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Olsson, Niklas, 2015. The mechanism of microalgal adhesion to fungal pellets and its applications. Second cycle, A1E. Alnarp: SLU, Dept. of Biosystems and Technology (from 130101)



This work is concerned with the use of fungi to harvest microalgae. The ability of Aspergillus niger and
Trichoderma harzianum to harvest cells of Chlorella vulgaris and Scenedesmus ssp. was assessed in several
experiments designed to elucidate the adhesion mechanism. While A. niger was able to form co-pellets
with both C. vulgaris and Scenedesmus ssp. by addition of spores to the algal culture, T. harzianum
only produced filamentous mats. When KCl was added to the medium, the supernatant of the co-culture
with A. niger and C. vulgaris was opaque compared to the clear supernatant of the co-culture without
KCl. This implies that the adhesion of microalgal cells to the fungal hyphae is influenced by electrostatic
interactions. Cells of C. vulgaris adhered to the surface of pre-made pellets of both fungal species but
the pellets A. niger collected more cells than those of T. harzianum. The capability of fungi to harvest
microalgae can be an important aspect of the transition to a biobased society as microalgae is seen as a
promising renewable source of both oil and fermentables for the bioenergy industries.

Main title:The mechanism of microalgal adhesion to fungal pellets and its applications
Authors:Olsson, Niklas
Supervisor:Hultberg, Malin and Bodin, Hristina
Examiner:Asp, Håkan
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2015
Level and depth descriptor:Second cycle, A1E
Student's programme affiliation:LY003 Horticultural Science Programme 300 HEC
Supervising department:(LTJ, LTV) > Dept. of Biosystems and Technology (from 130101)
Keywords:C. vulgaris, biopellets, T. harzianum, A. niger, Scenedesmus, XDLVO theory, microalgal harvesting
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Subject. Use of subject categories until 2023-04-30.:Plant physiology and biochemistry
Life sciences
Additional Information:Ämne: Biologi
Deposited On:08 Dec 2015 15:21
Metadata Last Modified:09 Dec 2015 05:00

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