title: Effect of dynamic oxygen concentrations on the growth of Neochloris oleoabundans at sub-saturating light conditions.
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.
authors.affiliation: Wetsus, P.O. Box 1113, 8900 CC Leeuwarden, The Netherlands. claudia.sousa@wetsus.nl
authors.forename: Claudia
authors.initials: C
authors.lastname: Sousa
authors.forename: Dimitar
authors.initials: D
authors.lastname: Valev
authors.forename: Marian H
authors.initials: MH
authors.lastname: Vermuë
authors.forename: Rene H
authors.initials: RH
authors.lastname: Wijffels
mesh_terms: D018533:Biomass; D019149:Bioreactors; D002338:Carotenoids / Q000032:analysis; D002734:Chlorophyll / Q000032:analysis; D000460:Chlorophyta / Q000737:chemistry / Q000254:growth & development*; D003470:Culture Media; D008027:Light; D010100:Oxygen / Q000032:analysis*; D055668:Photochemical Processes
chemical_list: D003470:Culture Media; D002734:Chlorophyll; D002338:Carotenoids; D010100:Oxygen
keywords: Dynamic oxygen; Light regime; Neochloris oleoabundans; Tubular photobioreactors