10 results on '"Youshan Sun"'
Search Results
2. Calcium peroxide pretreatment to facilitate the delignification and enzymatic hydrolysis of wheat straw
- Author
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Meiyan Wang, Xuyang Zhang, Youshan Sun, and Fei Wang
- Subjects
chemistry.chemical_compound ,Chemistry ,Enzymatic hydrolysis ,Calcium peroxide ,Straw ,Nuclear chemistry - Abstract
Calcium peroxide (CaO2) pretreatment was employed to remove lignin and subsequently facilitate enzymatic digestibility of wheat straw. An optimal condition was obtained at 130°C for 10 min with 0.35 g CaO2/g dried material of wheat straw and a 1:8 solid-liquid ratio. Under this condition, 57.8% of initial lignin, 7.2% of initial glucan, and 30.6% of initial xylan were removed from CaO2 pretreatment, respectively, meanwhile, a glucose recovery of 90.6 % and a xylose recovery of 65.9 % were obtained from the subsequent enzymatic hydrolysis of treated wheat straw, respectively. CaO2 pretreatment was proved to be a very effective method in delignification and improving enzymatic digestibility. Compared to raw material, the complex structure of lignocellulose was drastically disrupted with a wide emergence of scaly bulges and fully exposed microfibers, which still retained in the solid.
- Published
- 2021
3. Effect of Drying Method of Corn Stover on Sugar Recovery during Dilute Sulfuric Acid Pretreatment
- Author
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Yan Yao, Youshan Sun, Jiaying Yu, and Shuting Zhang
- Subjects
chemistry.chemical_classification ,Environmental Engineering ,Chromatography ,genetic structures ,Sulfuric acid ,Reducing sugar ,body regions ,chemistry.chemical_compound ,Corn stover ,chemistry ,Agronomy ,Yield (chemistry) ,Environmental Chemistry ,Air drying ,Sugar ,Waste Management and Disposal - Abstract
The effects of drying method on the sugar conversion of corn stover during dilute sulfuric acid pretreatment were studied. Oven-dried corn stover (ODCS) was more sensitive to temperature and time during dilute sulfuric acid pretreatment than air-dried corn stover (ADCS). The yield of the total reducing sugar reached 43.9% when ODCS was pretreated for 50 min at 120°C, which was even higher than the value of the ADCS treated for 90 min. The glucose yield of ODCS was 1.6- to 1.9-fold higher than ADCS. These results indicate that rapidly losing water is a better drying method compared to air drying.
- Published
- 2016
4. Particle Agglomeration in Bipolar Barb Agglomerator Under AC Electric Field
- Author
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Chao Huang, Xiuqin Ma, Youshan Sun, Meiyan Wang, Changping Zhang, and Yueya Lou
- Subjects
Flue gas ,Flow velocity ,Chemistry ,Economies of agglomeration ,Electric field ,Particle ,Nanotechnology ,Electric potential ,Composite material ,Condensed Matter Physics ,Voltage ,Volumetric flow rate - Abstract
The development of an efficient technology for removing fine particles in flue gas is essential as the haze is becoming more and more serious. To improve agglomeration effectiveness of fine particles, a dual zone electric agglomeration device consisting of a charging chamber and an agglomeration chamber with bipolar barb electrodes was developed. The bipolar barb electric agglomerator with a polar distance of 200 mm demonstrates good agglomeration effectiveness for particles with a size less than 8.0 μm under applied AC electric field. An optimal condition for achieving better agglomeration effectiveness was found to be as follows: flue gas flow velocity of 3.00 m/s, particle concentration of 2.00 g/m3, output voltage of 35 kV and length of the barb of 16 mm. In addition, 4.0–6.0 μm particles have the best effectiveness with the variation of particle volume occupancy of −3.2.
- Published
- 2015
5. Two-step pretreatment of corn stalk silage for increasing sugars production and decreasing the amount of catalyst
- Author
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Shuting Zhang, Youshan Sun, Runjuan Wang, and Xuebin Lu
- Subjects
Crop residue ,Environmental Engineering ,Silage ,Carbohydrates ,Bioengineering ,Ferric Compounds ,Zea mays ,Catalysis ,Hydrolysis ,Biogas ,Polysaccharides ,Bioenergy ,Food science ,Cellulose ,Fermentable sugar ,Waste Management and Disposal ,Nitrates ,Xylose ,Plant Stems ,Renewable Energy, Sustainability and the Environment ,Chemistry ,General Medicine ,Arabinose ,Glucose ,Agronomy ,Stalk ,Biotechnology - Abstract
The study investigated the effects of two-step pretreatment on fermentable sugar production from corn stalk silage. In the first step, the corn stalk silage was extracted by tepid water and then the solid was pretreated using Fe(NO 3 ) 3 as catalyst. The results showed that 45.8 g/100 g DM total sugars was obtained and the surface of remaining solid was seriously damaged after two-step pretreatment. Compared with one-step pretreatment, the production of total sugars increased by 23.8% and the amount of the catalyst of Fe(NO 3 ) 3 decreased by 28.8%. This research provides a new effective, suitable and economical pretreatment method for biogas production from corn stalk.
