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Bouchareb EM, Derbal K, Bedri R, Menas S, Bouchareb R, Dizge N. Enhanced fermentative hydrogen production from potato waste by enzymatic pretreatment. Environ Technol 2024; 45:1801-1809. [PMID: 36449015 DOI: 10.1080/09593330.2022.2154171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
Biological pretreatment and enzymatic hydrolysis have a potential role in the economic production of sugars and fuels from starch biomass. In this study, the Inoculum/Substrate (I/S) ratio effect and enzymatic pretreatments of potato peels for biohydrogen production in batch reactors were investigated. Two enzymes, α-Amylase and Cellulase, were tested separately and coexistent. Results showed that enzymatic hydrolysis using α-Amylase in mesophilic conditions enhanced carbohydrate concentration from 24.10 g/L to 53.47 g/L, whereas, the use of Cellulase and equi-volumetric mixture of both tested enzymes resulted in 47.16 and 48.16 g/L, respectively. The maximum biohydrogen cumulative production of 263 mL (equivalent to 430.37 mL H2/gVSadded) was obtained using the optimum I/S ratio of 1/6 gVS/gVS at pH 5.5 and incubation temperature of 55°C after 20 days of dark fermentation of potato waste without enzymatic treatment. Under the same operating conditions of the I/S ratio, pH, temperature and the best enzymatic treatment (3 h of substrate enzymatic hydrolysis by α-Amylase), the maximum yield of biohydrogen was 1088 mL (1780.39 mL H2/gVSadded). The enzymatic hydrolysis method adopted in this study can make overall biohydrogen production an effective process. The modified Gompertz model was found to be an adequate fit for biohydrogen production.
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Affiliation(s)
- Esma Mahfouf Bouchareb
- Department of Environmental Engineering, Process Engineering Faculty, Saleh Boubnider University, Constantine, Algeria
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar Constantine, Constantine, Algeria
| | - Kerroum Derbal
- Department of Process Engineering, National High School of Polytechnic, Constantine, Algeria
| | - Rayane Bedri
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar Constantine, Constantine, Algeria
| | - Souha Menas
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar Constantine, Constantine, Algeria
| | - Raouf Bouchareb
- Department of Environmental Engineering, Process Engineering Faculty, Saleh Boubnider University, Constantine, Algeria
| | - Nadir Dizge
- Department of Environmental Engineering, Mersin University, Mersin, Turkey
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2
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Lian T, Zhang W, Cao Q, Yin F, Wang S, Zhou T, Wei X, Zhang F, Zhang Z, Dong H. Enzyme enhanced lactic acid fermentation of swine manure and apple waste: Insights from organic matter transformation and functional bacteria. J Environ Manage 2024; 356:120573. [PMID: 38479289 DOI: 10.1016/j.jenvman.2024.120573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 04/07/2024]
Abstract
Anaerobic co-fermentation is a favorable way to convert agricultural waste, such as swine manure (SM) and apple waste (AW), into lactic acid (LA) through microbial action. However, the limited hydrolysis of organic matter remains a main challenge in the anaerobic co-fermentation process. Therefore, this work aims to deeply understand the impact of cellulase (C) and protease (P) ratios on LA production during the anaerobic co-fermentation of SM with AW. Results showed that the combined use of cellulase and protease significantly improved the hydrolysis during the enzymatic pretreatment, thus enhancing the LA production in anaerobic acidification. The highest LA reached 41.02 ± 2.09 g/L within 12 days at the ratio of C/P = 1:3, which was approximately 1.26-fold of that in the control. After a C/P = 1:3 pretreatment, a significant SCOD release of 45.34 ± 2.87 g/L was achieved, which was 1.13 times the amount in the control. Moreover, improved LA production was also attributed to the release of large amounts of soluble carbohydrates and proteins with enzymatic pretreated SM and AW. The bacterial community analysis revealed that the hydrolytic bacteria Romboutsia and Clostridium_sensu_stricto_1 were enriched after enzyme pretreatment, and Lactobacillus was the dominant bacteria for LA production. This study provides an eco-friendly technology to enhance hydrolysis by enzymatic pretreatment and improve LA production during anaerobic fermentation.
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Affiliation(s)
- Tianjing Lian
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wanqin Zhang
- China Huadian Engineering Co. Ltd., Beijing 100160, China
| | - Qitao Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Fubin Yin
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Shunli Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Tanlong Zhou
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiaoman Wei
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Fangyu Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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3
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Zhuang M, Li G, Wang X, Ke S, Wang A, Zhou Z. Structural property of extractable proteins and polysaccharides in wheat bran following a dual- enzymatic pretreatment and corresponding functionality. Int J Biol Macromol 2024; 255:128100. [PMID: 37981285 DOI: 10.1016/j.ijbiomac.2023.128100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 10/02/2023] [Accepted: 11/13/2023] [Indexed: 11/21/2023]
Abstract
The current study applied dual-enzymatic treatment via alcalase and Bacillus velezensis hydrolase for enhancing extraction of proteins and polysaccharides from wheat bran and modifying their corresponding structure. Results indicated the aqueous extract by enzymatic pretreatment (referred as EHWB) had an increased content of soluble substance, in which 18.5 % increased for carbohydrates and 11.4 % increased for proteins in the extract compared to the aqueous extract without enzymes (labeled as AEWB). Furthermore, compositions with lower molecular weight of 130 kDa and < 21.1 kDa for polysaccharides and proteins, respectively, were found in EHWB. Interestingly, EHWB had a twice higher radicals scavenging than that of AEWB, and digestive property indicated EHWB had a greater peptides production although glucose release was lower in gastric phase. Importantly, this is the first study to reveal that gut microbiota fermentation of EHWB resulted in faster generation of short-chain fatty acids at initial fermentation stage (6 h), followed a higher generation of butyrate at final fermentation stage (24 h). This fermentation property might be associated with its presence of lower molecular weight substrates and even the changes in the molecular structure induced by the enzymes. This study highlights a novel approach for developing a value-added product from wheat bran.
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Affiliation(s)
- Min Zhuang
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Gaoheng Li
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Xuanyu Wang
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Sheng Ke
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Anqi Wang
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Zhongkai Zhou
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory for Processing and Quality Safety Control of Characteristic Agricultural Products, The Ministry of Agriculture and Rural Affairs, Shihezi University, Shihezi 832003, China; Gulbali Institute-Agriculture Water Environment, Charles Sturt University, Wagga Wagga, NSW 2678, Australia.
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4
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Mazega A, Signori-Iamin G, Aguado RJ, Tarrés Q, Ramos LP, Delgado-Aguilar M. Enzymatic pretreatment for cellulose nanofiber production: Understanding morphological changes and predicting reducing sugar concentration. Int J Biol Macromol 2023; 253:127054. [PMID: 37769759 DOI: 10.1016/j.ijbiomac.2023.127054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/31/2023] [Accepted: 09/15/2023] [Indexed: 10/02/2023]
Abstract
Enzymatic pretreatment plays a crucial role in producing cellulose nanofibers (CNFs) before fibrillation. While previous studies have explored how treatment severity affects CNF characteristics, there remains a lack of suitable parameters to monitor real-time enzymatic processes and fully comprehend the link between enzymatic action, fibrillation, and CNF properties. This study focuses on evaluating the impact of enzyme charge (using a monocomponent endoglucanase) and treatment time on cellulose fiber morphology and reducing sugar generation. For the first time, a random forest (RF) model is developed to predict reducing sugar concentration based on easily measurable process conditions (e.g., stirrer power consumption) and fiber/suspension characteristics like fines content and apparent viscosity. Polarized light optical microscopy was found to be a suitable technique to evaluate the morphological changes that fibers experience during enzymatic pretreatment. The research also revealed that endoglucanases initially induce surface fibrillation, releasing fine fibers into the suspension, followed by fiber swelling and shortening. Furthermore, the effect of enzymatic pretreatment on resulting CNF characteristics was studied at two fibrillation intensities, indicating that a high enzyme charge and short treatment times (e.g., 90 min) are sufficient to produce CNFs with a nanofibrillation yield of 19-23 % and a cationic demand ranging from 220 to 275 μeq/g. This work introduces a well-modeled enzymatic pretreatment process, unlocking its potential and reducing uncertainties for future upscaling endeavors.
