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Questions and Answers
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 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?
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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?
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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?
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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?
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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?
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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?
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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.
