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Energies 2014, 7(7), 4417-4429; https://doi.org/10.3390/en7074417

Microalgae Harvest through Fungal Pelletization—Co-Culture of Chlorella vulgaris and Aspergillus niger

Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave, MN 55108, USA
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Received: 6 June 2014 / Revised: 3 July 2014 / Accepted: 4 July 2014 / Published: 10 July 2014
(This article belongs to the Special Issue Algae Based Technologies)
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Abstract

Microalgae harvesting is a labor- and energy-intensive process and new approaches to harvesting microalgae need to be developed in order to decrease the costs. In this study; co-cultivatation of filamentous fungus (Aspergillus niger) and microalgae (Chlorella vulgaris) to form cell pellets was evaluated under different conditions, including organic carbon source (glucose; glycerol; and sodium acetate) concentration; initial concentration of fungal spores and microalgal cells and light. Results showed that 2 g/L of glucose with a 1:300 ratio of fungi to microalgae provided the best culturing conditions for the process to reach >90% of cell harvest efficiency. The results also showed that an organic carbon source was required to sustain the growth of fungi and form the cell pellets. The microalgae/fungi co-cultures at mixotrophic conditions obtained much higher total biomass than pure cultures of each individual strains; indicating the symbiotic relationship between two strains. This can benefit the microbial biofuel production in terms of cell harvest and biomass production. View Full-Text
Keywords: co-culture; filamentous fungi; microalgae harvest; pelletization co-culture; filamentous fungi; microalgae harvest; pelletization
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Gultom, S.O.; Zamalloa, C.; Hu, B. Microalgae Harvest through Fungal Pelletization—Co-Culture of Chlorella vulgaris and Aspergillus niger. Energies 2014, 7, 4417-4429.

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