Pawar, Sanjay and Gupta, Suvidha (2016) Effect of hydrodynamics, light and nitrogen stresses on biomass growth and lipid productivity in an airlift reactor. In: The 9th Asia Pacific Conference on Algal Biotechnology, Algae for food, feed, fuel and beyond, 14 -18 November, 2016, Bangkok, Thailand.

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Abstract

The quality of biodiesel strongly depends on the proportion of saturated and unsaturated fatty acids in lipids. Thus, various process parameters and strategies which affect the lipid's composition are also studied in this article. Microalgae sp. Scenedesmus abundance was grown in two identical airlift photobioreactors (PBRs) equipped with red and white light LEDs of 10 L capacity. The effects of hydrodynamics stress (by manipulating the gas velocity) and nitrogen stress (nitrate concentration) have been studying on the biomass growth and lipid productivity. It has been found that the algae cells growth in the airlift PBR equipped with red LEDs were higher than that obtained in the PBR with white LEDs. The total lipids (dry wt. basis) of microalgae sp. were 12% (±2.4) and 17% (±1.9) for white-LED-PBR and red-LED-PBR respectively for nitrate replete media. Whereas, it was obtained 18% (±1.8) and 23% (±2.5) in the case of nitrate deplete media for white-LED-PBR and red-LED-PBR respectively. The lipid profiling in the case of nitrate deplete condition showed that the SFA, MUFA and PUFA contents were obtained in the range of 28-30%, 35-53% and 10-31% respectively with CN values ranging between 51-53 which are suitable characteristics for biodiesel production.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Environmental Biotechnology Chemistry, Chemical Technology Energy Sources
Divisions:	UNSPECIFIED
Depositing User:	Dr Sanjay Pawar
Date Deposited:	07 Mar 2017 11:44
Last Modified:	07 Mar 2017 11:44
URI:	http://neeri.csircentral.net/id/eprint/728

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