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Quanguo Zhang - One of the best experts on this subject based on the ideXlab platform.
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continuous photo fermentative hydrogen production in a tubular photobioreactor using Corn Stalk pith hydrolysate with a consortium
International Journal of Hydrogen Energy, 2020Co-Authors: Danping Jiang, Tian Zhang, Huiliang Liu, Long Lin, Quanguo ZhangAbstract:Abstract Corn Stalk pith, a low-cost organic material, was first utilized to produce hydrogen by photo-fermentation in a long tubular photobioreactor (PBR) with continuous mode. The effect of hydraulic retention time (HRT: 12, 18, 24, 30 and 36 h) on hydrogen production and light conversion in the tubular PBR was evaluated. The distributions of cell optical density, pH, sugar and soluble metabolites products (SMPs) along the tubular PBR (0 cm, 25 cm, 50 cm, 75 cm, and 100 cm from the inlet) were also assessed under different HRTs. The HRT of 24 h was found to be the optimum condition with the highest hydrogen production (2670 mL), yield (211.9 mL/L-medium), hydrogen production rate (38.4 mL/L/h), and light conversion efficiency (0.42%). In addition, statistical analysis revealed that cell optical density, pH value, sugar concentration and SMPs varied with different locations of the tubular PBR. Moreover, HRT of 24 h and 36 h accounted for 2.6–1.3% and 4.0–11.8% of the total SMPs in the effluent, respectively. Besides, acetic acid and butyric acid were the main SMPs in the effluent.
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enhancement of converting Corn Stalk into reducing sugar by ultrasonic assisted ammonium bicarbonate pretreatment
Bioresource Technology, 2020Co-Authors: Youzhou Jiao, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Quanguo Zhang, Chao HeAbstract:Abstract In order to improve the yield of reducing sugar from Corn Stalk, ultrasonic-assisted ammonium bicarbonate pretreatment of Corn Stalk was proposed. Three ultrasonic factors (time (0–30 min), temperature (30–60 °C) and liquid/solid mass ratio (5–20)) were optimized by response surface experiment. The optimal conditions of ultrasonic pretreatment were obtained (liquid/solid mass ratio is 12:1, temperature is 42 °C and time is 11 min). The highest saccharification rate of Corn Stalk was of 82.61%, which was remarkably increased by 355% compared to the control group.
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ammonium bicarbonate pretreatment of Corn Stalk for improved methane production via anaerobic digestion kinetic modeling
Bioresource Technology, 2019Co-Authors: Chao He, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Junhui Zhao, Quanguo Zhang, Youzhou JiaoAbstract:Abstract This work studied the effects of ammonium carbonate pretreatment on biogas production during sequential anaerobic digestion. The results showed that the addition of ammonium bicarbonate (8%, w/w) obtained the highest biogas production of 14,690 mL with a yield of 222.6 mL g−1, which was 31% higher than that of un-pretreated (control experiment). Interestingly, the COD removal was increased by 100%. Furthermore, it was also helpful in stabilizing the pH of anaerobically digested Corn Stalk. Based on the results, the modified Gompertz equation fitted the cumulative biogas production curves very well, with high correlation coefficients (>0.994).
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photo fermentative hydrogen production from enzymatic hydrolysate of Corn Stalk pith with a photosynthetic consortium
International Journal of Hydrogen Energy, 2016Co-Authors: Danping Jiang, Tian Zhang, Huiliang Liu, Quanguo ZhangAbstract:Abstract Corn Stalk pith is a waste product of papermaking from Corn Stalk, and is easy to digest, which makes it a promising feedstock for biofuel production. The main aim of this study is to evaluate utilization of Corn Stalk pith for hydrogen production. Corn Stalk pith was hydrolyzed with commercial cellulase at 50 °C, and the hydrolysate was used as a carbon source for hydrogen production with a photosynthetic consortium. Effect of initial pH on sugar consumption, hydrogen production and byproducts accumulation was evaluated with initial reducing sugar concentrations of about 11 g/L. Single-factor experiments were conducted to determine optimal conditions. Substrate conversion efficiencies (82–94%) during photo-fermentation at initial pH of 6–9 were higher than those (40–80%) achieved in previous studies on hydrogen production from glucose using the same photosynthetic consortium. Hydrogen yield (2.6 ± 0.3 mol H 2 /mol sugar consumed) obtained at an initial pH of 7 was higher or comparable to those reported in literatures. During the photo-fermentation process, hydrogen was mainly produced via acetic acid production pathway in the first 24 h, and the butyric acid production pathway dominated the hydrogen production for the next 72 h. It was for the first time that Corn Stalk pith has been used for hydrogen production.
