دانلود رایگان مقاله انگلیسی بی کربنات سدیم منبع کربن غیر آلی برای تولید بیومس یکپارچه کربن - نشریه الزویر

Abstract

Chlorella vulgaris was isolated from sewerage treatment plant and grown in the presence of sodium bicarbonate as carbon source at 0.25, 0.5 and 1.0 g L−1 . Highest specific growth rate (0.653 μ d−1 ) was obtained with 1 g L−1 bicarbonate followed by 0.5 g L−1 (0.641 d−1 ) on 15th day culturing. Total chlorophyll content of microalgae has increased in a dose dependent fashion with bicarbonate addition and maximum level recorded in 1 g L−1 (0.769 ± 0.09 g L−1 ). The biomass productivity was in the range of 0.237–0.996 g d−1 L−1 . Rate of CO2 fixation and carbon content, in terms of quantity was estimated. Results showed that at 1 g L−1 sodium bicarbonate concentration, maximum CO2 fixation (0.497 g/dry weight) and carbon content (0.69 g mL−1 day−1 ) was found. Biomass concentration was significantly higher (p b 0.05) in cultures (1.54 g L−1 ) supplemented with 1 g L−1 bicarbonate whereas there was no much difference in cellular lipid concentration (16 mg mL−1 ). GC–MS analysis of fatty acids showed highest amounts of palmitic acid, myristic and stearic acid. In summary, the addition of sodium bicarbonate increases cellular abundance, chlorophyll content and to some extent in the case of lipid content in C. vulgaris integrated with CO2 sequestration

Conclusion

This study has the potential to aid industrial algal biofuel production with the use of sodium bicarbonate as an alternative inorganic carbon source to trigger biomass and lipid production. From the results, it was clear that bicarbonate addition had significant effects on pigment, biomass and lipid production in C. vulgaris isolated from sewage treatment plant. Microalgae exposed to 1gL−1 concentration of bicarbonate expressed three times higher biomass concentration compared to other treatments. Further, the amount of total chlorophyll content, CO2 fixation, biomass and lipid productivity were significantly influenced by the addition of sodium bicarbonate.