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Affiliation(s)
- André Mazega
- LEPAMAP-PRODIS Research Group, University of Girona, C/Maria Aurèlia Capmany, 61, 17003 Girona, Spain
| | - Giovana Signori-Iamin
- Graduate Program in Chemical Engineering, Federal University of Paraná, Curitiba, PR, Brazil
| | - Roberto J Aguado
- LEPAMAP-PRODIS Research Group, University of Girona, C/Maria Aurèlia Capmany, 61, 17003 Girona, Spain
| | - Quim Tarrés
- LEPAMAP-PRODIS Research Group, University of Girona, C/Maria Aurèlia Capmany, 61, 17003 Girona, Spain
| | - Luiz P Ramos
- Graduate Program in Chemical Engineering, Federal University of Paraná, Curitiba, PR, Brazil
| | - Marc Delgado-Aguilar
- LEPAMAP-PRODIS Research Group, University of Girona, C/Maria Aurèlia Capmany, 61, 17003 Girona, Spain.
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Cao L, Xue D, Liu X, Wang C, Fang D, Zhang J, Gong C. Ferulic acid production from wheat bran by integration of enzymatic pretreatment and a cold-adapted carboxylesterase catalysis. Bioresour Technol 2023; 385:129435. [PMID: 37399964 DOI: 10.1016/j.biortech.2023.129435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/27/2023] [Accepted: 06/29/2023] [Indexed: 07/05/2023]
Abstract
High-value chemical production from natural lignocellulose transformation is a reliable waste utilization approach. A gene encoding cold-adapted carboxylesterase in Arthrobacter soli Em07 was identified. The gene was cloned and expressed in Escherichia coli to obtain a carboxylesterase enzyme with a molecular weight of 37.2 KDa. The activity of the enzyme was determined using α-naphthyl acetate as substrate. Results showed that the optimum enzyme activity of carboxylesterase was at 10 °C and pH 7.0. It was also found that the enzyme could degrade 20 mg enzymatic pretreated de-starched wheat bran (DSWB) to produce 235.8 μg of ferulic acid under the same conditions, which was 5.6 times more than the control. Compared to the chemical strategy, enzymatic pretreatment is advantageous because it is environmentally friendly, and the by-products can be easily treated. Therefore, this strategy provides an effective method for high-value utilization of biomass waste in agriculture and industry.
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Affiliation(s)
- Liping Cao
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China
| | - Dongsheng Xue
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China
| | - Xiaoji Liu
- CECEP (Feixi) WTE CO., LTD. Hefei 230001, PR China
| | - Chongju Wang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China
| | - Donglai Fang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China
| | - Jiaqi Zhang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China
| | - Chunjie Gong
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, PR China.
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Bouchareb EM, Derbal K, Bedri R, Slimani K, Menas S, Lazreg H, Maaref F, Ouabdelkader S, Saheb A, Bouaita R, Bouchareb R, Dizge N. Improving Biohydrogen Production by Dark Fermentation of Milk Processing Wastewater by Physicochemical and Enzymatic Pretreatments. Appl Biochem Biotechnol 2023:10.1007/s12010-023-04619-2. [PMID: 37682509 DOI: 10.1007/s12010-023-04619-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2023] [Indexed: 09/09/2023]
Abstract
Biohydrogen is considered an alternative energy reserve. Dark fermentation is one of the important green hydrogen production techniques that utilizes organic waste as raw material. It is a promising bioconversion, easy, not expensive, and cost-effective process. Milk processing wastewater (MPWW) is an organic effluent generated in large volumes on a daily basis and disposed directly into the environment. In this research, the study of biochemical hydrogen potential (BHP) test of MPWW was evaluated and used as substrate (S). A waste sludge was used as an inoculum (I) and source of bacteria. Both substrate and inoculum were analyzed and the study was based mainly on the ratio of volatile solids (VS) of inoculum and substrate subsequently, which was noted as I/S. Different substrate pretreatments were performed: ultrasonic, thermal, chemical, and enzymatic hydrolysis. The I/S ratio impact was investigated and evaluated the hydrogen production improvement. Modified Gompertz and modified Logistic kinetic models were employed for the kinetic modeling of cumulative hydrogen production values. Results show that I/S ratio of 1/4 gVS/gVS resulted from the best hydrogen production of 59.96 mL during 30 days of MPWW fermentation without pretreatment. It was also shown that all the adopted pretreatments enhanced hydrogen production, whereas ultrasonic pretreatment for 5 min increased the production by only 14.84%. Heat pretreatment was more efficient, where the hydrogen production increased from 60 to 162 mL (170% of improvement) using heat shock at 90 °C for 30 min. The impact of chemical pretreatment was different from a reagent to another. Pretreatment using calcium hydroxide resulted in the biggest hydrogen production of 165.3 mL (175.5%) compared to the other chemical pretreatments. However, the best hydrogen production was given by the biological pretreatment using enzymatic hydrolysis (Lactase) resulting in 254 mL of hydrogen production, which is equivalent to 323.62% of production improvement. Modified Gompertz and Logistic kinetic models fitted well with experimental data. Thus, the enzymatic hydrolysis of MPWW proved to be a promising technique for biohydrogen production enhancement.
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Affiliation(s)
- Esma Mahfouf Bouchareb
- Department of Environmental Engineering, Process Engineering Faculty, Saleh Boubnider University, 25000, Constantine, Algeria
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
- Laboratory of Process Engineering for Sustainable Development and Health Products (LGPDDPS), National Polytechnic School of Constantine, 25000, Constantine, Algeria
| | - Kerroum Derbal
- Laboratory of Process Engineering for Sustainable Development and Health Products (LGPDDPS), National Polytechnic School of Constantine, 25000, Constantine, Algeria
- Department of Process Engineering, National High School of Polytechnic, Malek Bennabi, Constantine 3, Algeria
| | - Rayane Bedri
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Khaled Slimani
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Souha Menas
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Halima Lazreg
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Feriel Maaref
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Samir Ouabdelkader
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Aya Saheb
- Department of Engineering, National High School of Biotechnology, Toufik Khaznadar, Constantine 3, Algeria
| | - Rokaya Bouaita
- Department of Process Engineering, National High School of Polytechnic, Malek Bennabi, Constantine 3, Algeria
| | - Raouf Bouchareb
- Department of Environmental Engineering, Process Engineering Faculty, Saleh Boubnider University, 25000, Constantine, Algeria
- Laboratory of Process Engineering for Sustainable Development and Health Products (LGPDDPS), National Polytechnic School of Constantine, 25000, Constantine, Algeria
| | - Nadir Dizge
- Department of Environmental Engineering, Mersin University, 33343, Mersin, Turkey.
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Berto GL, Mattos BD, Velasco J, Zhao B, Segato F, Rojas OJ, Arantes V. Endoglucanase effects on energy consumption in mechanical fibrillation of cellulose fibers into nanocelluloses. Int J Biol Macromol 2023:125002. [PMID: 37217053 DOI: 10.1016/j.ijbiomac.2023.125002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/16/2023] [Accepted: 05/19/2023] [Indexed: 05/24/2023]
Abstract
Enzymatic processing is seen as a promising means of moving toward environment-friendly industrial processes such as the use of endoglucanase (EG) enzyme in the production of nanocellulose. However, the properties that make EG pretreatment effective in the isolation of fibrillated cellulose remain a subject of debate. To address this issue, we considered EGs from four glycosyl hydrolase (GH) families (5, 6, 7 and 12) and investigated the roles of the tri-dimensional structures and catalytic features depending on the presence of a carbohydrate binding module (CBM). By using eucalyptus Kraft wood fibers, we produced cellulose nanofibrils (CNF) using mild enzymatic pretreatment followed by disc ultra-refining. Compared with the control (in the absence of pretreatment), the GH5 and GH12 enzymes (CBM free) reduced the fibrillation energy by approximately 15 %. The most efficient energy reduction, 25 and 32 %, was achieved with GH5 and GH6 linked to CBM, respectively. They improved the rheological properties of the CNF suspensions (noting that neither of these EGs released soluble products). Interestingly, while the hydrolytic activity was significant (released soluble products), GH7-CBM did not lead to a reduction in fibrillation energy. Hence, the large molecular weight and wide cleft of GH7-CBM led to soluble sugar release but contributed little to fibrillation. Our findings suggest that the improved fibrillation observed upon EG pretreatment is not a consequence of hydrolytic activity or release of products but mostly related to efficient adsorption on the substrate and modification of the surface viscoelastic (amorphogenesis).
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Affiliation(s)
- Gabriela L Berto
- Department of Biotechnology, Lorena School of Engineering, University of São Paulo, Lorena, SP 12602-810, Brazil; Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland.
| | - Bruno D Mattos
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland
| | - Josman Velasco
- Department of Biotechnology, Lorena School of Engineering, University of São Paulo, Lorena, SP 12602-810, Brazil
| | - Bin Zhao
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland
| | - Fernando Segato
- Department of Biotechnology, Lorena School of Engineering, University of São Paulo, Lorena, SP 12602-810, Brazil
| | - Orlando J Rojas
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland; Bioproducts Institute, Department of Chemical and Biological Engineering, Department of Chemistry and Department of Wood Science, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada
| | - Valdeir Arantes
- Department of Biotechnology, Lorena School of Engineering, University of São Paulo, Lorena, SP 12602-810, Brazil.