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economic environmental and social assessment of briquette fuel from agricultural residues in china a study on flat die briquetting using Corn Stalk
Energy, 2014Co-Authors: Tingzhou Lei, Zhiwei Wang, Xiaoyu Yan, Xinguang Shi, Quanguo ZhangAbstract:Abstract Biomass can be relatively easily stored and transported compared with other types of renewable energy sources. Crop straw can be converted into densified solid biofuel via briquette fuel technology to expand its possible applications and enhance its utilisation efficiency. However, the potential economic, environmental and social impacts of crop straw briquette fuel need to be assessed before its large-scale use. This paper provides a comprehensive evaluation of these impacts for a fully-operating 2 × 10 4 t/a Corn Stalk briquette fuel plant in China. The results show that with a life time of 15 years, a purchase price of 150 RMB/t for Corn Stalk and the current sales price of 400 RMB/t for briquette fuel, the plant has a net present value of 9.6 million RMB or 1.5 million USD, an internal rate of return of 36% and a short investment payback period of 4.4 years. The life cycle greenhouse gas emissions are found to be 323 t CO 2 ,e/year or 1 kg CO 2 ,e/GJ, much lower than that of coal. Additionally, the process reduces pollution by decreasing the amount of Corn Stalk that is discarded or burnt directly in the field. In terms of social impacts, the use of Corn Stalk briquetting fuel plant is expected to play an important role in increasing local residents' income, improving rural ecological environments, alleviating energy shortages, guaranteeing energy security, and promoting socialism new rural reconstruction.
Tianwei Tan - One of the best experts on this subject based on the ideXlab platform.
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effect of dilute alkaline pretreatment on the conversion of different parts of Corn Stalk to fermentable sugars and its application in acetone butanol ethanol fermentation
Bioresource Technology, 2016Co-Authors: Di Cai, Zhangfeng Luo, Peiyong Qin, Changjing Chen, Yong Wang, Zheng Wang, Tianwei TanAbstract:To investigate the effect of dilute alkaline pretreatment on different parts of biomass, Corn Stalk was separated into flower, leaf, cob, husk and stem, which were treated by NaOH in range of temperature and chemical loading. The NaOH-pretreated solid was then enzymatic hydrolysis and used as the substrate for batch acetone-butanol-ethanol (ABE) fermentation. The results demonstrated the five parts of Corn Stalk could be used as potential feedstock separately, with vivid performances in solvents production. Under the optimized conditions towards high product titer, 7.5g/L, 7.6g/L, 9.4g/L, 7g/L and 7.6g/L of butanol was obtained in the fermentation broth of flower, leaf, cob, husk and stem hydrolysate, respectively. Under the optimized conditions towards high product yield, 143.7g/kg, 126.3g/kg, 169.1g/kg, 107.7g/kg and 116.4g/kg of ABE solvent were generated, respectively.
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biomass to bio ethanol the evaluation of hybrid pennisetum used as raw material for bio ethanol production compared with Corn Stalk by steam explosion joint use of mild chemicals
Renewable Energy, 2016Co-Authors: Jingzhi Zhang, Yanliang Song, Bingwu Wang, Xu Zhang, Tianwei TanAbstract:The second generation biomass to bio-ethanol production is of growing interest. Energy crop were becoming important for second generation biomass to bio-ethanol production for their growth advantages. Hybrid Pennisetum as a new hybrid energy crop was selected as a model to compare with Corn Stalk. As pre-treatment methods, steam explosion and its combined action with dilute sulfuric acid, bisulfite, and mixed dilute acid and bisulfite were selected. The enzymatic hydrolysis demonstrated that the cellulose conversion is a strong function of the pre-treatment method applied, with Corn Stalk providing slightly better results. With dilute acid steam explosion (DA-SE), conversions were 67.6% and 54.5% for Corn Stalk and pennisetum, respectively. This can be attributed to the higher Cr. I of pennisetum (65.03%) than of Corn Stalk (54.05%). The cell lumen of pretreated pennisetum was smaller than for Corn Stalk as shown in SEM photos, meaning there was a substantially higher enzyme accessible surface and porosity in pennisetum, thus responsible for the higher cellulase adsorption of pretreated pennisetum. DA-SE was the most effective pre-treatment method, but the inhibitors' concentration was higher than in other methods. Combined dilute acid and bisulfite can moderately remove hemicelluloses and lignin. Cr. I values, lignin content, accessible surface and porosity were supplied the energy crop evaluation standards for bio-ethanol production.
