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Questions and Answers
What is the main advantage of vertical-column photobioreactors?
What is the main advantage of vertical-column photobioreactors?
What is the approximate doubling time of Chlorella sp. during the exponential phase?
What is the approximate doubling time of Chlorella sp. during the exponential phase?
What is the purpose of the plastic tubes with a diameter of 6mm in the bubble-column photobioreactor?
What is the purpose of the plastic tubes with a diameter of 6mm in the bubble-column photobioreactor?
What is a characteristic feature of the bubble-column photobioreactor used for Chlorella sp. cultivation?
What is a characteristic feature of the bubble-column photobioreactor used for Chlorella sp. cultivation?
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What contributes to the intermixing between the riser and the downcomer zones in a draft tube photobioreactor?
What contributes to the intermixing between the riser and the downcomer zones in a draft tube photobioreactor?
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What was the conclusion drawn from the study comparing bubble column and airlift bioreactors for the culture of Phaeodactylum tricornutum?
What was the conclusion drawn from the study comparing bubble column and airlift bioreactors for the culture of Phaeodactylum tricornutum?
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What effect did the increase of light intensity have on the accumulation of astaxanthin in the study?
What effect did the increase of light intensity have on the accumulation of astaxanthin in the study?
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What is the main reason for the compatibility of the large-diameter vertical reactors with the biomass?
What is the main reason for the compatibility of the large-diameter vertical reactors with the biomass?
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What is the sensitivity of carotenoids contents in P. tricornutum to available light in light-limited culture compared to chlorophyll contents?
What is the sensitivity of carotenoids contents in P. tricornutum to available light in light-limited culture compared to chlorophyll contents?
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What is a notable impact of regular light/dark cycles and laminar flow on the cultivation process in the study?
What is a notable impact of regular light/dark cycles and laminar flow on the cultivation process in the study?
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What is a major challenge in the scale-up of photobioreactors?
What is a major challenge in the scale-up of photobioreactors?
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What method has been reported for light distribution in scale-up photobioreactors, despite being expensive and presenting technical problems?
What method has been reported for light distribution in scale-up photobioreactors, despite being expensive and presenting technical problems?
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According to Ogbonna et al (1996), what is required for the success of scale-up in photobioreactors?
According to Ogbonna et al (1996), what is required for the success of scale-up in photobioreactors?
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Study Notes
Photobioreactors Advantages and Characteristics
- Vertical-column photobioreactors have a higher surface area-to-volume ratio, resulting in higher biomass productivity.
Chlorella sp. Growth
- The approximate doubling time of Chlorella sp. during the exponential phase is not specified.
Bubble-Column Photobioreactor Components
- Plastic tubes with a diameter of 6mm in the bubble-column photobioreactor are used for sparging, which introduces air and CO2 into the culture.
Bubble-Column Photobioreactor Characteristics
- A characteristic feature of the bubble-column photobioreactor used for Chlorella sp. cultivation is the presence of a bubble column.
Draft Tube Photobioreactor Function
- The intermixing between the riser and the downcomer zones in a draft tube photobioreactor is contributed to by the circulation of the culture broth.
Comparison of Bioreactors
- The study comparing bubble column and airlift bioreactors for the culture of Phaeodactylum tricornutum concluded that both bioreactors can be used for the cultivation of the microalga.
Astaxanthin Accumulation
- The increase of light intensity had a positive effect on the accumulation of astaxanthin in the study.
Large-Diameter Vertical Reactors
- The main reason for the compatibility of the large-diameter vertical reactors with the biomass is their ability to provide a high surface area-to-volume ratio.
Carotenoids and Chlorophyll Sensitivity
- The sensitivity of carotenoids contents in P.tricornutum to available light in light-limited culture is higher compared to chlorophyll contents.
Light/Dark Cycles and Laminar Flow
- Regular light/dark cycles and laminar flow have a notable impact on the cultivation process in the study, promoting cell growth and productivity.
Scale-Up Challenges
- A major challenge in the scale-up of photobioreactors is the maintenance of a uniform light distribution.
Scale-Up Methods
- The method of using optical fibers for light distribution in scale-up photobioreactors has been reported, despite being expensive and presenting technical problems.
Scale-Up Success
- According to Ogbonna et al (1996), the success of scale-up in photobioreactors requires sufficient light distribution and mixing.
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Description
Learn about the compact, low-cost, and easy to operate vertical-column photobioreactors that are promising for large-scale cultivation of biomass algae. Understand the potential biomass concentration and growth rate attainable in bubble-column and airlift photobioreactors.
