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Maximizing Biomass Productivity and CO2 Biofixation of Microalga, Scenedesmus sp. by Using Sodium Hydroxide

( Manoranjan Nayak ),( Swagat S Rath ),( Manikkannan Thirunavoukkarasu ),( Prasanna K Panda ),( Barada K Mishra ),( Rama C Mohanty ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.9
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A series of experiments were carried out with three native strains of microalgae to measure growth rates, biomass, and lipid productivities. Scenedesmus sp. IMMTCC-6 had better biomass growth rate and higher lipid production. The growth, lipid accumulation, and carbon dioxide (CO2) consumption rate of Scenedesmus sp. IMMTCC-6 were tested under different NaOH concentrations in modified BBM. The algal strain showed the maximum specific growth rate (0.474/day), biomass productivity (110.9 mg l-1d-1), and CO2 consumption rate (208.4 mg l-1d-1) with an NaOH concentration of 0.005 M on the 8th day of cultivation. These values were 2.03-, 6.89-, and 6.88-fold more than the algal cultures grown in control conditions (having no NaOH and CO2). The CO2 fixing efficiency of the microalga with other alternative carbon sources like Na2CO3 and NaHCO3 was also investigated and compared. The optimized experimental parameters at shake-flask scale were implemented for scaling up the process in a self-engineered photobioreactor. A significant increase in lipid accumulation (14.23% to 31.74%) by the algal strain from the logarithmic to stationary phases was obtained. The algal lipids were mainly composed of C16/C18 fatty acids, and are desirable for biodiesel production. The study suggests that microalga Scenedesmus sp. IMMTCC-6 is an efficient strain for biodiesel production and CO2 biofixation using stripping solution of NaOH in a cyclic process.
2
Enhanced carbon utilization efficiency and FAME production of Chlorella sp. HS2 through combined supplementation of bicarbonate and carbon dioxide

Nayak, Manoranjan,Suh, William I.,Lee, Bongsoo,Chang, Yong Keun Elsevier 2018 Energy conversion and management Vol.156 No.-
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Abstract The optimum concentration of dissolved carbon in the microalgal culture medium is a vital requirement for enhanced biomass production. The present study investigates the effect of supplying NaHCO3 with CO2 as the inorganic carbon source to enhance the utilization efficiency of CO2 for maximum FAME productivity of Chlorella sp. HS2. The specific growth rate (0.615 d−1), biomass productivity (530.1 mg L−1 d−1), CO2 biofixation rate (996.4 mg L−1 d−1), FAME productivity (141.8 mg L−1 d−1) and FAME content (26.76%) were found to be maximized at NaHCO3 concentration of 0.5 g L−1 with 1% (v/v) CO2 enriched air (0.25 vvm flow rate) supplementation in shake flask condition. The FAME productivity (169.37 mg L−1 d−1) and FAME content (31.2%) were 1.19 and 1.16 times higher respectively in the flat panel photobioreactor than in shake flask condition. Fatty acid profile and biofuel properties show suitability for biodiesel production. The economic assessment revealed that combining supplementation of both carbon sources greatly reduces the carbon supply costs, from $8.92 Kg−1 when only NaHCO3 was used as the carbon source down to $0.86 Kg−1 when 1% CO2 was supplied alongside NaHCO3. These findings show that combined application of NaHCO3 and CO2 is the more cost-effective approach of supplying carbon source to microalgae for FAME production. Highlights <UL> <LI> Maximum biomass and FAME productivity occurred at 0.5 g L−1 NaHCO3 and 1% CO2. </LI> <LI> Up to 542.9 mg L−1 d−1 biomass productivity and 31.2% FAME content were achieved. </LI> <LI> FAME profile showed that Chlorella sp. HS2 lipid was suitable for use as biodiesel. </LI> <LI> Carbon input cost for FAME was reduced to $0.72 Kg−1 with both carbon sources. </LI> </UL> Graphical abstract [DISPLAY OMISSION]

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