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effect of acid pretreatment on different parts of Corn Stalk for second generation ethanol production
Bioresource Technology, 2016Co-Authors: Di Cai, Zhangfeng Luo, Peiyong Qin, Changjing Chen, Yong Wang, Changwei Zhang, Zheng Wang, Tianwei TanAbstract:In this study, the effects of different parts of Corn Stalk, including stem, leaf, flower, cob and husk on second generation ethanol production were evaluated. FTIR, XRD and SEM were performed to investigate the effect of dilute acid pretreatment. The bagasse obtained after pretreatment were further hydrolyzed by cellulase and used as the substrate for ethanol fermentation. As results, hemicelluloses fractions in different parts of Corn Stalk were dramatically removed and the solid fractions showed vivid compositions and crystallinities. Compared with other parts of Corn Stalk, the cob had higher sugar content and better enzymatic digestibility. The highest glucose yield of 94.2% and ethanol production of 24.0 g L(-1) were achieved when the cob was used as feedstock, while the glucose yield and the ethanol production were only 86.0% and 17.1 g L(-1) in the case of flower.
Youzhou Jiao - One of the best experts on this subject based on the ideXlab platform.
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enhancement of converting Corn Stalk into reducing sugar by ultrasonic assisted ammonium bicarbonate pretreatment
Bioresource Technology, 2020Co-Authors: Youzhou Jiao, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Quanguo Zhang, Chao HeAbstract:Abstract In order to improve the yield of reducing sugar from Corn Stalk, ultrasonic-assisted ammonium bicarbonate pretreatment of Corn Stalk was proposed. Three ultrasonic factors (time (0–30 min), temperature (30–60 °C) and liquid/solid mass ratio (5–20)) were optimized by response surface experiment. The optimal conditions of ultrasonic pretreatment were obtained (liquid/solid mass ratio is 12:1, temperature is 42 °C and time is 11 min). The highest saccharification rate of Corn Stalk was of 82.61%, which was remarkably increased by 355% compared to the control group.
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ammonium bicarbonate pretreatment of Corn Stalk for improved methane production via anaerobic digestion kinetic modeling
Bioresource Technology, 2019Co-Authors: Chao He, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Junhui Zhao, Quanguo Zhang, Youzhou JiaoAbstract:Abstract This work studied the effects of ammonium carbonate pretreatment on biogas production during sequential anaerobic digestion. The results showed that the addition of ammonium bicarbonate (8%, w/w) obtained the highest biogas production of 14,690 mL with a yield of 222.6 mL g−1, which was 31% higher than that of un-pretreated (control experiment). Interestingly, the COD removal was increased by 100%. Furthermore, it was also helpful in stabilizing the pH of anaerobically digested Corn Stalk. Based on the results, the modified Gompertz equation fitted the cumulative biogas production curves very well, with high correlation coefficients (>0.994).
Hongzhang Chen - One of the best experts on this subject based on the ideXlab platform.