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Zou X, He J, Pang H, Zhang P, Pan X, Zhong Y, Duan S, Cui X, Xin X, Zhang J. Investigating the synergic role of asynchronous dosed protease and lysozyme for facilitating excess sludge solubilization and acidogenic fermentation. Sci Total Environ 2023; 885:163759. [PMID: 37146803 DOI: 10.1016/j.scitotenv.2023.163759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/20/2023] [Accepted: 04/23/2023] [Indexed: 05/07/2023]
Abstract
Improving the anaerobic fermentation (AF) efficiency of excess sludge (ES) is essential for attaining biosolid minimization, stabilization, resource recovery, and carbon-emission reduction. Along these lines, here, the synergistic mechanism of protease and lysozyme for enhancing hydrolysis and AF efficiency with better recovery of volatile fatty acids (VFAs) was thoroughly investigated. Single lysozyme was capable of reducing the zeta potential and fractal dimension when dosed into the ES-AF system, which was beneficial for increasing the contact probability between proteases and extracellular proteins. Moreover, the weight-averaged molecular weight of the loosely-bound extracellular polymeric substance (LB-EPS) reduced from 1867 to 1490 in the protease-AF group, which facilitated the penetration of EPS by the lysozyme. The soluble DNA and extracellular DNA (eDNA) of the enzyme cocktail pretreated group increased by 23.24 % and 77.09 %, and the cell viability decreased after 6-hour hydrolysis, demonstrating a better hydrolysis efficiency. Remarkably, the asynchronous dosed enzyme cocktail pretreatment was proven a better strategy to enhance both the solubilization and hydrolysis processes since the synergistic effect of these two enzymes can exclude the mutual interference. As a result, the VFAs were increased by 1.26 times higher than the blank group. The underlying mechanism of an environmental-friendly and effective strategy was examined to promote ES hydrolysis and acidogenic fermentation, which was beneficial for the recovery of VFAs and carbon-emission reduction.
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Affiliation(s)
- Xiang Zou
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China.
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, PR China.
| | - Heliang Pang
- Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Pengfei Zhang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China
| | - Xinlei Pan
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China
| | - Yijie Zhong
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China
| | - Shengye Duan
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China
| | - Xinxin Cui
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, PR China
| | - Xiaodong Xin
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, PR China
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Shi Q, Abdel-Hamid AM, Sun Z, Cheng Y, Tu T, Cann I, Yao B, Zhu W. Carbohydrate-binding modules facilitate the enzymatic hydrolysis of lignocellulosic biomass: Releasing reducing sugars and dissociative lignin available for producing biofuels and chemicals. Biotechnol Adv 2023; 65:108126. [PMID: 36921877 DOI: 10.1016/j.biotechadv.2023.108126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/05/2023] [Accepted: 03/08/2023] [Indexed: 03/16/2023]
Abstract
The microbial decomposition and utilization of lignocellulosic biomass present in the plant tissues are driven by a series of carbohydrate active enzymes (CAZymes) acting in concert. As the non-catalytic domains widely found in the modular CAZymes, carbohydrate-binding modules (CBMs) are intimately associated with catalytic domains (CDs) that effect the diverse hydrolytic reactions. The CBMs function as auxiliary components for the recognition, adhesion, and depolymerization of the complex substrate mediated by the associated CDs. Therefore, CBMs are deemed as significant biotools available for enzyme engineering, especially to facilitate the enzymatic hydrolysis of dense and insoluble plant tissues to acquire more fermentable sugars. This review aims at presenting the taxonomies and biological properties of the CBMs currently curated in the CAZy database. The molecular mechanisms that CBMs use in assisting the enzymatic hydrolysis of plant polysaccharides and the regulatory factors of CBM-substrate interactions are outlined in detail. In addition, guidelines for the rational designs of CBM-fused CAZymes are proposed. Furthermore, the potential to harness CBMs for industrial applications, especially in enzymatic pretreatment of the recalcitrant lignocellulose, is evaluated. It is envisaged that the ideas outlined herein will aid in the engineering and production of novel CBM-fused enzymes to facilitate efficient degradation of lignocellulosic biomass to easily fermentable sugars for production of value-added products, including biofuels.
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Affiliation(s)
- Qicheng Shi
- Laboratory of Gastrointestinal Microbiology, National Center for International Research on Animal Gut Nutrition, Nanjing Agricultural University, Nanjing 210095, China
| | - Ahmed M Abdel-Hamid
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, IL 61801, USA
| | - Zhanying Sun
- Laboratory of Gastrointestinal Microbiology, National Center for International Research on Animal Gut Nutrition, Nanjing Agricultural University, Nanjing 210095, China
| | - Yanfen Cheng
- Laboratory of Gastrointestinal Microbiology, National Center for International Research on Animal Gut Nutrition, Nanjing Agricultural University, Nanjing 210095, China.
| | - Tao Tu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
| | - Isaac Cann
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, IL 61801, USA; Department of Animal Science, University of Illinois at Urbana-Champaign, IL 61801, USA; Department of Microbiology, University of Illinois at Urbana-Champaign, IL 61801, USA; Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, IL 61801, USA; Center for East Asian and Pacific Studies, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Bin Yao
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Weiyun Zhu
- Laboratory of Gastrointestinal Microbiology, National Center for International Research on Animal Gut Nutrition, Nanjing Agricultural University, Nanjing 210095, China
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10
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Hashemi S, Solli L, Aasen R, Lamb JJ, Horn SJ, Lien KM. Stimulating biogas production from steam-exploded birch wood using Fenton reaction and fungal pretreatment. Bioresour Technol 2022; 366:128190. [PMID: 36326549 DOI: 10.1016/j.biortech.2022.128190] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Delignification of steam-exploded birch wood (SEBW) was stimulated using a pretreatment method including Fenton reaction (FR) and fungi. SEBW was employed as a substrate to optimize the Fe(III) and Fe(II) dosage in FR. Maximum iron-binding to SEBW was obtained at pH 3.5. FR pretreatment increased biological methane yields from 257 mL/g vS in control to 383 and 352 mL/ g vS in samples with 0.5 mM Fe(II) and 1.0 mM Fe(III), respectively. Further enzymatic pretreatment using a commercial cellulase cocktail clearly improved methane production rate but only increased the final methane yields by 2-9 %. Finally, pretreatments with the fungi Pleurotus ostreatus (PO) and Lentinula edodes (LE), alone or in combination with FR, were carried out. SEBW pretreated with only LE and samples pretreated with PO and1 mM Fe(III) + H2O2 increased the methane production yield to 420 and 419 mL/g vS respectively. These pretreatments delignified SEBW up to 25 %.
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Affiliation(s)
- Seyedbehnam Hashemi
- Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes vei 1B, 7034 Trondheim, Norway.
| | - Linn Solli
- NIBIO, Norwegian Institute of Bioeconomy Research, Frederik A. Dahls vei 20, 1432 Ås, Norway
| | - Roald Aasen
- NIBIO, Norwegian Institute of Bioeconomy Research, Frederik A. Dahls vei 20, 1432 Ås, Norway
| | - Jacob J Lamb
- Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes vei 1B, 7034 Trondheim, Norway
| | - Svein Jarle Horn
- NIBIO, Norwegian Institute of Bioeconomy Research, Frederik A. Dahls vei 20, 1432 Ås, Norway; Faculty of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| | - Kristian M Lien
- Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes vei 1B, 7034 Trondheim, Norway
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11
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Wu L, Wei W, Liu X, Wang D, Ni BJ. Potentiality of recovering bioresource from food waste through multi-stage Co-digestion with enzymatic pretreatment. J Environ Manage 2022; 319:115777. [PMID: 35982572 DOI: 10.1016/j.jenvman.2022.115777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 07/15/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Food waste (FW) is not only a major social, nutritional and environmental issue, but also an underutilized resource with significant energy, which has not been fully explored currently. Considering co-digestion can adjust carbon to nitrogen ratio (C/N) of the feedstock and improve the synergetic interactions among microorganisms, anaerobic co-digestion (AnCoD) is then becoming an emerging approach to achieve higher energy recovery from FW while ensuring the stability of the system. To obtain higher economic gain from such biodegradable wastes, increasing attention has been paid on optimizing the system configuration or applying enzymatic hydrolysis before digesting FW. A better understanding on the potentiality of correlating enzymatic pretreatment and AnCoD operated in various system configuration would enhance the bioresource recovery from FW and increase revenue through treating this organic waste. Specifically, the biobased chemicals outputs from FW-related co-digestion system with different configuration were firstly compared in this review. A deep discussion concerning the challenges for achieving bioresources recovery from FW co-digestion systems with enzymatic pretreatment was then given. Recommendations for future studies regarding FW co-digestion were then proposed at last.
