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Algal Growth

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Erick Ringot – One of the best experts on this subject based on the ideXlab platform.

Thomas Martinez – One of the best experts on this subject based on the ideXlab platform.

  • Algal Growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination
    International Biodeterioration & Biodegradation, 2014
    Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick Ringot
    Abstract:

    Abstract Building materials are regularly affected by the Growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such Growth: photocatalytic coatings and water repellent treatments. The efficiency of these treatments in terms of biological Growth inhibition was tested on the algae species Graesiella emersonii. Algal Growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with photocatalytic coating or with water repellent were studied. The Algal Growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological Growth kinetics could be attributed to photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, Algal Growth slowed significantly under water run-off and even stopped under water capillary ascent.

  • Algal Growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination
    International Biodeterioration and Biodegradation, 2014
    Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick Ringot
    Abstract:

    Building materials are regularly affected by the Growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such Growth: photocatalytic coatings and water repellent treatments. The efficiency of these treatments in terms of biological Growth inhibition was tested on the algae species Graesiella emersonii. Algal Growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with photocatalytic coating or with water repellent were studied. The Algal Growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological Growth kinetics could be attributed to photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, Algal Growth slowed significantly under water run-off and even stopped under water capillary ascent. (C) 2014 Elsevier Ltd. All rights reserved.

David T. Hanson – One of the best experts on this subject based on the ideXlab platform.

  • simulating ph effects in an Algal Growth hydrodynamics model1
    Journal of Phycology, 2013
    Co-Authors: Scott C. James, Vijayasarathi Janardhanam, David T. Hanson
    Abstract:

    Models and numerical simulations are relatively inexpensive tools that can be used to enhance economic competitiveness through operation and system optimization to minimize energy and resource consumption, while maximizing Algal oil yield. This work uses modified versions of the U.S. Environmental Protection Agency‘s Environmental Fluid Dynamics Code (EFDC) in conjunction with the U.S. Army Corp of Engineers’ water-quality code (CE-QUAL) to simulate flow hydrodynamics coupled to Algal Growth kinetics. The model allows the flexibility of manipulating a host of variables associated with Algal Growth such as temperature, light intensity, and nutrient availability. pH of the medium is a newly added operational parameter governing Algal Growth that affects Algal photosynthesis, differential availability of inorganic forms of carbon, enzyme activity in algae cell walls, and oil production rates. A single-layer AlgalGrowth/hydrodynamic model without pH limitation was verified by comparing solution curves of Algal biomass and phosphorus concentrations to an analytical solution. Media pH, now included in the model as a Growth-limiting factor, can be entered as a measured value or calculated based on CO2 concentrations. Upon adding the ability to limit Growth due to pH, physically reasonable results have been obtained from the model both with and without pH limitation. When the model was used to simulate Algal Growth from a pond experiment in the greenhouse, a least-squares fitting technique yielded a maximum Algal production (subsequently modulated by limitation factors) of 1.05 d(-1) . Overall, the measured and simulated biomass concentrations in the greenhouse pond were in close agreement.

  • Simulating pH effects in an AlgalGrowth hydrodynamics model1
    Journal of phycology, 2013
    Co-Authors: Scott C. James, Vijayasarathi Janardhanam, David T. Hanson
    Abstract:

    Models and numerical simulations are relatively inexpensive tools that can be used to enhance economic competitiveness through operation and system optimization to minimize energy and resource consumption, while maximizing Algal oil yield. This work uses modified versions of the U.S. Environmental Protection Agency‘s Environmental Fluid Dynamics Code (EFDC) in conjunction with the U.S. Army Corp of Engineers’ water-quality code (CE-QUAL) to simulate flow hydrodynamics coupled to Algal Growth kinetics. The model allows the flexibility of manipulating a host of variables associated with Algal Growth such as temperature, light intensity, and nutrient availability. pH of the medium is a newly added operational parameter governing Algal Growth that affects Algal photosynthesis, differential availability of inorganic forms of carbon, enzyme activity in algae cell walls, and oil production rates. A single-layer AlgalGrowth/hydrodynamic model without pH limitation was verified by comparing solution curves of Algal biomass and phosphorus concentrations to an analytical solution. Media pH, now included in the model as a Growth-limiting factor, can be entered as a measured value or calculated based on CO2 concentrations. Upon adding the ability to limit Growth due to pH, physically reasonable results have been obtained from the model both with and without pH limitation. When the model was used to simulate Algal Growth from a pond experiment in the greenhouse, a least-squares fitting technique yielded a maximum Algal production (subsequently modulated by limitation factors) of 1.05 d(-1) . Overall, the measured and simulated biomass concentrations in the greenhouse pond were in close agreement.

Scott C. James – One of the best experts on this subject based on the ideXlab platform.

