The Experts below are selected from a list of 9954 Experts worldwide ranked by ideXlab platform
Lanlan Zhang - One of the best experts on this subject based on the ideXlab platform.
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attached cultivation for improving the Biomass Productivity of spirulina platensis
Bioresource Technology, 2015Co-Authors: Lanlan Zhang, Junfeng Wang, Yu Chen, Lin Chen, Zhaohui ZhangAbstract:To improve cultivation efficiency for microalgae Spirulina platensis is related to increase its potential use as food source and as an effective alternative for CO2 fixation. The present work attempted to establish a technique, namely attached cultivation, for S. platensis. Laboratory experiments were made firstly to investigate optimal conditions on attached cultivation. The optimal conditions were found: 25 g m (2) for initial inoculum density using electrostatic flocking cloth as substrata, light intensity lower than 200 mu mol m (2) s (1), CO2 enriched air flow (0.5%) at a superficial aeration rate of 0.0056 m s (1) in a NaHCO3-free Zarrouk medium. An outdoor attached cultivation bench-scale bioreactor was built and a 10 d culture of S. platensis was carried out with daily harvesting. A high footprint areal Biomass Productivity of 60 g m (2) d (1) was obtained. The nutrition of S. platensis with attached cultivation is identical to that with conventional liquid cultivation. (C) 2015 Elsevier Ltd. All rights reserved.
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Attached cultivation for improving the Biomass Productivity of Spirulina platensis
Bioresource Technology, 2015Co-Authors: Lanlan Zhang, Xin Gao, Junfeng Wang, Yu Chen, Lin Chen, Zhaohui Zhang, Tianzhong LiuAbstract:To improve cultivation efficiency for microalgae Spirulina platensis is related to increase its potential use as food source and as an effective alternative for CO2fixation. The present work attempted to establish a technique, namely attached cultivation, for S. platensis. Laboratory experiments were made firstly to investigate optimal conditions on attached cultivation. The optimal conditions were found: 25gm-2for initial inoculum density using electrostatic flocking cloth as substrata, light intensity lower than 200μmolm-2s-1, CO2enriched air flow (0.5%) at a superficial aeration rate of 0.0056ms-1in a NaHCO3-free Zarrouk medium. An outdoor attached cultivation bench-scale bioreactor was built and a 10d culture of S. platensis was carried out with daily harvesting. A high footprint areal Biomass Productivity of 60gm-2d-1was obtained. The nutrition of S. platensis with attached cultivation is identical to that with conventional liquid cultivation.
Zhaohui Zhang - One of the best experts on this subject based on the ideXlab platform.
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attached cultivation for improving the Biomass Productivity of spirulina platensis
Bioresource Technology, 2015Co-Authors: Lanlan Zhang, Junfeng Wang, Yu Chen, Lin Chen, Zhaohui ZhangAbstract:To improve cultivation efficiency for microalgae Spirulina platensis is related to increase its potential use as food source and as an effective alternative for CO2 fixation. The present work attempted to establish a technique, namely attached cultivation, for S. platensis. Laboratory experiments were made firstly to investigate optimal conditions on attached cultivation. The optimal conditions were found: 25 g m (2) for initial inoculum density using electrostatic flocking cloth as substrata, light intensity lower than 200 mu mol m (2) s (1), CO2 enriched air flow (0.5%) at a superficial aeration rate of 0.0056 m s (1) in a NaHCO3-free Zarrouk medium. An outdoor attached cultivation bench-scale bioreactor was built and a 10 d culture of S. platensis was carried out with daily harvesting. A high footprint areal Biomass Productivity of 60 g m (2) d (1) was obtained. The nutrition of S. platensis with attached cultivation is identical to that with conventional liquid cultivation. (C) 2015 Elsevier Ltd. All rights reserved.
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Attached cultivation for improving the Biomass Productivity of Spirulina platensis
Bioresource Technology, 2015Co-Authors: Lanlan Zhang, Xin Gao, Junfeng Wang, Yu Chen, Lin Chen, Zhaohui Zhang, Tianzhong LiuAbstract:To improve cultivation efficiency for microalgae Spirulina platensis is related to increase its potential use as food source and as an effective alternative for CO2fixation. The present work attempted to establish a technique, namely attached cultivation, for S. platensis. Laboratory experiments were made firstly to investigate optimal conditions on attached cultivation. The optimal conditions were found: 25gm-2for initial inoculum density using electrostatic flocking cloth as substrata, light intensity lower than 200μmolm-2s-1, CO2enriched air flow (0.5%) at a superficial aeration rate of 0.0056ms-1in a NaHCO3-free Zarrouk medium. An outdoor attached cultivation bench-scale bioreactor was built and a 10d culture of S. platensis was carried out with daily harvesting. A high footprint areal Biomass Productivity of 60gm-2d-1was obtained. The nutrition of S. platensis with attached cultivation is identical to that with conventional liquid cultivation.
Molina E Grima - One of the best experts on this subject based on the ideXlab platform.
