The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Junhu Zhou - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation on promoting Light Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern shaped draft tube
    Bioresource Technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

  • Numerical simulation on promoting Light/Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern-shaped draft tube.
    Bioresource technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

Jun Cheng - One of the best experts on this subject based on the ideXlab platform.

  • improving Light distribution and Light Dark Cycle of 900 l tangential spiral flow column photobioreactors to promote co2 fixation with arthrospira sp cells
    Science of The Total Environment, 2020
    Co-Authors: Jun Cheng, Shuzheng Liu, Yi Qiu, Ze Zhang, Wangbiao Guo
    Abstract:

    Abstract The Light distribution and Light/Dark Cycle were improved in 900 L tangential spiral-flow column photobioreactors (TSCP) to promote CO2 fixation with Arthrospira sp. cells. Solar irradiation model was employed in CFD simulation to investigate Light distribution and Light/Dark Cycle in flow field composed of culture medium, CO2 bubbles and Arthrospira sp. cells under actual sunLight irradiation considering geolocation and time. An accurate way to divide Light/Dark zone based on saturate Light intensity and Light intensity field was adopted for the first time. When Arthrospira sp. cell concentration increased from 0.1 to 0.9 g/L, Light/Dark Cycle frequency of cells firstly increased from 0.650 Hz to 0.868 Hz and then decreased to 0.117 Hz. Intracellular chlorophyll a content and carotenoids content of Arthrospira sp. cells in TSCP were 6% and 41% higher than those in conventional bubble column photobioreactor. This promoted cellular photosynthesis and stress resistance, which contributed to increase CO2 fixation rate of Arthrospira sp. cells by 59%. When CO2 aeration rate, CO2 volume concentration, and circulating pump power were 0.210 L/min, 15%, and 30 W, chlorophyll a content, helix pitch, and CO2 fixation rate of Arthrospira sp. cells all reached peak values of 8.769 mg/L, 78.26 μm and 0.358 g/L/d, respectively.

  • numerical simulation on promoting Light Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern shaped draft tube
    Bioresource Technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

  • Numerical simulation on promoting Light/Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern-shaped draft tube.
    Bioresource technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

Wangbiao Guo - One of the best experts on this subject based on the ideXlab platform.

  • improving Light distribution and Light Dark Cycle of 900 l tangential spiral flow column photobioreactors to promote co2 fixation with arthrospira sp cells
    Science of The Total Environment, 2020
    Co-Authors: Jun Cheng, Shuzheng Liu, Yi Qiu, Ze Zhang, Wangbiao Guo
    Abstract:

    Abstract The Light distribution and Light/Dark Cycle were improved in 900 L tangential spiral-flow column photobioreactors (TSCP) to promote CO2 fixation with Arthrospira sp. cells. Solar irradiation model was employed in CFD simulation to investigate Light distribution and Light/Dark Cycle in flow field composed of culture medium, CO2 bubbles and Arthrospira sp. cells under actual sunLight irradiation considering geolocation and time. An accurate way to divide Light/Dark zone based on saturate Light intensity and Light intensity field was adopted for the first time. When Arthrospira sp. cell concentration increased from 0.1 to 0.9 g/L, Light/Dark Cycle frequency of cells firstly increased from 0.650 Hz to 0.868 Hz and then decreased to 0.117 Hz. Intracellular chlorophyll a content and carotenoids content of Arthrospira sp. cells in TSCP were 6% and 41% higher than those in conventional bubble column photobioreactor. This promoted cellular photosynthesis and stress resistance, which contributed to increase CO2 fixation rate of Arthrospira sp. cells by 59%. When CO2 aeration rate, CO2 volume concentration, and circulating pump power were 0.210 L/min, 15%, and 30 W, chlorophyll a content, helix pitch, and CO2 fixation rate of Arthrospira sp. cells all reached peak values of 8.769 mg/L, 78.26 μm and 0.358 g/L/d, respectively.

  • numerical simulation on promoting Light Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern shaped draft tube
    Bioresource Technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

  • Numerical simulation on promoting Light/Dark Cycle frequency to improve microalgae growth in photobioreactor with serial lantern-shaped draft tube.
    Bioresource technology, 2018
    Co-Authors: Jun Cheng, Wangbiao Guo, Junhu Zhou
    Abstract:

    Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-Light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10-4 m2/s2 to 26.6 × 10-4 m2/s2, thus increasing Light/Dark Cycle frequency by 54%. The Light/Dark Cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the Light/Dark Cycle frequency and Light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO2 fixation peak rate was promoted by 35%.

Yingping Zhuang - One of the best experts on this subject based on the ideXlab platform.

