Key Laboratory of Clean Production and Utilization of Renewable Energy

Haidian District, China

Key Laboratory of Clean Production and Utilization of Renewable Energy

Haidian District, China

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Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | Zhou Y.,National Energy Randnter for Biomass | Zhang Z.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 12 more authors.
Renewable and Sustainable Energy Reviews | Year: 2016

Biomass is a sustainable and renewable energy source with relatively low pollution emissions. It can be transformed into gaseous, liquid and/or solid biofuels as well as other raw chemical materials and products. Among the biomass conversion technologies, densified solid biofuel is one of the means that is storable and transportable with low heating cost. In order to achieve the target of reducing the amount of carbon dioxide emissions per unit of Gross Domestic Product (GDP) by 40-45% until 2020 as set at the United Nations Framework Convention on Climate Change (UNFCCC), and realize the goal of China's 12th Five-year Plan (2011-2015) for the development of biomass energy, given that carbon emissions will peak in 2030 as estimated in 2014 during Asia-Pacific Economic Cooperation Conference, China should vigorously develop densified solid biofuel, so as to sharply minimize the unorganized burning of crop residues. This paper introduces the current status of China's densified solid biofuel and the industry in following aspects: (a) the classification of densified solid biofuel; (b) development of densified solid biofuel industry; (c) molding technology of densified solid biofuel; (d) characteristics of densified solid biofuel combustion; (e) the problems faced during molding, handling, transportation and storage; (f) existing Chinese standards for densified solid biofuel and the assessment of densified solid biofuel; and (g) market analysis and perspectives of densified solid biofuel and the industry. Moreover, this study provides a comprehensive overview of the development of China's densified solid biofuel and the related industry, proposes some recommendations for further development of the industry for domestic and international biomass energy researchers as well. © 2015 Elsevier Ltd. All rights reserved.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Liu Y.,China Agricultural University | Liu Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 7 more authors.
Bioresource Technology | Year: 2014

Anaerobic digestion wastewater (ADW), which contains large amount of nitrogen and phosphorus, particularly high concentration of ammonium, might lead to severely environmental pollution. A new unicellular green microalgae species from a wetland at the Olympic Forest Park, Beijing, China was screened based on its growth rates and nutrients removal capability under ADW. Results of 18s rDNA and ITS1 analysis indicated that this strain have a close relationship with Desmodesmus sp., named as EJ9-6. Desmodesmus sp. EJ9-6 could remove 100% NH4-N (68.691mg/L), TP (4.565mg/L) and PO4-P (4.053mg/L), and 75.50% TN (84.236mg/L) at 10.0% ADW, which the highest biomass production was 0.412g/L after 14d cultivation. Maximum nutrients removal was observed at 10.0% ADW with daily removal rates of TN, NH4-N, TP and PO4-P at 4.542, 5.284, 0.326 and 0.290mg/L/d, respectively. © 2014 Elsevier Ltd.


Li G.,China Agricultural University | Dong R.-J.,China Agricultural University | Dong R.-J.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Fu N.,Soochow University of China | And 4 more authors.
International Journal of Food Engineering | Year: 2016

Chlorella pyrenoidosa is one of the best candidates for biofuel production. The yield and chemical composition of decomposed products of Chlorella pyrenoidosa were determined using thermogravimetric analyzer (TGA), differential scanning calorimeter (DSC), and pyrolysis-gas chromatographic mass spectrometry (Py-GC/MS) by varying the temperature ranges. The results indicated that the main decomposition temperature of Chlorella pyrenoidosa was 294.53°C and up to 46.7% of the mass was lost. A complete decomposition of Chlorella pyrenoidosa was detected until 642.64°C. The pyrolysis of Chlorella pyrenoidosa at 800°C produced 63.58% (the maximum yield) of pyrolysis products compared to 40.22% at 300°C. It is suggested that the generation of pollutants during microalgae pyrolysis can be avoided by controlling the temperature at a relatively low stage (approximately 300°C). © 2016 by De Gruyter.