- Published
- 2012
6. Pretreatment of Corn Stover Silage with Fe(NO3)3 for Fermentable Sugar Production
- Author
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Rui Zhang, Xinying Wang, Youshan Sun, Xuebin Lu, and Shuting Zhang
- Subjects
Arabinose ,Hot Temperature ,Silage ,Severity factor ,Carbohydrates ,Bioengineering ,Xylose ,Ferric Compounds ,Zea mays ,Applied Microbiology and Biotechnology ,Biochemistry ,chemistry.chemical_compound ,Hydrolysis ,Hemicellulose ,Food science ,Sugar ,Molecular Biology ,Nitrates ,Bacteria ,General Medicine ,Corn stover ,chemistry ,Agronomy ,Fermentation ,Carbohydrate Metabolism ,Biotechnology - Abstract
Corn stover silage is an attractive raw material for the production of biofuels and chemicals due to its high content of carbohydrates and easy degradability. The effects of Fe(NO(3))(3) pretreatment conditions on sugar yields were investigated for corn stover silage. In addition, a combined severity factor was used to evaluate the effect of pretreatment conditions on the concentration of total sugars and inhibitors. Optimum pretreatment condition was obtained at 150 °C for 10 min with 0.05 M Fe(NO(3))(3), at which the yields of soluble xylose and glucose in liquid achieved 91.80% of initial xylose, 96.74% of initial arabinose and 19.09% of initial glucose, respectively, meanwhile, 91.84% of initial xylose, 98.24% of initial arabinose, and 19.91% of initial glucose were removed. In addition, a severity analysis showed that the maximum sugar concentration of 33.48 g/l was achieved at combined severity parameter value of 0.62, while the inhibitor concentration was only 0.03 g/l. Fe(NO(3))(3) is an effective catalyst to enhance hemicellulose hydrolysis in corn stover silage, the yields of monomeric xylose in the liquid fraction reached as high as 91.06% of initial xylose and 96.22% of initial arabinose, respectively.
- Published
- 2011
7. Kinetic study for Fe(NO3)3 catalyzed hemicellulose hydrolysis of different corn stover silages
- Author
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Xinying Wang, Xuebin Lu, Youshan Sun, Shuting Zhang, and Rui Zhang
- Subjects
Environmental Engineering ,Silage ,Bioengineering ,In Vitro Techniques ,Xylose ,Ferric Compounds ,Zea mays ,Catalysis ,chemistry.chemical_compound ,symbols.namesake ,Hydrolysis ,Polysaccharides ,Hemicellulose ,Waste Management and Disposal ,Arrhenius equation ,Nitrates ,Plant Extracts ,Renewable Energy, Sustainability and the Environment ,General Medicine ,Plant Components, Aerial ,Straw ,Kinetics ,Corn stover ,chemistry ,Biochemistry ,symbols ,Nuclear chemistry - Abstract
Five inorganic salts, ZnCl 2 , FeSO 4 , Fe 2 (SO 4 ) 3 , FeCl 3 and Fe(NO 3 ) 3 were chosen as catalysts to determine their effects on hemicellulose hydrolysis in control silage (no silage additive), and the results indicated that Fe(NO 3 ) 3 was the most efficient catalyst for hemicellulose hydrolysis. The kinetics of Fe(NO 3 ) 3 catalyzed hydrolysis for control silage and acid silage (treatment with HNO 3 ) were investigated at various pretreatment conditions. The results demonstrated that Saeman model was well consistent with Fe(NO 3 ) 3 catalyzed hydrolysis reaction for corn stover silage, and kinetic parameters for this model were developed by the Arrhenius equation. Optimum pretreatment conditions were 0.05 M Fe(NO 3 ) 3 at 150 °C for 21.2 min for control silage and 12.7 min for acid silage, which obtained the maximum xylose yields 81.66% and 93.36% of initial xylan, respectively. The activation energies for hemicellulose hydrolysis in control and acid silage ranged from 44.35 to 86.14 kJ/mol and from 3.11 to 34.11 kJ/mol, respectively.