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synergistic mechanism of steam explosion combined with fungal treatment by phellinus baumii for the pretreatment of Corn Stalk
Biomass & Bioenergy, 2014Co-Authors: Hongzhang ChenAbstract:Pretreatment was the essential step for industrial application of lignocellulosic biomass. Combination of steam explosion and fungal treatment was conducted, and synergistic mechanism of the combined pretreatment was evaluated in terms of pore size distribution, crystallinity index, chemical compositions and enzymatic hydrolysis. The results showed that steam explosion destroyed the rigid structure of Corn Stalk, increased pore size and porosity, and exposed crystalline component of cellulose. Steam explosion broke the lignin-carbohydrate-complex structure of lignocellulosic biomass and facilitated the fungal treatment. Phellinus bawnii could selectively degrade 34.7% and 36.58% of lignin for 1.4 MPa and 1.7 MPa steam-exploded Corn Stalk, respectively. As a result, the highest glucose yield of Corn Stalk pretreated by the condition of 1.7 MPa steam explosion associated with 21 d P. baumii reached 313.31 g kg(-1), which was 2.88 and 1.32 times higher than that of the untreated Corn Stalk and the 1.7 MPa steam-exploded Corn Stalk, respectively. The combined pretreatment enhanced the enzymatic hydrolysis, which was a promising technology that might be explored as alternative to the existing pretreatment. (C) 2014 Elsevier Ltd. All rights reserved.
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fractionation and characterization of lignin from steam exploded Corn Stalk by sequential dissolution in ethanol water solvent
Separation and Purification Technology, 2013Co-Authors: Guanhua Wang, Hongzhang ChenAbstract:Due to the intricate process of traditional lignin fractionation by multi-organic solvent extraction, single solvent system consisted of ethanol and water was established in this work to fractionate and purify lignin from steam-exploded Corn Stalk. Three alkali-extracted lignin fractions (Fraction 1, 2 and 3) were obtained by sequential dissolution and subsequently characterized by the following analysis technologies: GPC, HPLC, UV, FTIR and H-1 NMR spectra and thermogravimetric analysis. The GPC analysis showed the molecular weight of lignin fractions increased gradually from Fraction 1 to 3 and their polydispersity decreased dramatically compared with the unfractionated lignin. Besides, the purity of lignin Fraction 1 and 2 increased from 87.57% to 93.12% and 91.59% respectively due to the polysaccharide elimination effect of ethanol solutions. The subsequent characterization indicated that the content of phenolic acids decreased considerably from 3.379% to 0.095% with increasing molecular weight whereas the guaiacyl unit content and thermal stability increased. Meanwhile, the results of solubility determination revealed that the solubility of lignin enhanced when the molecular weight decreased and the water content of mixed solvent increased, which successfully elucidated the fractionation mechanism. Since ethanol is the only organic solvent used in the process, this study provides a relatively simple and efficient route to fractionate lignin from steam-exploded Corn Stalk for the subsequent utilization to produce stable and high-value lignin products. (C) 2013 Elsevier B.V. All rights reserved.
Chao He - One of the best experts on this subject based on the ideXlab platform.
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enhancement of converting Corn Stalk into reducing sugar by ultrasonic assisted ammonium bicarbonate pretreatment
Bioresource Technology, 2020Co-Authors: Youzhou Jiao, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Quanguo Zhang, Chao HeAbstract:Abstract In order to improve the yield of reducing sugar from Corn Stalk, ultrasonic-assisted ammonium bicarbonate pretreatment of Corn Stalk was proposed. Three ultrasonic factors (time (0–30 min), temperature (30–60 °C) and liquid/solid mass ratio (5–20)) were optimized by response surface experiment. The optimal conditions of ultrasonic pretreatment were obtained (liquid/solid mass ratio is 12:1, temperature is 42 °C and time is 11 min). The highest saccharification rate of Corn Stalk was of 82.61%, which was remarkably increased by 355% compared to the control group.
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ammonium bicarbonate pretreatment of Corn Stalk for improved methane production via anaerobic digestion kinetic modeling
Bioresource Technology, 2019Co-Authors: Chao He, Shanyue Guan, Zhiping Zhang, Shaopeng Wang, Junhui Zhao, Quanguo Zhang, Youzhou JiaoAbstract:Abstract This work studied the effects of ammonium carbonate pretreatment on biogas production during sequential anaerobic digestion. The results showed that the addition of ammonium bicarbonate (8%, w/w) obtained the highest biogas production of 14,690 mL with a yield of 222.6 mL g−1, which was 31% higher than that of un-pretreated (control experiment). Interestingly, the COD removal was increased by 100%. Furthermore, it was also helpful in stabilizing the pH of anaerobically digested Corn Stalk. Based on the results, the modified Gompertz equation fitted the cumulative biogas production curves very well, with high correlation coefficients (>0.994).