A1 Refereed original research article in a scientific journal
Cultivation of Nannochloropsis for eicosapentaenoic acid production in wastewaters of pulp and paper industry
Authors: Anna Polishchuk, Dimitar Valev, Marko Tarvainen, Sujata Mishra, Viljami Kinnunen, Taras Antal, Baoru Yang, Jukka Rintala, Esa Tyystjärvi
Publication year: 2015
Journal: Bioresource Technology
Volume: 193
First page : 469
Last page: 476
Number of pages: 8
ISSN: 0960-8524
DOI: https://doi.org/10.1016/j.biortech.2015.06.135
Abstract
The eicosapentaenoic acid (EPA) containing marine microalga Nannochloropsis oculata was grown in an
effluent from anaerobic digestion of excess activated sludge from a wastewater treatment plant serving
a combination of a pulp and a paper mill and a municipality (digester effluent, DE), mixed with the effluent
of the same wastewater treatment plant. The maximum specific growth rate and photosynthesis of N.
oculata were similar in the DE medium and in artificial sea water medium (ASW) but after 7 days, algae
grown in the DE medium contained seven times more triacylglycerols (TAGs) per cell than cells grown in
ASW, indicating mild stress in the DE medium. However, the volumetric rate of EPA production was similar
in the ASW and DE media. The results suggest that N. oculata could be used to produce EPA, utilizing
the nutrients available after anaerobic digestion of excess activated sludge of a pulp and paper mill.
The eicosapentaenoic acid (EPA) containing marine microalga Nannochloropsis oculata was grown in an
effluent from anaerobic digestion of excess activated sludge from a wastewater treatment plant serving
a combination of a pulp and a paper mill and a municipality (digester effluent, DE), mixed with the effluent
of the same wastewater treatment plant. The maximum specific growth rate and photosynthesis of N.
oculata were similar in the DE medium and in artificial sea water medium (ASW) but after 7 days, algae
grown in the DE medium contained seven times more triacylglycerols (TAGs) per cell than cells grown in
ASW, indicating mild stress in the DE medium. However, the volumetric rate of EPA production was similar
in the ASW and DE media. The results suggest that N. oculata could be used to produce EPA, utilizing
the nutrients available after anaerobic digestion of excess activated sludge of a pulp and paper mill.
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