- Published
- 2011
8. Modeling and optimization of dilute nitric acid hydrolysis on corn stover
- Author
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Rui Zhang, Xuebin Lu, Shuting Zhang, Xinying Wang, and Youshan Sun
- Subjects
Chromatography ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Organic Chemistry ,Lignocellulosic biomass ,Xylose ,Furfural ,Pollution ,Inorganic Chemistry ,chemistry.chemical_compound ,Hydrolysis ,Acetic acid ,Fuel Technology ,Corn stover ,chemistry ,Nitric acid ,Organic chemistry ,Acid hydrolysis ,Waste Management and Disposal ,Biotechnology - Abstract
BACKGROUND: Because of its high cost, nitric acid has not been widely employed as the catalyst for hydrolysis of lignocellulosic biomass to obtain fermentable sugars. However, recently more and more research results have reported that nitric acid was more effective than other acids for the hydrolysis of lignocellulose. Therefore, it is necessary to find an optimum condition for nitric acid pretreatment and a means of reducing the cost. RESULTS: In this work, low concentrations of nitric acid and short reaction times were considered to optimize the pretreatment process. The kinetic parameters of models to predict the concentrations of xylose, glucose, arabinose, acetic acid and furfural in the hydrolysates were obtained. Applying the kinetic models, the optimum conditions were: 150 °C, 0.6% HNO3 and 1 min, which yielded a solution containing up to 22.01 g L−1 xylose, 1.91 g L−1 glucose, 2.90 g L−1 arabinose, 2.42 g L−1 acetic acid and 0.21 g L−1 furfural, which were consistent with the predicted values. The influence of temperature was also studied using the Arrhenius equation. CONCLUSIONS: A combination of experimental data and model analysis suggested that 96% xylose yield can be achieved by using low concentration nitric acid for a short reaction time, which could greatly reduce the pretreatment cost. Therefore, dilute nitric acid could be considered a good choice for the hydrolysis of corn stover. Copyright © 2010 Society of Chemical Industry
- Published
- 2010
9. Low energy consumption vortex wave flow membrane bioreactor.
- Author
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Zhiqiang Wang, Weilong Dong, Xiaohong Hu, Tianyu Sun, Tao Wang, and Youshan Sun
- Subjects
ENERGY consumption ,BIOREACTORS ,BIOFILMS ,WATER quality ,REYNOLDS number ,LAMINAR flow - Abstract
In order to reduce the energy consumption and membrane fouling of the conventional membrane bioreactor (MBR), a kind of low energy consumption vortex wave flow MBR was exploited based on the combination of biofilm process and membrane filtration process, as well as the vortex wave flow technique. The experimental results showed that the vortex wave flow state in the membrane module could be formed when the Reynolds number (Re) of liquid was adjusted between 450 and 1,050, and the membrane flux declined more slowly in the vortex wave flow state than those in the laminar flow state and turbulent flow state. The MBR system was used to treat domestic wastewater under the condition of vortex wave flow state for 30 days. The results showed that the removal efficiency for CODcr and NH
3 -N was 82% and 98% respectively, and the permeate quality met the requirement of 'Water quality standard for urban miscellaneous water consumption (GB/T 18920-2002)'. Analysis of the energy consumption of the MBR showed that the average energy consumption was 1.90±0.55 kWh/m³ (permeate), which was only two thirds of conventional MBR energy consumption. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
10. Pretreatment of Corn Stover Silage with Fe(NO) for Fermentable Sugar Production.
- Author
-
Youshan Sun, Xuebin Lu, Rui Zhang, Xinying Wang, and Shuting Zhang
- Abstract
Corn stover silage is an attractive raw material for the production of biofuels and chemicals due to its high content of carbohydrates and easy degradability. The effects of Fe(NO) pretreatment conditions on sugar yields were investigated for corn stover silage. In addition, a combined severity factor was used to evaluate the effect of pretreatment conditions on the concentration of total sugars and inhibitors. Optimum pretreatment condition was obtained at 150 °C for 10 min with 0.05 M Fe(NO), at which the yields of soluble xylose and glucose in liquid achieved 91.80% of initial xylose, 96.74% of initial arabinose and 19.09% of initial glucose, respectively, meanwhile, 91.84% of initial xylose, 98.24% of initial arabinose, and 19.91% of initial glucose were removed. In addition, a severity analysis showed that the maximum sugar concentration of 33.48 g/l was achieved at combined severity parameter value of 0.62, while the inhibitor concentration was only 0.03 g/l. Fe(NO) is an effective catalyst to enhance hemicellulose hydrolysis in corn stover silage, the yields of monomeric xylose in the liquid fraction reached as high as 91.06% of initial xylose and 96.22% of initial arabinose, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
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