. Effects of compositional changes of AFEX-treated and H-AFEX-treated corn stover on enzymatic digestibility. BIORESOURCE TECHNOLOGY 2014; 155:34-40. [PMID: 24412921 DOI: 10.1016/j.biortech.2013.12.091] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 12/18/2013] [Accepted: 12/21/2013] [Indexed: 06/03/2023]
Abstract
Corn stover is one of the main agricultural residues being considered as a cellulosic ethanol feedstock. This work evaluated the effectiveness of AFEX™(1) pretreatment for converting corn stover to fermentable sugars, both with and without pre-soaking in hydrogen peroxide. The compositional changes and enzymatic digestibility of AFEX-treated and H-AFEX-treated biomass were investigated. Results showed that most of the polysaccharides remained intact following each of these two methods. Compared with AFEX pretreatment, the H-AFEX process enhanced delignification and enzymatic hydrolysis yields of both glucose and xylose. The maximum glucan and xylan digestibility of H-AFEX process were 87.78% and 90.64%, respectively, and were obtained using 0.7 (w/w) water loading, 1.0 (w/w) ammonia loading, 0.5 (w/w) 30wt.% hydrogen peroxide loading, and 130°C for 10min. The results of the present work show that H-AFEX is a feasible pretreatment to improve the enzymatic saccharification of corn stover for bioethanol production.
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Affiliation(s)
- Chao Zhao
- College of Engineering, Nanjing Agricultural University, Nanjing, Jiangsu 210031, China; National Engineering Research Center for Wood-based Resource Utilization, School of Engineering, Zhejiang A&F University, Linan, Zhejiang 311300, China
| | - Weimin Ding
- College of Engineering, Nanjing Agricultural University, Nanjing, Jiangsu 210031, China.
| | - Feng Chen
- National Engineering Research Center for Wood-based Resource Utilization, School of Engineering, Zhejiang A&F University, Linan, Zhejiang 311300, China
| | - Cheng Cheng
- National Engineering Research Center for Wood-based Resource Utilization, School of Engineering, Zhejiang A&F University, Linan, Zhejiang 311300, China
| | - Qianjun Shao
- National Engineering Research Center for Wood-based Resource Utilization, School of Engineering, Zhejiang A&F University, Linan, Zhejiang 311300, China.
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