Comparison between Airlift Photobioreactor and Bubble Column for Skeletonema Costatum Cultivation

Authors

  • Saranya Monkonsit Chulalongkorn University
  • Sorawit Powtongsook Chulalongkorn University
  • Prasert Pavasant Chulalongkorn University

DOI:

https://doi.org/10.4186/ej.2011.15.4.53

Keywords:

Diatom, microalgae, cultivation, bioreactor, aquaculture.

Abstract

The cultivation of diatom Skeletonema costatum was achieved in airlift photobioreactor and the system performance was compared to that of bubble column. The standard F/2 medium (Guillard’s medium) for typical diatom cultivation could only yield the best growth character when the silicon concentration increased 4 times the normal value. In terms of cell growth, the airlift photobioreactor provided better performance than the bubble column where the maximum cell concentration, specific growth rate, and productivity in the airlift were 4.6 x 106 cell mL-1, 0.07 h-1, and 6.4 x 104 cell s-1 compared with 1.8 x 106 cell mL-1, 0.04 h-1, and 2.2 x 104 cell s-1 in the bubble column of the same size (3L) and operated at the same aeration rate (superficial velocity = 1.5 cm s-1) and light intensity (34 μmol photons m−2 s−1). This was because the airlift photobioreactor allowed circulatory flow in the system which helps prevent cell precipitation and enhance light utilization efficiency. The optimal operating conditions in the airlift system which was found most optimal to cell growth were: the ratio between downcomer and riser cross sectional area (Ad:Ar) of 3.27, superficial gas velocity 1.5 cm s−1 and the light intensity 34 μmol photons m−2 s−1. Preliminary economical assessment on the cultivation of S. costatum in airlift system compared with that in bubble column was carried out, whereas the analysis for nutritional values of the obtained biomass indicated relatively high protein content.

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Author Biographies

Saranya Monkonsit

Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Sorawit Powtongsook

Center of Excellence for Marine Biotechnology, Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand

National Center of Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani 12120, Thailand

Prasert Pavasant

Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published

Vol 15 No 4, Sep 3, 2011

How to Cite

[1]
S. Monkonsit, S. Powtongsook, and P. Pavasant, “Comparison between Airlift Photobioreactor and Bubble Column for Skeletonema Costatum Cultivation”, Eng. J., vol. 15, no. 4, pp. 53-64, Sep. 2011.

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