Porous membrane as a means of gas and nutrient exchange in a tubular photobioreactor
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In a tubular photobioreactor, a degassing column is often used for oxygen removal and carbon dioxide addition. The column may limit growth because the conditions are optimal only right after the degassing zone. In the present study, we tested continuous oxygen removal and nutrient delivery by placing a porous membrane tube inside a photobioreactor tube. The membrane tube would simultaneously remove dissolved oxygen and release nutrients and carbon dioxide to the photobioreactor tube. We tested oxygen as a model of gas exchange; nitrate and ammonium were tested as models of macronutrients and copper as a model of micronutrients. Oxygen-poor or nutrient-rich water was flowed in a dialysis tube placed inside a glass tube containing originally air-saturated water. In 60 min, the concentration of oxygen decreased by 48 % of the initial value and the nutrients reached 55–90 % of the feed flow concentration. The results suggest that integrating a porous membrane tube into the tubular photobioreactor tube can improve oxygen removal and nutrient delivery.
KeywordsTubular photobioreactor Porous membrane Diffusion Oxygen Nutrients
This study was funded by the European Regional Development Fund (Bio Refine Tech project coordinated by Cursor Oy). ET was also supported by Academy of Finland. The authors are responsible for study design and collection and interpretation of the data.
- Dor I (1977) Process for promotion of algae growth in a sewage medium. US Patent 40443903AGoogle Scholar
- Lide DR (ed) (2000) CRC Handbook of Chemistry and Physics, 81st edition 2000–2001. CRC, Boca RatonGoogle Scholar
- Redfield AC (1934) On the proportions of organic derivations in sea water and their relation to the composition of plankton. In: Daniel RJ (ed) James Johnstone memorial volume. University Press of Liverpool, Liverpool, pp 177–192Google Scholar
- Seader JD, Henley EJ (2006) Separation process principles, 2nd edn. Wiley, New York, p 68Google Scholar