title: Effect of daytime CO2 supplement on productivity and biochemical composition of Scenedesmus armatus under outdoor cultivation.
abstract: The cultivation of Scenedesmus armatus was carried out under outdoor Thailand climate conditions. The highest actual growth rate occurred at around 9:00 a.m. to 3:00 p.m., with a wide pH range of 6.4 to 11. The supply of CO2 had slight influence on growth characteristics but did exert some observable effects on nutritional accumulations. Adding CO2 from 2 to 15% by volume in the aeration (0.2 vvm) caused an increase in lipid and protein from 19.8 to 25.6 and 37.8 to 48.2% w/w, respectively, whereas carbohydrate decreased from 42.5 to 26.2% w/w. Scenedesmus armatus cultivated with 2% CO2-enriched air provided the highest the average of the average biomass productivity of 91.25 mg L(-1) d(-1), which corresponded to a CO2 fixation of 165 mg CO2 L(-1) d(-1) with the average lipid, protein, and carbohydrate productivities of 22.24, 38.34, and 30.67 mg L(-1) d(-1).
authors.affiliation: a Chemical Engineering Research Unit for Value Adding of Bioresources, Department of Chemical Engineering , Faculty of Engineering, Chulalongkorn University , Bangkok , Thailand.
authors.forename: Watadta
authors.initials: W
authors.lastname: Ritcharoen
authors.affiliation: b National Center for Genetic Engineering and Biotechnology , National Science and Technology Development Agency , Phathum Thani , Thailand.
authors.forename: Sorawit
authors.initials: S
authors.lastname: Powtongsook
authors.affiliation: c PTT Research and Technology Institute , Phra Nakhon Si Ayutthaya , Thailand.
authors.forename: Kunn
authors.initials: K
authors.lastname: Kangvansaichol
authors.affiliation: a Chemical Engineering Research Unit for Value Adding of Bioresources, Department of Chemical Engineering , Faculty of Engineering, Chulalongkorn University , Bangkok , Thailand.
authors.forename: Prasert
authors.initials: P
authors.lastname: Pavasant
mesh_terms: D000383:Agriculture; D018533:Biomass; D002245:Carbon Dioxide / Q000008:administration & dosage*; D058433:Photobioreactors; D044444:Scenedesmus / Q000378:metabolism*
chemical_list: D002245:Carbon Dioxide
keywords: Carbon dioxide; growth rate; microalgae; nutrition; outdoor; photobioreactors