Li G.,China Agricultural University | Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Ji F.,Chinese Academy of Agricultural Sciences | And 4 more authors.
International Journal of Agricultural and Biological Engineering | Year: 2015

This paper described a comprehensive assessment of the pyrolysis process of 1 kg Desmodesmus sp. cultivated in BG11 medium at the optimum temperature by using life cycle assessment method. This assessment took 1 kg of Desmodesmus sp. as a functional unit, and chose energy efficiency analysis and potential environmental impact as assessment indices. The results showed that the energy conversion efficiency index of the pyrolysis process was above 1, which meant the pyrolysis process was beneficial. The primary impact of the pyrolysis process on the environment was eutrophication; which followed by photochemical ozone synthesis and acidification; and global warming impact was the last. The overall environmental impact during the whole life cycle was 1 347.63 mPET2000. © 2015, Chinese Society of Agricultural Engineering. All rights reserved.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Hao R.,China Agricultural University | Liu Y.,China Agricultural University | And 7 more authors.
Bioresource Technology | Year: 2013

A novel strain of unicellular green algae was isolated from fresh water samples collected from Yesanpo National Geopark, Laishui County of Hebei Province, China. The morphological and genomic identification of this strain was carried out using 18. s rRNA analysis. This novel strain was identified as Desmodesmus sp. named as EJ15-2.Environmental factors for biomass production of Desmodesmus sp. EJ15-2 grown under autotrophic condition (BG11 medium) was optimized using response surface methodology (RSM). A high correlation coefficient (R2=0.923, p≤0.01) indicated the adaptability of the second-order equation matched well with the growth condition of this strain. The optimal conditions for a relatively high biomass production (up to 0.758g/L) were at 30°C, 98μmol/m2/s and 14:10 (L:D), respectively. © 2013 Elsevier Ltd.


Li G.,China Agricultural University | Li G.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | And 9 more authors.
Energies | Year: 2013

Pyrolysis-gas chromatographic mass spectrometry (Py-GC/MS) was used to determine the yield and chemical composition of the pyrolysis products of Schizochytrium limacinum. The pyrolysis was carried out by varying the temperature from 300 °C to 800 °C. It was found that the main decomposition temperature of Schizochytrium limacinum was 428.16 °C, at which up to 66.5% of the mass was lost. A further 18.7% mass loss then occurred in a relatively slow pace until 760.2 °C due to complete decomposition of the ash content of Schizochytrium limacinum. The pyrolysis of Schizochytrium limacinum at 700 °C produced the maximum yield (67.7%) of pyrolysis products compared to 61.2% at 400 °C. While pollutants released at 700 °C (12.3%) was much higher than that of 400 °C (2.1%). Higher temperature will lead to more pollutant (nitrogen compounds and PAHs) release,which is harmful to the environment. Considering the reasonably high yield and minimum release of pollutants, a lower pyrolysis temperature (400 °C) was found to be optimum for producing biofuel from Schizochytrium limacinum. © 2013 by the authors.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 10 more authors.
Bioresource Technology | Year: 2015

Desmodesmus sp. was used in anaerobically digested wastewater (ADW) for nutrients removal and the biodiesel production was measured and compared using fed-batch cultivation was investigated and compared with batch cultivation. The Desmodesmus sp. was able to remove 236.143, 268.238 and 6.427mg/L of TN, NH4-N and PO4-P respectively after 40d of fed-batch cultivation, while in batch cultivation the quantities of TN, NH4-N and PO4-P removed were 33.331, 37.227 and 1.323mg/L. Biomass production of Desmodesmus sp. was also enhanced in fed-batch cultivation, when ADW loading was carried out every 2days; the biomass concentration peaked at 1.039g/L, which was three times higher than that obtained in batch cultivation (0.385g/L). The highest lipid production (261.8mg/L) was also recorded in fed-batch cultivation as compared to batch cultivation (83.3mg/L). Fed-batch cultivation of Desmodesmus sp. could provide effective control of nutrients limitation and/or ammonia inhibition on microalgae cultivation. © 2014 Elsevier Ltd.


