How it works
The culture circulates continuously through a network of transparent tubes (glass or plastic) arranged horizontally or vertically to capture light. A pump or aeration system maintains flow and mixing, while CO₂, pH and temperature are controlled. Being closed, it isolates the culture from the outside.
When it is used
It is used when high cell density, pure cultures and reproducible biomass are required: for example, in astaxanthin production with Haematococcus or for strains that require strict conditions. The large illuminated surface of the tubes favours good productivity.
Advantages
- +Large illuminated surface and high cell density
- +Pure, reproducible culture
- +Good control of conditions
Limitations
- −Higher investment and operating cost
- −Oxygen build-up in long tubes
- −Possible overheating; needs cooling
FAQ
Its large illuminated surface allows high cell densities and pure cultures, with good control of conditions.
Cost and oxygen build-up in long tubes, which can inhibit growth if not degassed.
Sources
- Richmond, A. & Hu, Q. (eds.) (2013). Handbook of Microalgal Culture: Applied Phycology and Biotechnology. Wiley-Blackwell.
- Chisti, Y. (2007). Biodiesel from microalgae. Biotechnology Advances, 25(3), 294–306.
- Spolaore, P. et al. (2006). Commercial applications of microalgae. Journal of Bioscience and Bioengineering, 101(2), 87–96.
- Mata, T.M. et al. (2010). Microalgae for biodiesel production and other applications: A review. Renewable and Sustainable Energy Reviews, 14(1), 217–232.
Scientific outreach based on specialised literature. Scientific review: pending.