  • simulating ph effects in an Algal Growth hydrodynamics model1
    Journal of Phycology, 2013
    Co-Authors: Scott C. James, Vijayasarathi Janardhanam, David T. Hanson
    Abstract:

    Models and numerical simulations are relatively inexpensive tools that can be used to enhance economic competitiveness through operation and system optimization to minimize energy and resource consumption, while maximizing Algal oil yield. This work uses modified versions of the U.S. Environmental Protection Agency’s Environmental Fluid Dynamics Code (EFDC) in conjunction with the U.S. Army Corp of Engineers’ water-quality code (CE-QUAL) to simulate flow hydrodynamics coupled to Algal Growth kinetics. The model allows the flexibility of manipulating a host of variables associated with Algal Growth such as temperature, light intensity, and nutrient availability. pH of the medium is a newly added operational parameter governing Algal Growth that affects Algal photosynthesis, differential availability of inorganic forms of carbon, enzyme activity in algae cell walls, and oil production rates. A single-layer AlgalGrowth/hydrodynamic model without pH limitation was verified by comparing solution curves of Algal biomass and phosphorus concentrations to an analytical solution. Media pH, now included in the model as a Growth-limiting factor, can be entered as a measured value or calculated based on CO2 concentrations. Upon adding the ability to limit Growth due to pH, physically reasonable results have been obtained from the model both with and without pH limitation. When the model was used to simulate Algal Growth from a pond experiment in the greenhouse, a least-squares fitting technique yielded a maximum Algal production (subsequently modulated by limitation factors) of 1.05 d(-1) . Overall, the measured and simulated biomass concentrations in the greenhouse pond were in close agreement.

  • Simulating pH effects in an AlgalGrowth hydrodynamics model1
    Journal of phycology, 2013
    Co-Authors: Scott C. James, Vijayasarathi Janardhanam, David T. Hanson
    Abstract:

    Models and numerical simulations are relatively inexpensive tools that can be used to enhance economic competitiveness through operation and system optimization to minimize energy and resource consumption, while maximizing Algal oil yield. This work uses modified versions of the U.S. Environmental Protection Agency’s Environmental Fluid Dynamics Code (EFDC) in conjunction with the U.S. Army Corp of Engineers’ water-quality code (CE-QUAL) to simulate flow hydrodynamics coupled to Algal Growth kinetics. The model allows the flexibility of manipulating a host of variables associated with Algal Growth such as temperature, light intensity, and nutrient availability. pH of the medium is a newly added operational parameter governing Algal Growth that affects Algal photosynthesis, differential availability of inorganic forms of carbon, enzyme activity in algae cell walls, and oil production rates. A single-layer AlgalGrowth/hydrodynamic model without pH limitation was verified by comparing solution curves of Algal biomass and phosphorus concentrations to an analytical solution. Media pH, now included in the model as a Growth-limiting factor, can be entered as a measured value or calculated based on CO2 concentrations. Upon adding the ability to limit Growth due to pH, physically reasonable results have been obtained from the model both with and without pH limitation. When the model was used to simulate Algal Growth from a pond experiment in the greenhouse, a least-squares fitting technique yielded a maximum Algal production (subsequently modulated by limitation factors) of 1.05 d(-1) . Overall, the measured and simulated biomass concentrations in the greenhouse pond were in close agreement.

Gilles Escadeillas – One of the best experts on this subject based on the ideXlab platform.

  • Algal Growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination
    International Biodeterioration & Biodegradation, 2014
    Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick Ringot
    Abstract:

    Abstract Building materials are regularly affected by the Growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such Growth: photocatalytic coatings and water repellent treatments. The efficiency of these treatments in terms of biological Growth inhibition was tested on the algae species Graesiella emersonii. Algal Growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with photocatalytic coating or with water repellent were studied. The Algal Growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological Growth kinetics could be attributed to photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, Algal Growth slowed significantly under water run-off and even stopped under water capillary ascent.

  • Algal Growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination
    International Biodeterioration and Biodegradation, 2014
    Co-Authors: Thomas Martinez, Alexandra Bertron, Gilles Escadeillas, Erick Ringot
    Abstract:

    Building materials are regularly affected by the Growth of microalgae. The consequences are mainly aesthetic but the colonization can cause biodeterioration of the material in the most extreme cases. This study investigates two building material treatments that can potentially inhibit or slow down such Growth: photocatalytic coatings and water repellent treatments. The efficiency of these treatments in terms of biological Growth inhibition was tested on the algae species Graesiella emersonii. Algal Growth on building materials was investigated using two accelerated tests simulating different types of humidification (water capillary ascent and water run-off) under different lighting conditions. Mortars treated with photocatalytic coating or with water repellent were studied. The Algal Growth on the mortar surface was evaluated using image analysis (area covered and intensity of fouling). No slow down of the biological Growth kinetics could be attributed to photocatalytic substrates. However, for mortars impregnated with a water-repellent preparation, Algal Growth slowed significantly under water run-off and even stopped under water capillary ascent. (C) 2014 Elsevier Ltd. All rights reserved.