Effect of carbon supply mode on biomass and lipid in CSMCRI's Chlorella variabilis (ATCC 12198) |
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| Affiliation: | 1. Salt and Marine Chemicals Discipline, CSIR- Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India;2. Academy of Scientific & Innovative Research (AcSIR), CSIR- Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India;3. Air Pollution Control (APC) Division, National Environmental Engineering Research Institute, Nagpur, India;1. Chemical Engineering Department, National Institute of Technology Durgapur, West Bengal, India;2. Chemical Engineering Department, National Institute of Technology Agartala, Tripura, India;3. Institute of Bioresources and Sustainable Development, Imphal, Manipur, India;1. School of Environmental Science and Engineering, Shandong University, No. 27 Shanda Nan Road, Jinan 250100, China;2. Shandong Provincial Engineering Centre on Environmental Science and Technology, No. 17923 Jingshi Road, Jinan 250061, China;1. Energy Research Institute, Nanyang Technological University, 1 CleanTech Loop #06-04, Singapore 637141, Singapore;2. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore;3. Wintershine (Asia) Pte Ltd, 13A Teo Hong Road, Singapore 088327, Singapore;1. Department of Biotechnology, Indian Institute of Technology Kharagpur, India;2. Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, India;1. Chemical Engineering Department, National Institute of Technology Durgapur, West Bengal, India;2. Chemical Engineering Department, National Institute of Technology Agartala, Tripura, India;3. Division of Microbiology, Indian Agricultural Research Institute, New Delhi, India;4. Chemical Engineering Department, Jadavpur University, Jadavpur, India |
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| Abstract: | CSIR-CSMCRI's Chlorella variabilis (ATCC 12198) was evaluated through autotrophic, mixotrophic and heterotrophic growth for lipid production. Autotrophic growth was assessed by providing sodium bicarbonate/sodium carbonate/CO2 (air in a medium). Higher lipid productivity (115.94 mg L?1 d?1) with higher biomass productivity (724.98 mg L?1 d?1) of this strain was attained through bicarbonate and CO2 sequestration in a photobioreactor. Ability to regulate the pH in favorable bicarbonate/carbonate ratio showed its potential in alkaline effluent based carbon sequestration system for biofuel generation. The simultaneous study was also conducted to understand the effect of elevated CO2 (0.4, 1 and 1.2 g L?1) in air on the culture to assess adaptation, growth and lipid in the closed chamber conditions. It was observed that CO2 sequestration by the microalgae from the CO2 enriched environment was optimum at 1 g L?1 C. variabilis adapted to comparatively higher CO2 (1 g L?1) but grew better in low CO2 (0.4 g L?1). It was also observed that the growth, lipid content and fatty acid composition was significantly affected by CO2 supply strategies. The effect of intermittently added sodium bicarbonate at different pH on microalgal lipid content and composition of fatty acids was observed which could affect the quality of biodiesel. The effect on fatty acid composition was observed in response to carbon supply mode during the microalgal growth at different pH dictating the properties of biodiesel. |
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| Keywords: | Mixotrophic Bicarbonate Fatty acids Biodiesel |
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