Zhou Y.,China Agricultural University | Hao C.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Mao Z.,COFCO
American Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014 | Year: 2014

This study investigated the thermal properties curve, the change trend of peak temperature and heat flow of Chlorella pyrenoidosa protein by optimizing the extraction effect in different ultrasonic time, ultrasonic power and solid-to-liquid ratios. Results showed that the moisture content (dry basis) of dehydrated Chlorella pyrenoidosa for elemental analysis was 4.06%, major element contents including carbon, hydrogen, and nitrogen element was obtained as 46.03%, 6.41%, and 8.48%, respectively. The decomposition temperature of Chlorella pyrenoidosa was 294.53°C, while another decomposition peak point at 642.64°C and 8.475% of residue remained finally. Ultrasonic extraction for protein has a high efficiency and good effect. By analyzing the characteristic curve of Chlorella pyrenoidosa protein, some conclusions had been reached. (1) With the increasing of temperature, the peak temperature was decreased at first and then increased. The heat flow was relativeky stable. However, with the increasing of ultrasonic time, the stability of heat flow was changed because of the degeneration that may occur in the process extraction. (2) With the increasing of temperature, the peak temperature was decreased at first and then increased. The heat flow was volatile. However, high ultrasonic power is helpful to shorten the time of ultrasonic. (3) With the decreasing of solid-to-liquid ratio, the peak temperature was decreased at first and then increased. The heat flow was stable.


Xiao W.,China Agricultural University | Xiao W.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Chen X.,China Agricultural University | Zhang Y.,China Agricultural University | And 2 more authors.
Energy and Fuels | Year: 2016

The microwave-assisted methanolysis products from lignocellulose were analyzed with gas chromatography/mass spectrometry. Methyl levulinate (ML) and levoglucosenone derived from cellulose and furfural derived from hemicellulose were identified as the dominant compounds in corn stover methanolysis products. Only ML was revealed to accumulate rapidly over time in the methanolysis of cellulose and corn stover. The ML yields ranged from 34.9 to 84.5 mol % depending upon the starting materials varied among glucose, fructose, sucrose, cellulose, and corn stover. As a consequence of microwave dielectric heating, the ML yields from saccharides were increased significantly by 1.2-13.2 times compared to conventional heating. The results indicate that microwave-assisted methanolysis is a promising technology for the utilization of lignocellulosic materials. © 2016 American Chemical Society.


Li G.,China Agricultural University | Dong R.-J.,China Agricultural University | Dong R.-J.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Fu N.,Soochow University of China | And 4 more authors.
International Journal of Food Engineering | Year: 2015

The present study includes the compositional analysis and pyrolysis products obtained from Desmodesmus sp. cultivated in anaerobic digested effluents (DADE) from 300°C to 800°C. Compared to Desmodesmus sp. cultivated in BG11 (DBG11), both species exhibited a hydrogen content of ca. 6%, ca. 7% of nitrogen, and ca. 0.56% of sulfur except carbon content, of which was lower than DBG11. Pyrolysis products of DADE consisted of aliphatic hydrocarbons, aromatic hydrocarbons, acids, nitrogen compounds, phenols, polycyclic aromatic hydrocarbons (PAHs), alcohols, aldehydes, and furans. Pyrolysis of DADE at 800°C produced 62.52% (the maximum yield) of pyrolysis products compared to 41.89% at 600°C. Considering the reasonably high yield and minimum release of pollutants, lower temperature (600°C) was found to be optimum for producing biofuel from DADE. A process combing anaerobic digestion and algae cultivation can be proposed as a direct and effective way to produce biofuel so as to reduce contaminations to the environment. © 2015 by De Gruyter 2015.

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