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Affiliation(s)
- Lan Wu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Wei Wei
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Xuran Liu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Dongbo Wang
- Key Laboratory of Environmental Biology and Pollution Control, College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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12
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Zhang M, Zhang D, Wei Y, Zhou B, Yan C, Wang D, Liang J, Zhou L. Fungal mash enzymatic pretreatment combined with pH adjusting approach facilitates volatile fatty acids yield via a short-term anaerobic fermentation of food waste. Waste Manag 2022; 151:1-9. [PMID: 35914374 DOI: 10.1016/j.wasman.2022.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 06/17/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
As an alternative for commercial enzyme, crude enzyme of fungal mash could promote food waste (FW) hydrolysis, but its specific effects coupled pH adjusting on the production of volatile fatty acids (VFAs) remains unknown. The crude enzyme produced from an Aspergillus awamori, named complex-amylase (CA), was added to short-term anaerobic system of FW fermentation. Results showed that adding CA significantly improved the solubility and degradability of biodegradable and non-biodegradable organics in FW, where the SCOD concentration with adding CA increased by 116.9% relative to the control but a marginal enhancement on VFAs yield. In contrast, adding CA combined with adjusting pH 8 markedly increased the VFAs production to 32.0 g COD/L, almost 10 times as much as the control. Besides, pH adjusting altered the metabolic pathway from lactate-type to butyrate-type. Adding CA coupled pH adjusting significant increase the component of butyrate compared with pH adjusting alone. Moreover, microbial community analysis indicated that adding CA reinforced proportion of the butyrate-producing bacteria (e.g., Dialister) under basic conditions, thus enhancing the butyrate metabolic pathways. This study demonstrated that fungal mash pretreatment coupled pH conditioning could be an economical way to enhance VFAs yield for FW valorization during anaerobic fermentation.
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Affiliation(s)
- Mingjiang Zhang
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Dejin Zhang
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yidan Wei
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Bo Zhou
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Cheng Yan
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Dianzhan Wang
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianru Liang
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Lixiang Zhou
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Naning 210095, China.
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13
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Zou X, He J, Zhang P, Pan X, Zhong Y, Zhang J, Wu X, Li B, Tang X, Xiao X, Pang H. Insights into carbon recovery from excess sludge through enzyme-catalyzing hydrolysis strategy: Environmental benefits and carbon-emission reduction. Bioresour Technol 2022; 351:127006. [PMID: 35304256 DOI: 10.1016/j.biortech.2022.127006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
This study introduced the excellent improvement of enzyme cocktail (lysozyme and protease) on hydrolysis efficiency and the role of reducing carbon emission as an alternative carbon source. The best dosing method after optimization was to add four parts of lysozyme at 0 h and one part of protease at 1 h. The extracellular proteins and polysaccharides increased by 118% and 64% respectively under the optimal dosing mode. Enzyme cocktails reduced more organic matters and extended the distribution of sludge particles in the small particle size part. The enzymatic-treated sludge could reduce 21.09 kg CO2/t VSS if utilized to replace methanol for denitrification carbon source. Enzyme cocktails did better in enhancing both solubilization and hydrolysis than single enzymes under the optimal method. This study will provide a more integrated and comprehensive system for enzymatic pretreatment and new insight into the enzymatic pretreatment enhancing hydrolysis and reducing carbon emission.
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Affiliation(s)
- Xiang Zou
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China.
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, People's Republic of China
| | - Pengfei Zhang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Xinlei Pan
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Yijie Zhong
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Jie Zhang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Xuewei Wu
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Biqing Li
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Xia Tang
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Xiannian Xiao
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Heliang Pang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China; Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, People's Republic of China
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14
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Dionizio BS, Rabelo CABS, de Jesus HCR, Varesche MBA, de Souza DHF. The Deconstruction of the Lignocellulolytic Structure of Sugarcane Bagasse by Laccases Improves the Production of H 2 and Organic Acids. Appl Biochem Biotechnol 2022; 194:3145-3166. [PMID: 35349085 DOI: 10.1007/s12010-022-03905-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 03/14/2022] [Indexed: 01/31/2023]
Abstract
The production of biofuels using sugarcane bagasse (SCB) as substrate can be considered an environmentally friendly approach, due to the possibility of combining energy production with the reuse of agroindustrial wastes. This study was undertaken to explore the applicability of a new extract with the enzymes (Lacmix) isolated from Chaetomium cupreum for SCB pretreatment. Lacmix was more active at pH of 2.2 to 4 and 50 to 60 °C. Further, the individual and mutual effects of SCB concentration (6.6 to 23.4 g L- 1), enzyme concentration (0.066 to 0.234 U L- 1), and incubation time of the SCB with Lacmix (19 to 221 min) on SCB pretreatment were evaluated using a response surface methodology and central composite design. The optimized conditions were 23.4 g L- 1 SCB, 0.234 U mL- 1 laccases, and 2.44 h resulting in 547 ± 108 mg L- 1 of total sugars. This value agrees with the predicted value (455 ± 41 mg L- 1) by the statistical model. Through the SCB pretreated with Lacmix fermentation, 96.1% more H2 and 22.5% more organic acids were observed compared to SCB without pretreatment. Therefore, laccases improve delignification, maximizing biomass fermentation for biofuel production.
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Affiliation(s)
- Bruna Soares Dionizio
- Chemistry Department, Federal University of São Carlos, Rod Washington Luis s/n, Km 235, 13565-905, São Carlos, SP, Brazil
| | - Camila Abreu B Silva Rabelo
- Laboratory of Biological Processes, Department of Hydraulics and Sanitation, Engineering School of São Carlos, University of São Paulo (EESC - USP) Campus II, 13563-120, São Carlos, SP, Brazil
| | - Hugo César Ramos de Jesus
- Chemistry Department, Federal University of São Carlos, Rod Washington Luis s/n, Km 235, 13565-905, São Carlos, SP, Brazil.,Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada
| | - Maria Bernadete Amâncio Varesche
- Laboratory of Biological Processes, Department of Hydraulics and Sanitation, Engineering School of São Carlos, University of São Paulo (EESC - USP) Campus II, 13563-120, São Carlos, SP, Brazil
| | - Dulce Helena Ferreira de Souza
- Chemistry Department, Federal University of São Carlos, Rod Washington Luis s/n, Km 235, 13565-905, São Carlos, SP, Brazil.
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15
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Sanchez-Salvador JL, Campano C, Balea A, Tarrés Q, Delgado-Aguilar M, Mutjé P, Blanco A, Negro C. Critical comparison of the properties of cellulose nanofibers produced from softwood and hardwood through enzymatic, chemical and mechanical processes. Int J Biol Macromol 2022; 205:220-230. [PMID: 35182566 DOI: 10.1016/j.ijbiomac.2022.02.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/01/2022] [Accepted: 02/13/2022] [Indexed: 12/20/2022]
Abstract
Current knowledge on the properties of different types of cellulose nanofibers (CNFs) is fragmented. Properties variation is very extensive, depending on raw materials, effectiveness of the treatments to extract the cellulose fraction from the lignocellulosic biomass, pretreatments to facilitate cellulose fibrillation and final mechanical process to separate the microfibrils. Literature offers multiple parameters to characterize the CNFs prepared by different routes. However, there is a lack of an extensive guide to compare the CNFs. In this study, we perform a critical comparison of rheological, compositional, and morphological features of CNFs, produced from the most representative types of woody plants, hardwood and softwood, using different types and intensities of pretreatments, including enzymatic, chemical and mechanical ones, and varying the severity of mechanical treatment focusing on the relationship between macroscopic and microscopic parameters. This structured information will be exceedingly useful to select the most appropriate CNF for a certain application based on the most relevant parameters in each case.
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Affiliation(s)
- Jose Luis Sanchez-Salvador
- Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Cristina Campano
- Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain; Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas Margarita Salas (CIB-CSIC), 28040 Madrid, Spain
| | - Ana Balea
- Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Quim Tarrés
- Group LEPAMAP, Department of Chemical Engineering, University of Girona, C/M. Aurèlia Campmany 61, 17071 Girona, Spain
| | - Marc Delgado-Aguilar
- Group LEPAMAP, Department of Chemical Engineering, University of Girona, C/M. Aurèlia Campmany 61, 17071 Girona, Spain
| | - Pere Mutjé
- Group LEPAMAP, Department of Chemical Engineering, University of Girona, C/M. Aurèlia Campmany 61, 17071 Girona, Spain
| | - Angeles Blanco
- Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Carlos Negro
- Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain.