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outdoor helical tubular photobioreactors for microalgal production modeling of fluid dynamics and mass transfer and assessment of Biomass Productivity
Biotechnology and Bioengineering, 2003Co-Authors: D O Hall, F Acien G Fernandez, Canizares E Guerrero, Molina E GrimaAbstract:The production of the microalga Phaeodactylum tricornutum in an outdoor helical reactor was analyzed. First, fluid dynamics, mass-transfer capability, and mixing of the reactor was evaluated at different superficial gas velocities. Performance of the reactor was controlled by power input per culture volume. A maximum liquid velocity of 0.32 m s(-1) and mass transfer coefficient of 0.006 s(-1) were measured at 3200 W m(-3). A model of the influence of superficial gas velocity on the following reactor parameters was proposed: gas hold-up, induced liquid velocity, and mass transfer coefficient, with the accuracy of the model being demonstrated. Second, the influence of superficial gas velocity on the yield of the culture was evaluated in discontinuous and continuous cultures. Mean daily values of culture parameters, including dissolved oxygen, Biomass concentration, chlorophyll fluorescence (F(v)/F(m) ratio), growth rate, Biomass Productivity, and photosynthetic efficiency, were determined. Different growth curves were measured when the superficial gas velocity was modified-the higher the superficial gas velocity, the higher the yield of the system. In continuous mode, Biomass Productivity increased by 35%, from 1.02 to 1.38 g L(-1) d(-1), when the superficial gas velocity increased from 0.27 to 0.41 m s(-1). Maximal growth rates of 0.068 h(-1), Biomass productivities up to 1.4 g L(-1) d(-1), and photosynthetic efficiency of up to 15% were obtained at the higher superficial gas velocity of 0.41 m s(-1). The fluorescence parameter, F(v)/F(m), which reflects the maximal efficiency of PSII photochemistry, showed that the cultures were stressed at average irradiances within the culture higher than 280 microE m(-2) s(-1) at every superficial gas velocity. For nonstressed cultures, the yield of the system was a function of average irradiance inside the culture, with the superficial gas velocity determining this relationship. When superficial gas velocity was increased, higher growth rates, Biomass productivities, and photosynthetic efficiencies were obtained for similar average irradiance values. The higher the superficial gas velocity, the higher the liquid velocity, with this increase enhancing the movement of the cells inside the culture. In this way the efficiency of the cells increased and higher Biomass concentrations and productivities were reached for the same solar irradiance.
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modeling of Biomass Productivity in tubular photobioreactors for microalgal cultures effects of dilution rate tube diameter and solar irradiance
Biotechnology and Bioengineering, 1998Co-Authors: F Acien G Fernandez, Garcia F Camacho, J Sanchez A Perez, J Fernandez M Sevilla, Molina E GrimaAbstract:A macromodel is developed for estimating the year-long Biomass Productivity of outdoor cultures of microalga in tubular photobioreactors. The model evaluates the solar irradiance on the culture surface as a function of day of the year and the geographic location. In a second step, the geometry of the system is taken into account in estimating the average irradiance to which the cells are exposed. Finally, the growth rate is estimated as a function of irradiance, taking into account photoinhibition and photolimitation. The model interconnects solar irradiance (an environmental variable), tube diameter (a design variable), and dilution rate (an operating variable). Continuous cultures in two different tubular photobioreactors were analyzed using the macromodel. The Biomass Productivity ranged from 0.50 to 2.04 g L−1 d−1, and from 1.08 to 2.76 g L−1 d−1, for the larger and the smaller tube diameter photobioreactors, respectively. The quantum yield ranged from 1.1 to 2.2 g E−1; the higher the incident solar radiation, the lower the quantum yield. Simultaneous photolimitation and photoinhibition of outdoor cultures was observed. The model reproduced the experimental results with less than 20% error. If photoinhibition was neglected, and a growth model that considered only photolimitation was used to fit the data, the error increased to 45%, thus reflecting the inadequacy of previous outdoor growth models that disregard photoinhibition. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 58: 605–616, 1998.
I K Mitsios - One of the best experts on this subject based on the ideXlab platform.
