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IJSTR >> Volume 7 - Issue 1, January 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Impact Of Different Nitrogen Concentrations On Biomass Productivity, Lipid Content And Target Fatty Acids Within Chlorella Sp. And Desmodesmus Quadricaudatus To Enhance Biodiesel Production

[Full Text]



Marwa G. Saad, Hesham M. Shafik, Laila Mekki, Radwa El-Kholy



Biodiesel, Biomass productivity, Microalgae, Nitrate, Target Fatty Acids, Abbreviations: TFAs; Target Fatty Acids, CN; Cetane Number, SV; Saponification Value, DCW; Dry Cell Weight, CFPP; Cold filter plugging point, Gas Chromatography; GC.



At constant time and temperature, pure cultures of Chlorella sp. and Desmodesmus quadriquadatus studied under different nitrate concentrations of 375, 186, 94, 47, 23 and 0.0 mgl-1 to enhance biodiesel production. Nitrate reduced gradually from concentration to another each 7-day cultures. Biomass for all cultures estimated as chlorophyll-a (µgl-1) and dry cell weight (gl-1). For all 7 days` cultures, biomass productivity (mgl-1d-1), lipid content (% biomass) and target fatty acids (%TFAs) for biodiesel production were detected. Because biodiesel quality and quantity affected by growth and lipid content; nitrate concentrations of 23 and 375 mgl-1 were suitable to cultivate Chlorella and D. quadricaudatus for production of biodiesel where Chlorella results` were; biomass productivity; 263mgl-1, lipid content; 87.49%DCW and TFAs; 42.71% while at 375 mgl-1 NaNO3 D. quadricaudatus results` were; biomass productivity; 290.3mgl-1, lipid content; 57.98%DCW and TFAs; 65.39%. Biodiesel samples produced from both species accepted for both ASTM and EN standards. In this paper, the highest percent in lipid content and biomass productivity for Chlorella sp. and Desmodesmus quadricaudatus comparing with other literature recorded. In addition, this paper considered the time as an agent for biodiesel production, that no other paper had considered.



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