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16
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Jin X, Ai W, Dong W. Lignocellulose degradation, biogas production and characteristics of the microbial community in solid-state anaerobic digestion of wheat straw waste. Life Sci Space Res (Amst) 2022; 32:1-7. [PMID: 35065755 DOI: 10.1016/j.lssr.2021.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 09/07/2021] [Accepted: 09/19/2021] [Indexed: 06/14/2023]
Abstract
Waste recycling is pivotal for deep space exploration or space habitation in life support systems (LSS) to enhance the material closure. This study investigated the enzymatic pretreatment and solid-state anaerobic digestion (SS-AD) of wheat straw as the major component of biomass waste in LSS for resource reclamation. Wheat straw compounds, such as cellulose, hemicellulose and lignin were significantly degraded after pretreatment with degradation at 37.47%, 46.96%, and 14.05%, respectively. SS-AD with the C/N ratio of 25 resulted in more intense lignocellulose degradation (74.20%) and more biogas yield (77.59 L/kg volatile solid) with 30 days digestion. The microbial community variation and diversity were analyzed that common fiber-degrading bacteria including Firmicutes, Bacteroidetes and Proteobacteria were dominant while the composition of the microbial genera shifted along with the digestion time. Moreover, a potential feasible strategy for biomass waste management in LSS by SS-AD was proposed.
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Affiliation(s)
- Xiangdan Jin
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China; Space Science and Technology Institute (Shenzhen), Shenzhen, 518117, China.
| | - Weidang Ai
- Space Science and Technology Institute (Shenzhen), Shenzhen, 518117, China; National key Laboratory of Human Factors Engineering, China Astronaut Research and Training Center, Beijing, 100094, China
| | - Wenyi Dong
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China; Public Platform for Technological Service in Urban Waste Reuse and Energy Regeneration, Shenzhen, 518055, China
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17
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Huang M, Huang S, Wang Q, Hayat K, Ahmad M, Ying R, Hussain S. Mixed pretreatment based on pectinase and cellulase accelerates the oil droplet coalescence and oil yield from olive paste. Food Chem 2022; 369:130915. [PMID: 34496318 DOI: 10.1016/j.foodchem.2021.130915] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/29/2021] [Accepted: 08/17/2021] [Indexed: 11/22/2022]
Abstract
Commercial enzymatic pretreatment is being classically used for enhancing the oil extraction yield in the olive oil industry in China. Nevertheless, the mechanism is not yet clearly defined. The aim was to study the action of pectinase and cellulase for improving the oil yield from the aspects of oil droplets coalescence and rheological properties changes of olive paste during malaxation process. From confocal laser scanning microscopy imaging, the bound oil droplets were released and gradually coalesced into larger droplets, eventually formed a continuous oil phase with enzymatic pretreatment. Furthermore, the mixed enzymatic pretreatment effectively decreased viscosity of the olive pastes and promoted the depolymerization and solubilization of pectic polymers involved in the cell-cell adhesion, thus further enhanced the oil extraction yield from 7.15 % to 11.68 % (w/w). Finally, the mixed enzymatic pretreatment improved the droplet release and coalescence, reduced the viscosity of olive paste, and increased the oil yield.
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18
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Bhushan S, Rana MS, Bhandari M, Sharma AK, Simsek H, Prajapati SK. Enzymatic pretreatment of algal biomass has different optimal conditions for biogas and bioethanol routes. Chemosphere 2021; 284:131264. [PMID: 34216928 DOI: 10.1016/j.chemosphere.2021.131264] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/27/2021] [Accepted: 06/15/2021] [Indexed: 06/13/2023]
Abstract
Enzymatic pretreatment is emerging as an efficient tool for the extraction of biofuel precursors from algal biomass. However, yardsticks for end-use directed selection of optimal pretreatment conditions are not yet identified. The present study, for the first time, reveals different optimal conditions for algal biomass solubilization and sugar release. Algal biomass pretreatment optimization was carried out using the Taguchi method. Crude enzyme from Aspergillus fischeri was found effective for pretreatment of Chlorella pyrenoidosa. Maximum sugar yield (190 mg g-1 biomass) from algal biomass was observed at a substrate concentration of 4 g L-1, with a 5% enzyme load at temperature 60°C, pH 5.5, and shaking speed of 80 rpm. In contrast, maximum sCOD (1350 mg g-1 biomass) was obtained at 2 g L-1 substrate concentration with enzyme load of 20% v/v, at 60°C, pH 4, and shaking speed of 100 rpm. Hence, the first set of conditions would be more beneficial for bioethanol production. Whereas another set of conditions would improve the biofuel production that requires maximum solubilization of algal biomass, such as fermentative methane production. Overall, the present observations established that process conditions required for enzymatic pretreatment of algal biomass should be selected according to the desired biofuel type.
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Affiliation(s)
- Shashi Bhushan
- Environment and Biofuel Research Lab (EBRL), Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee (IIT-R), Uttarakhand, 247667, India; Department of Agricultural and Biosystem Engineering, North Dakota State University (NDSU), North Dakota, 58102, USA
| | - Mohit Singh Rana
- Environment and Biofuel Research Lab (EBRL), Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee (IIT-R), Uttarakhand, 247667, India
| | - Mamta Bhandari
- Environment and Biofuel Research Lab (EBRL), Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee (IIT-R), Uttarakhand, 247667, India
| | - Ashwini Kumar Sharma
- Department of Chemical Engineering, Indian Institute of Technology Roorkee (IIT-R), Uttarakhand, 247667, India
| | - Halis Simsek
- Department of Agricultural and Biosystem Engineering, North Dakota State University (NDSU), North Dakota, 58102, USA
| | - Sanjeev Kumar Prajapati
- Environment and Biofuel Research Lab (EBRL), Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee (IIT-R), Uttarakhand, 247667, India.
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19
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Zhang S, Zou L, Wan Y, Ye M, Ye J, Li YY, Liu J. Using an expended granular sludge bed reactor for advanced anaerobic digestion of food waste pretreated with enzyme: The feasibility and its performance. Bioresour Technol 2020; 311:123504. [PMID: 32417658 DOI: 10.1016/j.biortech.2020.123504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 06/11/2023]
Abstract
The high content of solid organics in food waste (FW) results in a low and unstable anaerobic digestion (AD) efficiency. Improving methane production rate and process stability is attracting much attention towards advanced AD of FW. The feasibility of advanced AD of FW pretreated with enzyme was investigated by batch experiments and 164 days running of an expanded granular sludge bed (EGSB) reactor. Simulation study based on the results of batch experiments indicates it is possible to treat enzymatically pretreated FW using an EGSB reactor. During the running of an EGSB reactor, the organic loading rate went up to 20 g chemical oxygen demand (COD)/L.d, and the total COD removal rate reached 88%. The significance of this study is to achieve an advanced AD of enzymatically pretreated FW with a stable and efficient methane production with biogas residue being reduced greatly.
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Affiliation(s)
- Sitong Zhang
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Lianpei Zou
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Yulan Wan
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Min Ye
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Jiongjiong Ye
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China
| | - Yu-You Li
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Jianyong Liu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
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20
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Zhao X, Zheng Z, Cai Y, Zhao Y, Zhang Y, Gao Y, Cui Z, Wang X. Accelerated biomethane production from lignocellulosic biomass: Pretreated by mixed enzymes secreted by Trichoderma viride and Aspergillus sp. Bioresour Technol 2020; 309:123378. [PMID: 32380381 DOI: 10.1016/j.biortech.2020.123378] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/10/2020] [Accepted: 04/11/2020] [Indexed: 06/11/2023]
Abstract
Biological pretreatment is a promising technology to increase biogas yield. The methane yield and microbial community resulting from anaerobic digestion of maize straw after pretreatment of enzymes [extracted from Trichoderma viride (ETv) and Aspergillus sp. (EAs)] at different mixing ratios [5/0, 4/1, 3/2, 2/3, 1/4, 0/5] were evaluated. The methane yields from mixed enzymes pretreatment were higher than single enzymes pretreatments of ETv and EAs. The optimal enzymes mixing ratio of ETv and EAs was found to be 2/3, with the cumulative methane yield 512.64 mL/g TSadded, which was 31.74% higher than the control. Enzymatic pretreatment promoted an increase in the abundance of bacteria and archaea associated with cellulose decomposition. The majority of bacteria and archaea were assigned to Bacteroidetes, Firmicutes and Methanosaeta.
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Affiliation(s)
- Xiaoling Zhao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Zehui Zheng
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Yafan Cai
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Yubin Zhao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Yue Zhang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Youhui Gao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Zongjun Cui
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China
| | - Xiaofen Wang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, PR China.
