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Related Concept Videos

Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...

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Related Experiment Video

Updated: May 23, 2026

Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases
08:41

Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases

Published on: December 19, 2019

Continuous microalgae cultivation in a photobioreactor.

Haiying Tang1, Meng Chen, K Y Simon Ng

  • 1Department of Chemical Engineering and Materials Science, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202, USA.

Biotechnology and Bioengineering
|April 11, 2012
PubMed
Summary
This summary is machine-generated.

Optimizing dilution rates in continuous cultures significantly boosts microalgal biomass productivity for alternative fuels. Lipid content remained stable across tested dilution rates for Chlorella minutissima and Dunaliella tertiolecta.

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Algal Cultivation

Background:

  • Limited fossil fuel resources necessitate alternative fuel sources, with microalgae identified as promising non-food biomass feedstocks.
  • Commercial viability of microalgae for biofuels is hindered by suboptimal oil content, growth rates, and cultivation techniques.
  • Steady-state studies are crucial for understanding and optimizing algal growth parameters beyond batch studies.

Purpose of the Study:

  • To evaluate the impact of dilution rate on microalgal biomass productivity, lipid content, and fatty acid profiles.
  • To determine optimal steady-state conditions for two microalgae species under continuous illumination and CO2 supplementation.
  • To assess the feasibility of microalgae as a sustainable feedstock for alternative fuels.

Main Methods:

  • Continuous cultivation of microalgae (Chlorella minutissima and Dunaliella tertiolecta) for over three months.
  • Systematic variation of dilution rates to achieve steady-state conditions.
  • Monitoring of biomass productivity, lipid content, and fatty acid profiles at different dilution rates.

Main Results:

  • Biomass productivity for C. minutissima ranged from 39-137 mg/L/day, peaking at a dilution rate of 0.33 day(-1).
  • Biomass productivity for D. tertiolecta ranged from 46-91 mg/L/day, reaching maximum at a dilution rate of 0.42 day(-1).
  • Lipid content showed no significant variation across the tested dilution rates for both species.

Conclusions:

  • Dilution rate is a critical parameter for maximizing microalgal biomass productivity in continuous cultures.
  • Specific optimal dilution rates exist for different microalgae species to enhance biofuel feedstock production.
  • Further research into optimizing cultivation techniques can improve the economic viability of microalgae-based biofuels.