  • effects of Light Dark Cycle mixing pattern and partial pressure of h2 on biohydrogen production by rhodobacter sphaeroides zx 5
    Bioresource Technology, 2011
    Co-Authors: Yonghong Wang, Siliang Zhang, Ju Chu, Mingzhi Huang, Ming Zhang, Yingping Zhuang
    Abstract:

    Abstract The effects of Light/Dark Cycle, mixing pattern and partial pressure of H 2 on the growth and hydrogen production of Rhodobacter sphaeroides ZX-5 were investigated. The results from Light/Dark Cycle culture showed that little or no hydrogen production was observed during the Dark periods, and the hydrogen production immediately recovered once illumination was resumed. Also, it was found that the optimum condition of shaking velocity was 120 rpm for hydrogen photo-fermentation. Meanwhile, shaking during H 2 production phase (i.e., cell growth stationary phase) of photo-fermentation played a crucial role on effectively enhancing the phototrophic hydrogen production, rather than that during cell exponential growth phase. The other factor evaluated was hydrogen partial pressure in the culture system. The substrate conversion efficiency increased from 86.07% to 95.56% along with the decrease of the total pressure in the photobioreactor from 1.082 × 10 5 to 0.944 × 10 5  Pa, which indicated that reduction of H 2 partial pressure by lowering the operating pressure substantially improved H 2 production in an anaerobic, photo-fermentation process.

  • Effects of Light/Dark Cycle, mixing pattern and partial pressure of H2 on biohydrogen production by Rhodobacter sphaeroides ZX-5.
    Bioresource technology, 2010
    Co-Authors: Yonghong Wang, Siliang Zhang, Ju Chu, Zhang Ming, Mingzhi Huang, Yingping Zhuang
    Abstract:

    The effects of Light/Dark Cycle, mixing pattern and partial pressure of H2 on the growth and hydrogen production of Rhodobacter sphaeroides ZX-5 were investigated. The results from Light/Dark Cycle culture showed that little or no hydrogen production was observed during the Dark periods, and the hydrogen production immediately recovered once illumination was resumed. Also, it was found that the optimum condition of shaking velocity was 120 rpm for hydrogen photo-fermentation. Meanwhile, shaking during H2 production phase (i.e., cell growth stationary phase) of photo-fermentation played a crucial role on effectively enhancing the phototrophic hydrogen production, rather than that during cell exponential growth phase. The other factor evaluated was hydrogen partial pressure in the culture system. The substrate conversion efficiency increased from 86.07% to 95.56% along with the decrease of the total pressure in the photobioreactor from 1.082×10(5) to 0.944×10(5) Pa, which indicated that reduction of H2 partial pressure by lowering the operating pressure substantially improved H2 production in an anaerobic, photo-fermentation process.

Dongda Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Synergising biomass growth kinetics and transport mechanisms to simulate Light/Dark Cycle effects on photo‐production systems
    Biotechnology and bioengineering, 2021
    Co-Authors: Bovinille Anye Cho, Miguel Ángel De Carvalho Servia, Ehecatl Antonio Del Rio Chanona, Robin Smith, Dongda Zhang
    Abstract:

    Light attenuation is a primary challenge limiting the upscaling of photobioreactors for sustainable bio-production. One key to this challenge, is to model and optimise the Light/Dark Cycles so that cells within the Dark region can be frequently transferred to the Light region for photosynthesis. Therefore, this study proposes the first mechanistic model to integrate the Light/Dark Cycle effects into biomass growth kinetics. This model was initially constructed through theoretical derivation based on the intracellular reaction kinetics, and was subsequently modified by embedding a new parameter, effective Light coefficient, to account for the effects of culture mixing. To generate in-silico process data, a new multiscale reactive transport modelling strategy was developed to couple fluid dynamics with biomass growth kinetics and Light transmission. By comparing against previous experimental and computational studies, the multiscale model shows to be of high accuracy. Based on its simulation result, an original correlation was proposed to link effective Light coefficient with photobioreactor gas inflow rate; this has not been done before. The impact of this study is that by using the proposed mechanistic model and correlation, we can easily control and optimise photobioreactor gas inflow rates to alleviate Light attenuation and maintain a high biomass growth rate. This article is protected by copyright. All rights reserved.

  • synergising biomass growth kinetics and transport mechanisms to simulate Light Dark Cycle effects on photo production systems
    Biotechnology and Bioengineering, 2021
    Co-Authors: Bovinille Anye Cho, Miguel Ángel De Carvalho Servia, Ehecatl Antonio Del Rio Chanona, Robin Smith, Dongda Zhang
    Abstract:

    Light attenuation is a primary challenge limiting the upscaling of photobioreactors for sustainable bio-production. One key to this challenge, is to model and optimise the Light/Dark Cycles so that cells within the Dark region can be frequently transferred to the Light region for photosynthesis. Therefore, this study proposes the first mechanistic model to integrate the Light/Dark Cycle effects into biomass growth kinetics. This model was initially constructed through theoretical derivation based on the intracellular reaction kinetics, and was subsequently modified by embedding a new parameter, effective Light coefficient, to account for the effects of culture mixing. To generate in-silico process data, a new multiscale reactive transport modelling strategy was developed to couple fluid dynamics with biomass growth kinetics and Light transmission. By comparing against previous experimental and computational studies, the multiscale model shows to be of high accuracy. Based on its simulation result, an original correlation was proposed to link effective Light coefficient with photobioreactor gas inflow rate; this has not been done before. The impact of this study is that by using the proposed mechanistic model and correlation, we can easily control and optimise photobioreactor gas inflow rates to alleviate Light attenuation and maintain a high biomass growth rate. This article is protected by copyright. All rights reserved.