Entity

Time filter

Source Type


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. Source


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Ji F.,Chinese Academy of Agricultural Sciences | Wang Y.K.,Chinese Academy of Agricultural Sciences | And 6 more authors.
International Journal of Agricultural and Biological Engineering | Year: 2015

In order to isolate a well-tolerated microalgae strain and study its capability of wastewater treatment, a newly microalgae strain was isolated and identified from fresh water. The phylogenetic analysis indicates that this strain has a close relationship with Desmodesmus sp., named as EJ 9-2. The effects of temperature, pH value and NaCl concentration on growth of Desmondesmus sp. were investigated; the capability of nutrient removal from alkaline wastewater was also observed. Desmodesmus sp. EJ 9-2 had a wide pH adaptation range (3-12) and could remove nitrogen, phosphorus and COD which might substantially decrease the cost of biofuel production. The research can provide evidence for outdoor large-scale cultivation of microalgae. © 2015, Int J Agric & Biol Eng. All rights reserved. Source


Ji F.,China Agricultural University | Hao R.,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 5 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

With the aim of isolating a high biomass accumulation strain and optimize environmental factors to enhance its biomass production, an unicellular green algae was isolated from fresh water samples, the morphological and genomic characterization identification of this strain was carried out by using 18s rRNA and ITS1 analysis. This newly isolated strain named EJ12-3 was identified as Desmodesmus sp. The environmental factors for biomass production of Desmodesmus sp. EJ12-3 was optimized by using response surface methodology (RSM). The experimental and the predicted values were very close which reflected the accuracy and the applicability of RSM (R2=0.950). According to the results, the optimal condition for biomass production within the experimental range of the variables studied was: temperature of 28°C, light intensity of 131 μmol/(m2·s), light/dark cycle of 15:9 and pH value of 6.0. Under this condition, the predicted biomass production value was up to (0.648±0.015) g/L. Source


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. Source


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. Source

Discover hidden collaborations