Cultivation of Scenedesmus dimorphus for C/N/P removal and lipid production

Background CO2 emission, water pollution and petroleum shortage are the issues coming with the development of industry. A cost effective system was constructed to fix the CO2 in flue gas (15% CO2), remove nitrogen and phosphorus from manure wastewater and produce biofuels at the same time. The significant cultivation conditions were selected by Plackett-Burman design, and then optimized with central composite design. Results Optimum culture condition was predicted at light intensity of 238 µmol·m- 2·s- 1, TN of 152 mg·L- 1, inoculum density of 0.3 g·L- 1, under which the measured CO2 fixation rate, total nitrogen and phosphorus removing rate, and lipid content were 638.13 mg·L- 1·d- 1, 88.16%, 73.98% and 11.9%, respectively. The lipid content was then enhanced to 24.2% by a nitrogen starvation strategy. Conclusion A cultivation strategy was suggested to achieve effective C/N/P removal from flue gas and manure wastewater, and meanwhile obtained high lipid content from microalgal biomass.

Effect of molybdenum,vitamin [C] and vitamin [B[1]] on the growth criteria, photosynthetic pigments and metabolic activities of stressed-scenedesmus obliquus cultures

The growth criteria [cell count and dry weight] and total photosynthetic pigments, total carbohydrates, total proteins, free amino acids and praline of stressed- Scenedesmus obliquus cultures were significantly increased up to the level 3 ppm of MoCl[2] of that the control cultures, there above the values all these parameters were significantly decreased. When treated stressed-Scenedesmus obliquus cultures with 200 ppm of either ascorbic acid or thlamine were both supplemented of them separately, the growth criteria, total photosynthetic pigments, total proteins, free amino acids and praline of stressed-Scenedesmus obliquus cultures were significantly increased, as comparison with that the control cultures. Conversely, the total carbohydrate contents significantly decreased, when the algal cultures subjected to various levels [1.5, 3 and 4.5 ppm] of MoCl[2] and treated with 200 of either ascorbic acid or thiamine