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- Title
Influence of Dissolved Inorganic Carbon and Nitrogen Sources on Growth, Total Lipid Content and Calorific Value of the Freshwater Oleaginous Microalgae Ankistrodesmus falcatus (Corda) Ralfs.
- Authors
Talukdar, Jayanta; Kalita, Mohan Chandra; Goswami, Bhabesh Chandra
- Abstract
Biofuel potentiality of a native strain of freshwater oleaginous microalgae A.falcatus was studied owing to its inherently high lipid content. The influence of media constituents, pH and nitrogen sources on growth (µ), total lipid (TL) content and calorific value (CV) was compared in the batch culture. The bold basal medium was superior (µ = 0.498 d-1, TL = 43.4% and CV = 23.4 kJg-1) to BG11 (µ = 0.385 d-1, TL = 38.2% and CV = 19.2 kJg-1). Initial culture pH < 7.0 and > 9.0 significantly affected the growth of microalgae. Medium pH (~ 7.0) and NaHCO3 (30 mgL-1), were found suitable for the optimum growth at the light intensity of 35 µ mol photons m-2s-1, the temperature of 25 ± 2 °C and the photoperiod of 16:8 h light and dark diurnal cycles. NO3- instead of NH4+ was preferred in the range of KNO3 > NaNO3 > NH4NO3 > (NH2)2CO for maximum biomass and lipid production. Maximum biomass, TL and CV (0.843gL-1, 42.7% and 20.6 kJg-1 respectively) were determined in the medium containing KNO3 (17.6 mM). A close linear correlation between an increase in TL and CV was observed (R²= 0.9461). With the further augmentation of TL and improved biomass yield the native strain of microalgae Afaleatus could be a potent candidate for biofuel production.
- Subjects
BIOMASS energy; CARBON compounds; ANKISTRODESMUS falcatus; BIOMASS production; PLANT lipids; NITROGEN in water; PHOTOPERIODISM; NITROGEN content of algae
- Publication
Environmental Research, Engineering & Management / Aplinkos Tyrimai, Inžinerija ir Vadyba, 2012, Vol 61, Issue 3, p14
- ISSN
1392-1649
- Publication type
Article
- DOI
10.5755/j01.erem.61.3.1423