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Zhen J, Tan M, Fu X, Shu W, Zhao X, Yang S, Xu J, Ma Y, Zheng H, Song H. High-level extracellular production of an alkaline pectate lyase in E. coli BL21 (DE3) and its application in bioscouring of cotton fabric. 3 Biotech 2020; 10:49. [PMID: 32002340 DOI: 10.1007/s13205-019-2022-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 12/18/2019] [Indexed: 10/25/2022] Open
Abstract
A high heterologous expression of an alkaline pectate lyase (APL) pelNK93I in E. coli was obtained through optimizing the lactose feeding and fed-batch fermentation. The highest soluble APL activity produced by E. coli BL21 (pET22b-pelNK93I) was 10,181 U/mL which is the highest level so far. On this basis, to improve the extracellular yield of APL, optimized glycine feeding was used to achieve elevated extracellular production of pelNK93I. The highest extracellular APL activity produced by E. coli BL21 (pET22b-pelNK93I) was 6357 U/mL which was also relatively higher than that in previous reports. The final productivity of APL was 282.8 U/mL/h in the fermentation of E. coli BL21 (pET22b-pelNK93I) in a 10 L fermenter. Thus the current study has provided a cost-effective method for the over-expression and preparation of alkaline pectate lyase pelNK93I for its industrial applications. Moreover, pelNK93I (4 U/mL) used for bioscouring increased cottonseed husk removal and radial capillary effect of cotton fabric by 37.63% and 47.06%, respectively, making it a promising enzyme in green textile technology.
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22
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Bian H, Dong M, Chen L, Zhou X, Ni S, Fang G, Dai H. Comparison of mixed enzymatic pretreatment and post-treatment for enhancing the cellulose nanofibrillation efficiency. Bioresour Technol 2019; 293:122171. [PMID: 31558340 DOI: 10.1016/j.biortech.2019.122171] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 09/17/2019] [Accepted: 09/18/2019] [Indexed: 06/10/2023]
Abstract
In this work, lignocellulosic nanofibrils (LCNF) produced from mechanical fibrillation with mixed enzymatic pretreatment or post-treatment were compared and the chemical composition, water retention value (WRV), average-number height and crystallinity for the obtained LCNF were evaluated. Compared to pure mechanical fibrillation, both mixed enzymatic pretreatment and post-treatment could efficiently facilitate cellulose nanofibrillation. Moreover, mixed enzymatic pretreatment was more suitable for LCNF production, resulting in a relatively higher WRV of 909% and smaller average-number height of 15 nm. These discoveries provide new insights into a more efficient biological method for the production and application of cellulose nanomaterials.
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Affiliation(s)
- Huiyang Bian
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Maolin Dong
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Lidong Chen
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Xuelian Zhou
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Shuzhen Ni
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China; State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
| | - Guigan Fang
- China Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Nanjing 210042, China
| | - Hongqi Dai
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China.
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23
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Banerjee R, Chintagunta AD, Ray S. Laccase mediated delignification of pineapple leaf waste: an ecofriendly sustainable attempt towards valorization. BMC Chem 2019; 13:58. [PMID: 31384806 PMCID: PMC6661841 DOI: 10.1186/s13065-019-0576-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 04/11/2019] [Indexed: 11/28/2022] Open
Abstract
Background Escalating energy security, burgeoning population and rising costs of fossil fuels have focussed our attention on tapping renewable energy sources. As the utilization of food crops for biofuel production culminates into food vs. fuel dilemma, there is an intensive need for alternatives. Production of biofuels from lignocellulosic biomass owing to its profuse availability and high holocellulose content is a promising area for research. Results In the present study, pineapple leaf, an agro-industrial waste was pretreated with laccase to enhance the enzymatic digestibility of the substrate for improved production of reducing sugar. Variables determining enzymatic delignification of pineapple leaf waste have been optimized by response surface methodology based on central composite design. Maximum delignification of 78.57%(w/w) resulted in reducing sugar of 492.33 ± 3.1 mg/g in 5.30 h. The structural changes in pineapple leaf waste, after laccase treatment, were studied through Fourier transformed infrared spectroscopy, X-ray diffraction and Scanning electron microscopy. Specific surface area, pore volume, and pore diameter of the substrate were studied using the Brunauer–Emmett–Teller and Barrett–Joyner–Halenda methods and found a significant increase in the aforementioned parameters after delignification. Conclusion Laccase mediated delignification of pineapple leaf waste is a cleaner sustainable process for enhanced production of reducing sugar which can accomplish the demand for biofuels.![]()
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Affiliation(s)
- Rintu Banerjee
- 1Agricultural & Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal 721302 India
| | - Anjani Devi Chintagunta
- 2Advanced Technology Development Centre, Indian Institute of Technology, Kharagpur, West Bengal 721302 India
| | - Subhabrata Ray
- 3Chemical Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal 721302 India
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Hosseini Koupaie E, Dahadha S, Bazyar Lakeh AA, Azizi A, Elbeshbishy E. Enzymatic pretreatment of lignocellulosic biomass for enhanced biomethane production-A review. J Environ Manage 2019; 233:774-784. [PMID: 30314871 DOI: 10.1016/j.jenvman.2018.09.106] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 09/07/2018] [Accepted: 09/30/2018] [Indexed: 05/25/2023]
Abstract
The rapid depletion of natural resources and the environmental concerns associated with the use of fossil fuels as the main source of global energy is leading to an increased interest in alternative and renewable energy sources. Particular interest has been given to the lignocellulosic biomass as the most abundant source of organic matter with a potential of being utilized for energy recovery. Different approaches have been applied to convert the lignocellulosic biomass to energy products including anaerobic digestion (AD), fermentation, combustion, pyrolysis, and gasification. The AD process has been proven as an effective technology for converting organic material into energy in the form of methane-rich biogas. However, the complex structure of the lignocellulosic biomass comprised of cellulose, hemicelluloses, and lignin hinders the ability of microorganisms in an AD process to degrade and convert these compounds to biogas. Therefore, a pretreatment step is essential to improve the degradability of the lignocellulosic biomass to achieve higher biogas rate and yield. A system that uses pretreatment and AD is known as advanced AD. Several pretreatment methods have been studied over the past few years including physical, thermal, chemical and biological pretreatment. This paper reviews the enzymatic pretreatment as one of the biological pretreatment methods which has received less attention in the literature than the other pretreatment methods. This paper includes a review of lignocellulosic biomass composition, AD process, challenges in degrading lignocellulosic materials, the current status of research to improve the biogas rate and yield from the AD of lignocellulosic biomass via enzymatic pretreatment, and the future trend in research for the reduction of enzymatic pretreatment cost.
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Affiliation(s)
- E Hosseini Koupaie
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
| | - S Dahadha
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
| | - A A Bazyar Lakeh
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
| | - A Azizi
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
| | - E Elbeshbishy
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada.
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25
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Wang S, Gao W, Chen K, Xiang Z, Zeng J, Wang B, Xu J. Deconstruction of cellulosic fibers to fibrils based on enzymatic pretreatment. Bioresour Technol 2018; 267:426-430. [PMID: 30032056 DOI: 10.1016/j.biortech.2018.07.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 06/08/2023]
Abstract
Enzymatic pretreatment has shown great potential in making the disintegration of cellulosic fibers to fibrils cost-effectively and environmental-friendly. In this study, an extensive commercial endoglucanase was used to pretreat cellulosic fibers for fibrillation. The pretreatment time and the enzyme dosage were optimized using response surface methodology. A 100% fiber recovery was obtained at endoglucanase usage of 9.0 mg/g (substrate) and pretreatment time of less than 3.0 h. A highly fibrillated and fractured surface of pretreated fibers was observed after 0.5 h of pretreatment compared to native fibers. Meanwhile, the progressive deconstruction of cellulosic fibers was occurred with the enzymatic pretreatment time increasing. The degree of deconstruction of fibers was evidenced by changes of the fiber microstructure, such as the inter-/intra-molecular H-bonds, the β-1,4-glucosidic linkages, crystallinity and crystallite size. These discoveries provide new insights into a more efficient and economic pretreatment methods for the disintegration of fibrils from cellulosic fibers.