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Potential growth and Biomass Productivity of Miscanthus×giganteus as affected by plant density and N-fertilization in central Greece
Biomass and Bioenergy, 2020Co-Authors: Nicholas G Danalatos, Sotiris V Archontoulis, I K MitsiosAbstract:The potential growth and Biomass Productivity of Miscanthus x giganteus was investigated under constraint-free conditions during two years with appreciable different climatic conditions in central Greece, and under three different plant densities (0.66, 1, 2 pl m(-2)) and two different nitrogen dressings (N-0 = 50, N-1 = 100 kg N ha(-1)). The field experimental design was a 3 x 2 factorial split plot in four blocks. Plant height, tiller number, leaf area index and dry weight per plant component were measured in subsequent harvests throughout the growing periods of 2001 and 2002. It was found that fertilisation within the studied rates did not affect growth and Biomass Productivity of the crop, and no interaction between fertilization and plant density was observed in any of the samplings. Contrary to fertilization, a significant effect of plant density was found, with the denser populated plants (10,000-20,000pl ha(-1)) performing growth rates of 250-350kg ha(-1) d(-1) for large parts of the growing period, reaching maximum dry Biomass yields in excess of 38t ha(-1) in the more favorable year, 2002, and 28 tha(-1) in the warmer and drier year 2001. Such high yield potentials were explained by the particularly great assimilation rates of this crop that were also measured under light saturation and optimum temperature and water regimes. With such Biomass yields (11.2-15.2 t ha(-1) oil equivalent), obtainable particularly under modest fertilisation needs, Miscanthus sinensis should be considered as a very promising crop for Biomass production in Greece in the near future. (c) 2006 Elsevier Ltd. All rights reserved
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potential growth and Biomass Productivity of miscanthus giganteus as affected by plant density and n fertilization in central greece
Biomass & Bioenergy, 2007Co-Authors: Nicholas G Danalatos, Sotiris V Archontoulis, I K MitsiosAbstract:The potential growth and Biomass Productivity of Miscanthus x giganteus was investigated under constraint-free conditions during two years with appreciable different climatic conditions in central Greece, and under three different plant densities (0.66, 1, 2 pl m(-2)) and two different nitrogen dressings (N-0 = 50, N-1 = 100 kg N ha(-1)). The field experimental design was a 3 x 2 factorial split plot in four blocks. Plant height, tiller number, leaf area index and dry weight per plant component were measured in subsequent harvests throughout the growing periods of 2001 and 2002. It was found that fertilisation within the studied rates did not affect growth and Biomass Productivity of the crop, and no interaction between fertilization and plant density was observed in any of the samplings. Contrary to fertilization, a significant effect of plant density was found, with the denser populated plants (10,000-20,000pl ha(-1)) performing growth rates of 250-350kg ha(-1) d(-1) for large parts of the growing period, reaching maximum dry Biomass yields in excess of 38t ha(-1) in the more favorable year, 2002, and 28 tha(-1) in the warmer and drier year 2001. Such high yield potentials were explained by the particularly great assimilation rates of this crop that were also measured under light saturation and optimum temperature and water regimes. With such Biomass yields (11.2-15.2 t ha(-1) oil equivalent), obtainable particularly under modest fertilisation needs, Miscanthus sinensis should be considered as a very promising crop for Biomass production in Greece in the near future. (c) 2006 Elsevier Ltd. All rights reserved.
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Potential growth and Biomass Productivity of Miscanthus × giganteus as affected by plant density and N-fertilization in central Greece.
Biomass & Bioenergy, 2007Co-Authors: Nicholas G Danalatos, Sotiris V Archontoulis, I K MitsiosAbstract:The potential growth and Biomass Productivity of Miscanthus x giganteus was investigated under constraint-free conditions during two years with appreciable different climatic conditions in central Greece, and under three different plant densities (0.66, 1, 2 pl m(-2)) and two different nitrogen dressings (N-0 = 50, N-1 = 100 kg N ha(-1)). The field experimental design was a 3 x 2 factorial split plot in four blocks. Plant height, tiller number, leaf area index and dry weight per plant component were measured in subsequent harvests throughout the growing periods of 2001 and 2002. It was found that fertilisation within the studied rates did not affect growth and Biomass Productivity of the crop, and no interaction between fertilization and plant density was observed in any of the samplings. Contrary to fertilization, a significant effect of plant density was found, with the denser populated plants (10,000-20,000pl ha(-1)) performing growth rates of 250-350kg ha(-1) d(-1) for large parts of the growing period, reaching maximum dry Biomass yields in excess of 38t ha(-1) in the more favorable year, 2002, and 28 tha(-1) in the warmer and drier year 2001. Such high yield potentials were explained by the particularly great assimilation rates of this crop that were also measured under light saturation and optimum temperature and water regimes. With such Biomass yields (11.2-15.2 t ha(-1) oil equivalent), obtainable particularly under modest fertilisation needs, Miscanthus sinensis should be considered as a very promising crop for Biomass production in Greece in the near future. (c) 2006 Elsevier Ltd. All rights reserved.
Tianzhong Liu - One of the best experts on this subject based on the ideXlab platform.
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Attached cultivation for improving the Biomass Productivity of Spirulina platensis
Bioresource Technology, 2015Co-Authors: Lanlan Zhang, Xin Gao, Junfeng Wang, Yu Chen, Lin Chen, Zhaohui Zhang, Tianzhong LiuAbstract:To improve cultivation efficiency for microalgae Spirulina platensis is related to increase its potential use as food source and as an effective alternative for CO2fixation. The present work attempted to establish a technique, namely attached cultivation, for S. platensis. Laboratory experiments were made firstly to investigate optimal conditions on attached cultivation. The optimal conditions were found: 25gm-2for initial inoculum density using electrostatic flocking cloth as substrata, light intensity lower than 200μmolm-2s-1, CO2enriched air flow (0.5%) at a superficial aeration rate of 0.0056ms-1in a NaHCO3-free Zarrouk medium. An outdoor attached cultivation bench-scale bioreactor was built and a 10d culture of S. platensis was carried out with daily harvesting. A high footprint areal Biomass Productivity of 60gm-2d-1was obtained. The nutrition of S. platensis with attached cultivation is identical to that with conventional liquid cultivation.