Isolation and characterization of microalgal strains for biomass production and wastewater reclamation in Northern Sweden

Abstract

Microalgal strains adapted to the harsh Nordic climate were isolated from Swedish fresh- and wastewater sources and tested for their ability to grow in municipal wastewater. The 62 strains able to grow in municipal wastewater belonged to 12 different genera, of those Desmodesmus, Scenedesmus and Chlorella were most representative. Eight axenic strains were further characterized, all of which could efficiently remove nitrogen (> 90%) and phosphate (> 99%) from the wastewater in less than two weeks. The microalga Coelastrella sp. had the highest performance in terms of both biomass concentration and total lipid content (1.46 g/L, 30.8%) after 13 days of cultivation. This is the first report of a Coelastrella strain isolated in Sweden. Even Chlorella vulgaris performed very well with a biomass concentration and total lipid content of 1.15 g/L and 34.2%, respectively. Finally, two Desmodesmus sp. strains showed desirable traits for biofuel-feedstock, due to their fast growth rates (1.18 and 1.08 d(-1)) together with high oil content (29.8% and 36.7% of DW).

Keywords

Microalgae; Northern Sweden; Municipal wastewater; Biomass production; Nitrogen; Phosphate

Published in

Algal Research
2018, Volume: 32, pages: 44-53
Publisher: ELSEVIER SCIENCE BV

SLU Authors

• Gentili, Francesco

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

SDG6 Clean water and sanitation


UKÄ Subject classification

Bioenergy
Microbiology


Publication identifier

DOI: https://doi.org/10.1016/j.algal.2018.03.006

Permanent link to this page (URI)

https://res.slu.se/id/publ/95945