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Lookup NU author(s): Dr Sharon Velasquez Orta,
Professor Adam Harvey,
Professor Maria Orta Ledesma
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This paper describes a process for producing biodiesel sustainably from microalgae grown on wastewater, whilst significantly reducing the wastewater’s nutrients and total coliform. Furthermore, ozone-flotation harvesting of the resultant biomass was investigated and shown to be viable, and to result in FAMEs of greater oxidation stability. Desmodesmus sp. and 2 mixed cultures were successfully grown on wastewater. Desmodesmus sp. grew more rapidly, to a higher maximum biomass concentration of 0.58 g/L. A native mixed culture dominated by Oscillatoria and Arthrospira, reached 0.45 g/L and exhibited the highest lipid and FAME yield. The FAME obtained from ozone-flotation exhibited greater oxidative stability, as the degree of saturation was higher. In principle ozone could therefore be used as a combined method of harvesting and reducing unsaturation. During microalgae treatment, the total nitrogen in the wastewater was reduced by 55.4 – 83.9%. More importantly, total coliform removal was as high as 99.8%.
Author(s): Oladapo K, Velasquez Orta SB, Monje-Ramirez I, Yáñez Noguez I, Harvey AP, Orta Ledesma MT
Publication type: Article
Publication status: Published
Journal: Bioresource Technology
Print publication date: 18/12/2013
ISSN (print): 0960-8524
ISSN (electronic): 1873-2976
Publisher: Elsevier BV
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