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Affiliation(s)
- Shengdan Wang
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
| | - Wenhua Gao
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China.
| | - Kefu Chen
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
| | - Zhouyang Xiang
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China
| | - Jinsong Zeng
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
| | - Bin Wang
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
| | - Jun Xu
- State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
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26
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Yousuf A, Bastidas-Oyanedel JR, Schmidt JE. Effect of total solid content and pretreatment on the production of lactic acid from mixed culture dark fermentation of food waste. Waste Manag 2018; 77:516-521. [PMID: 29716759 DOI: 10.1016/j.wasman.2018.04.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 04/23/2018] [Accepted: 04/25/2018] [Indexed: 06/08/2023]
Abstract
Food waste landfilling causes environmental degradation, and this work assesses a sustainable food valorization technique. In this study, food waste is converted into lactic acid in a batch assembly by dark fermentation without pH control and without the addition of external inoculum at 37 °C. The effect of total solid (TS), enzymatic and aeration pretreatment was investigated on liquid products concentration and product yield. The maximum possible TS content was 34% of enzymatic pretreated waste, and showed the highest lactic acid concentration of 52 g/L, with a lactic acid selectivity of 0.6 glactic/gtotalacids. The results indicated that aeration pretreatment does not significantly improve product concentration or yield. Non-pretreated waste in a 29% TS system showed a lactic acid concentration of 31 g/L. The results showed that enzymatic pretreated waste at TS of 34% results in the highest production of lactic acid.
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Affiliation(s)
- Ahasa Yousuf
- Department of Chemical and Environmental Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates.
| | - Juan-Rodrigo Bastidas-Oyanedel
- Department of Chemical and Environmental Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates.
| | - Jens Ejbye Schmidt
- Department of Chemical and Environmental Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates.
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27
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Zhao X, Luo K, Zhang Y, Zheng Z, Cai Y, Wen B, Cui Z, Wang X. Improving the methane yield of maize straw: Focus on the effects of pretreatment with fungi and their secreted enzymes combined with sodium hydroxide. Bioresour Technol 2018; 250:204-213. [PMID: 29174897 DOI: 10.1016/j.biortech.2017.09.160] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 09/21/2017] [Accepted: 09/22/2017] [Indexed: 06/07/2023]
Abstract
In order to improve the methane yield, the alkaline and biological pretreatments on anaerobic digestion (AD) were investigated. Three treatments were tested: NaOH, biological (enzyme and fungi), and combined NaOH with biological. The maximum reducing sugar concentrations were obtained using Enzyme T (2.20 mg/mL) on the 6th day. The methane yield of NaOH + Enzyme A was 300.85 mL/g TS, 20.24% higher than the control. Methane yield obtained from Enzyme (T + A) and Enzyme T pretreatments were 277.03 and 273.75 mL/g TS, respectively, which were as effective as 1% NaOH (276.16 mL/g TS) in boosting methane production, and are environmentally friendly and inexpensive biological substitutes. Fungal pretreatment inhibited methane fermentation of maize straw, 15.68% was reduced by T + A compared with the control. The simultaneous reduction of DM, cellulose and hemicellulose achieved high methane yields. This study provides important guidance for the application of enzymes to AD from lignocellulosic agricultural waste.
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Affiliation(s)
- Xiaoling Zhao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Kai Luo
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Yue Zhang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Zehui Zheng
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Yafan Cai
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Boting Wen
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zongjun Cui
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Xiaofen Wang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
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28
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Long L, Tian D, Hu J, Wang F, Saddler J. A xylanase-aided enzymatic pretreatment facilitates cellulose nanofibrillation. Bioresour Technol 2017; 243:898-904. [PMID: 28738544 DOI: 10.1016/j.biortech.2017.07.037] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/05/2017] [Accepted: 07/06/2017] [Indexed: 05/14/2023]
Abstract
Although biological pretreatment of cellulosic fiber based on endoglucanases has shown some promise to facilitate cellulose nanofibrillation, its efficacy is still limited. In this study, a xylanase-aided endoglucanase pretreatment was assessed on the bleached hardwood and softwood Kraft pulps to facilitate the downstream cellulose nanofibrillation. Four commercial xylanase preparations were compared and the changes of major fiber physicochemical characteristics such as cellulose/hemicellulose content, gross fiber properties, fiber morphologies, cellulose accessibility/degree of polymerization (DP)/crystallinity were systematically evaluated before and after enzymatic pretreatment. It showed that the synergistic cooperation between endoglucanase and certain xylanase (Biobrite) could efficiently "open up" the hardwood Kraft pulp with limited carbohydrates degradation (<7%), which greatly facilitated the downstream cellulose nanofibrillation during mild sonication process (90Wh) with more uniform disintegrated nanofibril products (50-150nm, as assessed by scanning electron microscopy and UV-vis spectroscopy).
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Affiliation(s)
- Lingfeng Long
- Jiangsu Key Lab of Biomass-based Green Fuel & Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, PR China; Department of Wood Science, University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Dong Tian
- Department of Wood Science, University of British Columbia, Vancouver V6T 1Z4, Canada; Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Jinguang Hu
- Department of Wood Science, University of British Columbia, Vancouver V6T 1Z4, Canada.
| | - Fei Wang
- Jiangsu Key Lab of Biomass-based Green Fuel & Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, PR China
| | - Jack Saddler
- Department of Wood Science, University of British Columbia, Vancouver V6T 1Z4, Canada
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29
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Zhang D, Fu X, Dai X, Chen Y, Dai L. A new biological process for short-chain fatty acid generation from waste activated sludge improved by Clostridiales enhancement. Environ Sci Pollut Res Int 2016; 23:23972-23982. [PMID: 27638799 DOI: 10.1007/s11356-016-7579-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 09/01/2016] [Indexed: 06/06/2023]
Abstract
Short-chain fatty acids (SCFAs), the carbon source of biological nutrient removal, can be produced by waste activated sludge (WAS) anaerobic fermentation. To get more SCFAs from sludge, most studies in literature focused on the mechanical process control or the structure of microbial community; little attention has been paid to the key microorganisms and their function related to SCFA generation. In this study, a different sludge pretreated method, i.e., pretreating sludge by proteinase K for 2 days followed by pretreating at pH 10 for 4 days, is reported, by which the proportion of Clostridiales was increased and SCFA generation was enhanced. First, the effects of different proteinase K concentrations and initial pH on sludge hydrolysis and SCFA generation were investigated. The optimal conditions showed the highest SCFA generation (352.91 mg COD per gram of volatile suspended solids), which was 2.89-fold of the blank (un-pretreated). Further, the new biological pretreatment process led to the conversion of other SCFAs to acetic acid. Acetic acid accounted for 60.8 % of total SCFAs with the new biological pretreatment process compared with 44.9 % in the blank test. Then, the investigation on the key microorganisms related to SCFA production with 16S rRNA gene clone library and fluorescence in situ hybridization (FISH) indicated that there were much greater active Clostridiales when SCFAs were generated with the proteinase K and pH 10 pretreated sludge. Further, the mechanisms for the optimal conditions significantly enhancing SCFA generation were investigated. It was found that pretreating sludge by proteinase K and pH 10 caused the greatest key enzyme activities, organic consumption, and inhibition of methane generation. Graphical abstract A new biological process for short-chain fatty acid generation from waste activated sludge improved by Clostridiales enhancement.
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Affiliation(s)
- Dong Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Xiang Fu
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Xiaohu Dai
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Lingling Dai
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
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30
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Karray R, Hamza M, Sayadi S. Production and characterization of enzymatic cocktail produced by Aspergillus niger using green macroalgae as nitrogen source and its application in the pre-treatment for biogas production from Ulva rigida. Bioresour Technol 2016; 216:622-8. [PMID: 27285578 DOI: 10.1016/j.biortech.2016.05.067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/16/2016] [Accepted: 05/19/2016] [Indexed: 05/25/2023]
Abstract
Marine macroalgae are gaining more and more importance as a renewable feedstock for durable bioenergy production, but polysaccharides of this macroalgae are structurally complex in its chemical composition. The use of enzymatic hydrolysis may provide new pathways in the conversion of complex polysaccharides to fermentable sugars. In this study, an enzymatic cocktail with high specificity was first isolated from Aspergillus niger using the green macroalgae Ulva rigida as nitrogen source. The cocktail is rich on β-glucosidase, pectinase and carboxy-methyl-cellulase (CMCase). The highest activity was obtained with β-glucosidase (109IUmL(-1)) and pectinase (76IUmL(-1)), while CMCase present the lowest activity 4.6IUmL(-1). The U. rigida pre-treatment with this enzymatic cocktail showed high rate of reduced sugar release, and could bring promising prospects for enzymatic pre-treatment of the biogas production from U. rigida biomass which reached 1175mLgCODint(-1).
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Affiliation(s)
- Raida Karray
- Laboratoire de bioprocédés environnementaux, Laboratoire Mixte International (LMI) (Cosys-Med), Centre de Biotechnologie de Sfax, B.P. ''1177'', 3018 Sfax, Tunisia
| | - Manel Hamza
- Laboratoire de bioprocédés environnementaux, Laboratoire Mixte International (LMI) (Cosys-Med), Centre de Biotechnologie de Sfax, B.P. ''1177'', 3018 Sfax, Tunisia
| | - Sami Sayadi
- Laboratoire de bioprocédés environnementaux, Laboratoire Mixte International (LMI) (Cosys-Med), Centre de Biotechnologie de Sfax, B.P. ''1177'', 3018 Sfax, Tunisia.
