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Growth performance and nutrient removal of a Chlorella vulgaris-Rhizobium sp. co-culture during mixotrophic feed-batch cultivation in synthetic wastewater
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0002-9481-8537
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2019 (English)In: Algal Research, ISSN 2211-9264, Vol. 44, article id UNSP 101690Article in journal (Refereed) Published
Abstract [en]

The subarctic green algal strain Chlorella vulgaris 13-1, newly isolated from Northern Sweden, and its co-occurring bacterium Rhizobium sp. were tested for their ability to produce valuable biomass and remove nutrients from synthetic wastewater during mixotrophic feed-batch cultivation at multiple hydraulic retention times (HRTs = 7, 5 and 3 days). The algal-bacterial co-culture showed better performance compared to the corresponding axenic cultures (HRT = 7 days), with a biomass concentration of 0.63 +/- 0.03 g/L and removal rates of 49.5 +/- 6.1% TOC, 55.7 +/- 8.04% TN and 95.6 +/- 3.6% TP at steady-state. Culture stability and a high nutrient removal capacity were recorded in the algal-bacterial co-culture even at HRTs of 5 and 3 days. Interestingly, reducing the HRT from 7 to 5 days resulted in a higher lipid content of the biomass, further reduction of the HRT to 3 days enhanced both daily biomass productivity (1.03 g/L/day) and nutrient assimilation. Mixotrophic co-cultivation of C. vulgaris-Rhizobium sp. can successfully be applied for wastewater reclamation in continuous mode at HRT of 3-7 days, and thus is suitable for both summer and winter conditions in Nordic countries.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 44, article id UNSP 101690
Keywords [en]
Algae, Bacteria, Co-culture, Symbiosis, Wastewater
National Category
Ecology Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-167077DOI: 10.1016/j.algal.2019.101690ISI: 000498792900031OAI: oai:DiVA.org:umu-167077DiVA, id: diva2:1383990
Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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Ferro, LorenzaGojkovic, ZivanFunk, Christiane

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