Extraction of lipids from microalgae using fluidisation

Microalgae are promising sources of lipids and are widely being investigated today for their capacity as a starting material for biodiesel production. One of the major constraints in handling algae and extracting lipids in large scale is the dewatering/drying step and the overall cost it incurs. Thi...

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Main Author: Visawa Janani Vidya Sankar
Other Authors: Lau Wai Man
Format: Theses and Dissertations
Language:English
Published: 2013
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Online Access:http://hdl.handle.net/10356/54345
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-543452023-03-03T16:05:32Z Extraction of lipids from microalgae using fluidisation Visawa Janani Vidya Sankar Lau Wai Man School of Chemical and Biomedical Engineering DRNTU::Engineering::Bioengineering Microalgae are promising sources of lipids and are widely being investigated today for their capacity as a starting material for biodiesel production. One of the major constraints in handling algae and extracting lipids in large scale is the dewatering/drying step and the overall cost it incurs. This study proposes fluidisation as a new method for extracting lipids in the presence of water. The algal cells were exposed to different bubbling conditions; assisted with and without solids. The effects of the bubbles on cells and thus lipid extraction from the wet biomass were measured in terms of the amount of fatty acids obtained after trans-esterification determined using gas chromatography. The results were supported by scanning electron microscopic images which showed the morphological changes due to the hydrodynamic stress offered by the bubbles on the cells and on the introduction of solids. The results indicated that bubbling at higher velocities, 25cm/s has a positive effect towards lipid extraction in the presence of water, than operating at lower velocities. With the solids involved, cell disruption was clearly seen at relatively higher velocities; and short time exposure to fluidisation at that velocity was found to be effective in terms of lipid extraction. ​Master of Science (Biomedical Engineering) 2013-06-19T04:37:04Z 2013-06-19T04:37:04Z 2013 2013 Thesis http://hdl.handle.net/10356/54345 en 54 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Bioengineering
spellingShingle DRNTU::Engineering::Bioengineering
Visawa Janani Vidya Sankar
Extraction of lipids from microalgae using fluidisation
description Microalgae are promising sources of lipids and are widely being investigated today for their capacity as a starting material for biodiesel production. One of the major constraints in handling algae and extracting lipids in large scale is the dewatering/drying step and the overall cost it incurs. This study proposes fluidisation as a new method for extracting lipids in the presence of water. The algal cells were exposed to different bubbling conditions; assisted with and without solids. The effects of the bubbles on cells and thus lipid extraction from the wet biomass were measured in terms of the amount of fatty acids obtained after trans-esterification determined using gas chromatography. The results were supported by scanning electron microscopic images which showed the morphological changes due to the hydrodynamic stress offered by the bubbles on the cells and on the introduction of solids. The results indicated that bubbling at higher velocities, 25cm/s has a positive effect towards lipid extraction in the presence of water, than operating at lower velocities. With the solids involved, cell disruption was clearly seen at relatively higher velocities; and short time exposure to fluidisation at that velocity was found to be effective in terms of lipid extraction.
author2 Lau Wai Man
author_facet Lau Wai Man
Visawa Janani Vidya Sankar
format Theses and Dissertations
author Visawa Janani Vidya Sankar
author_sort Visawa Janani Vidya Sankar
title Extraction of lipids from microalgae using fluidisation
title_short Extraction of lipids from microalgae using fluidisation
title_full Extraction of lipids from microalgae using fluidisation
title_fullStr Extraction of lipids from microalgae using fluidisation
title_full_unstemmed Extraction of lipids from microalgae using fluidisation
title_sort extraction of lipids from microalgae using fluidisation
publishDate 2013
url http://hdl.handle.net/10356/54345
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