Effect of dynamic oxygen concentrations on the growth of Neochloris oleoabundans at sub-saturating light conditions

C.A. Sousa, D. Valev, M.H. Vermue, R.H. Wijffels

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

In tubular photobioreactors micro-algae continuously experience dynamically changing oxygen and light conditions when circulating from the solar receiver to the dark degasser. These changes in oxygen concentration and light were simulated in a CSTR using sub-saturating light intensity. Elongation of the residence time in the solar receiver from 30 to 300 min was also investigated. Specific growth rates measured at constant low oxygen concentration PO2 = 0.21 bar were; 1.14 ± 0.06 day 1 using continuous light 0.80 ± 0.16 day 1 with 30 min light and 1.09 ± 0.05 day 1 with 300 min light. The effect of dynamically changing oxygen concentrations from PO2 = 0.21 to 0.63 bar followed by degassing resulted in similar specific growth rates. The exposure of the algae cells to dark periods in the degasser has a bigger negative impact than the temporary exposure to accumulating oxygen concentrations in the solar receiver. This shows that considerable energy savings for degassing are possible.
Original languageEnglish
Pages (from-to)95-100
JournalBioresource Technology
Volume142
DOIs
Publication statusPublished - 2013

Keywords

  • chlamydomonas-reinhardtii
  • tubular photobioreactor
  • microalgae
  • design
  • accumulation
  • performance
  • metabolism
  • mechanisms
  • biomass
  • algae

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