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31
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Ma LT, Zhao ZM, Yu B, Chen HZ. Enzymatic Pretreatment Coupled with the Addition of p-Hydroxyanisole Increased Levulinic Acid Production from Steam-Exploded Rice Straw Short Fiber. Appl Biochem Biotechnol 2016; 180:945-953. [PMID: 27220515 DOI: 10.1007/s12010-016-2144-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 05/17/2016] [Indexed: 10/21/2022]
Abstract
Levulinic acid production, directly from lignocellulosic biomass, resulted in low yields due to the poor substrate accessibility and occurrence of side reactions. The effects of reaction conditions, enzymatic pretreatment, and inhibitor addition on the conversion of steam-exploded rice straw (SERS) short fiber to levulinic acid catalyzed by solid superacid were investigated systematically. The results indicated that the optimal reaction conditions were temperature, time, and solid superacid concentration combinations of 200 °C, 15 min, and 7.5 %. Enzymatic pretreatment improved the substrate accessibility to solid superacid catalyst, and p-hydroxyanisole inhibitor reduced the side reactions during reaction processes, which helped to increase levulinic acid yield. The levulinic acid yield reached 25.2 % under the optimal conditions, which was 61.5 % higher than that without enzymatic pretreatment and inhibitor addition. Therefore, enzymatic pretreatment coupled with the addition of p-hydroxyanisole increased levulinic acid production effectively, which contributed to the value-added utilization of lignocellulosic biomass.
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Affiliation(s)
- Li-Tong Ma
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Min Zhao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Bin Yu
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Hong-Zhang Chen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
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32
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Schroyen M, Vervaeren H, Vandepitte H, Van Hulle SWH, Raes K. Effect of enzymatic pretreatment of various lignocellulosic substrates on production of phenolic compounds and biomethane potential. Bioresour Technol 2015; 192:696-702. [PMID: 26094196 DOI: 10.1016/j.biortech.2015.06.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 06/08/2015] [Accepted: 06/10/2015] [Indexed: 05/16/2023]
Abstract
Pretreatment of lignocellulosic biomass is necessary to enhance the hydrolysis, which is the rate-limiting step in biogas production. Laccase and versatile peroxidase are enzymes known to degrade lignin. Therefore, the impact of enzymatic pretreatment was studied on a variety of biomass. A significant higher release in total phenolic compounds (TPC) was observed, never reaching the inhibiting values for anaerobic digestion. The initial concentration of TPC was higher in the substrates containing more lignin, miscanthus and willow. The anaerobic digestion of these two substrates resulted in a significant lower biomethane production (68.8-141.7 Nl/kg VS). Other substrates, corn stover, flax, wheat straw and hemp reached higher biomethane potential values (BMP), between 241 and 288 Nl/kg VS. Ensilaged maize reached 449 Nl/kg VS, due to the ensilation process, which can be seen as a biological and acid pretreatment. A significant relation (R(2) = 0.89) was found between lignin content and BMP.
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Affiliation(s)
- Michel Schroyen
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Belgium
| | - Han Vervaeren
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Belgium
| | - Hanne Vandepitte
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Belgium
| | - Stijn W H Van Hulle
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Belgium
| | - Katleen Raes
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Belgium.
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Kiran EU, Trzcinski AP, Liu Y. Enhancing the hydrolysis and methane production potential of mixed food waste by an effective enzymatic pretreatment. Bioresour Technol 2015; 183:47-52. [PMID: 25722182 DOI: 10.1016/j.biortech.2015.02.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 02/03/2015] [Accepted: 02/08/2015] [Indexed: 06/04/2023]
Abstract
In this study, a fungal mash rich in hydrolytic enzymes was produced by solid state fermentation (SSF) of waste cake in a simple and efficient manner and was further applied for high-efficiency hydrolysis of mixed food wastes (FW). The enzymatic pretreatment of FW with this fungal mash resulted in 89.1 g/L glucose, 2.4 g/L free amino nitrogen, 165 g/L soluble chemical oxygen demand (SCOD) and 64% reduction in volatile solids within 24h. The biomethane yield and production rate from FW pretreated with the fungal mash were found to be respectively about 2.3 and 3.5-times higher than without pretreatment. After anaerobic digestion of pretreated FW, a volatile solids removal of 80.4±3.5% was achieved. The pretreatment of mixed FW with the fungal mash produced in this study is a promising option for enhancing anaerobic digestion of FW in terms of energy recovery and volume reduction.
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Affiliation(s)
- Esra Uçkun Kiran
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Antoine P Trzcinski
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Yu Liu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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Ziemiński K, Kowalska-Wentel M. Effect of enzymatic pretreatment on anaerobic co-digestion of sugar beet pulp silage and vinasse. Bioresour Technol 2015; 180:274-280. [PMID: 25618496 DOI: 10.1016/j.biortech.2014.12.035] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 12/10/2014] [Accepted: 12/11/2014] [Indexed: 06/04/2023]
Abstract
Results of sugar beet pulp silage (SBPS) and vinasse (mixed in weight ratios of 3:1, 1:1 and 1:3, respectively) co-fermentation, obtained in this study, provide evidence that addition of too high amount of vinasse into the SBPS decreases biogas yields. The highest biogas productivity (598.1mL/g VS) was achieved at the SBPS-vinasse ratio of 3:1 (w/w). Biogas yields from separately fermented SBPS and vinasse were by 13% and 28.6% lower, respectively. It was found that enzymatic pretreatment of SBPS before methane fermentation that caused partial degradation of component polysaccharides, considerably increased biogas production. The highest biogas yield (765.5mL/g VS) was obtained from enzymatic digests of SBPS-vinasse (3:1) blend (27.9% more than from fermentation of the counterpart blend, which was not treated with enzymes). The simulation of potential biogas production from all the aforementioned mixtures using the Gompertz equation showed fair fit to the experimental results.
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Affiliation(s)
- Krzysztof Ziemiński
- Institute of Fermentation Technology and Microbiology, Lodz University of Technology, Poland.
| | - Monika Kowalska-Wentel
- Institute of Fermentation Technology and Microbiology, Lodz University of Technology, Poland
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Rajaram MR, Kumbhar BK, Singh A, Lohani UC, Shahi NC. Optimization of parameters for enhanced oil recovery from enzyme treated wild apricot kernels. J Food Sci Technol 2012; 49:482-488. [PMID: 23904657 PMCID: PMC3550897 DOI: 10.1007/s13197-011-0301-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 08/26/2010] [Accepted: 08/31/2010] [Indexed: 06/02/2023]
Abstract
Present investigation was undertaken with the overall objective of optimizing the enzymatic parameters i.e. moisture content during hydrolysis, enzyme concentration, enzyme ratio and incubation period on wild apricot kernel processing for better oil extractability and increased oil recovery. Response surface methodology was adopted in the experimental design. A central composite rotatable design of four variables at five levels was chosen. The parameters and their range for the experiments were moisture content during hydrolysis (20-32%, w.b.), enzyme concentration (12-16% v/w of sample), combination of pectolytic and cellulolytic enzyme i.e. enzyme ratio (30:70-70:30) and incubation period (12-16 h). Aspergillus foetidus and Trichoderma viride was used for production of crude enzyme i.e. pectolytic and cellulolytic enzyme respectively. A complete second order model for increased oil recovery as the function of enzymatic parameters fitted the data well. The best fit model for oil recovery was also developed. The effect of various parameters on increased oil recovery was determined at linear, quadric and interaction level. The increased oil recovery ranged from 0.14 to 2.53%. The corresponding conditions for maximum oil recovery were 23% (w.b.), 15 v/w of the sample, 60:40 (pectolytic:cellulolytic), 13 h. Results of the study indicated that incubation period during enzymatic hydrolysis is the most important factor affecting oil yield followed by enzyme ratio, moisture content and enzyme concentration in the decreasing order. Enzyme ratio, incubation period and moisture content had insignificant effect on oil recovery. Second order model for increased oil recovery as a function of enzymatic hydrolysis parameters predicted the data adequately.
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Affiliation(s)
- Mahatre R. Rajaram
- Department of Post Harvest Process and Food Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145 India
| | - Baburao K. Kumbhar
- Department of Post Harvest Process and Food Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145 India
| | - Anupama Singh
- Department of Post Harvest Process and Food Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145 India
| | - Umesh Chandra Lohani
- Department of Post Harvest Process and Food Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145 India
| | - Navin C. Shahi
- Department of Post Harvest Process and Food Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145 India
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