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امكانية تحفيز بعض الطحالب المعزولة محليا لانتاج الوقود الحيوي == Possibility of stimulation of some locally isolated algae for production of biofeul
Author name:
ثائر محمد ابراهيم العكيلي
Supervisor name:
ابراهيم مهدي عزوز السلمان
General topic:
Biology
Specific topic:
plant - aquatic life
Degree:
Doctorate
University:
University of Baghdad
Language:
Arabic
University location:
Baghdad
First pages:
24T3483 - p.pdf
Abstract:
In the current study, samples of algae have been collecting from( Springs , Streams and Rivulets)including in northern of Iraq (the area on the Iraqi - Iranian and Turkish borders, and from the middle in the areas of (Tarmiya and Alabegi) several races of used algae in biofuels such as : Scendesmus spp , S . quadricouda , S . Dimorphus,Chroococcus sp. ,Chlorococcum humicola , Microcystsp. , Asterococcus sp. ,Chlorella sp , Oscillotoriasp. , Anabena sp , Nostoc. sp. , Ankistrodesmus falcatus.diagnosed , were isolated and prepared pure cultures of Asterococcus sp. , S dimorphus, C.humicola and were selected three culture medium (BG11, Chu13, Chu10)for culturing and development of these algae under controlling conditions (2 ± 25 ° C, intensity of illumination 3000 Lux and 8 : 16 light : darkness system).Experiments include three axes, the first representing the study of the influence of media - type and installed in curves and growth rates (K) and doubling time(G) and estimate the biomass of the tested algae, in addition to monitoring the effectiveness of the quality of the medium in the chemical content of algae and of (total of lipids, proteins, carbohydrates content and fatty acids). A second include the treatment are (remove nitrogen from the media, addition NaCl with 2 g.l - 1, addition of vitamins mixture (B1, B6, B12) in the following concentrations (0. 1, 0.1, 0. 01) mg .l - 1, respectively and change the current speed (as a mixing factor) of 400 and 850 l. h - 1). Third axis include the efficiency of the Photobioreactor system test (Tubular Photobioreactor named( I.TH.1) designed by a researchers for the purpose of comparison between culturing in bottles and the possibility of the application of expandingproduction in the reactor system of 120 liters, for testing C. humicola in Chu13media.The results showed that the highest growth rate recorded in BG11 for Asterococcus sp, was 0.343 cells . day - 1 depending on the absorbance values at of 650 nm wavelength, while the highest rate depending on the number of cells scored in Chu13 after the addition of vitamins mixture for C.humicola was 1.16 cells .day - 1, while the lowest growth rate(K) scored in Asterococcus sp, In Chu10 after the removal of nitrogen and reached 0.04 cells . day - 1, as less doubled time(G) scored when Chu13 after the addition of NaCl to Asterococcus sp, and reached 1.12 day depending on the absorbance values, while less doubling time(G) was relying on the number of cells in C.humicola in Chu13 after the addition of vitamins and amounted to 0.257day.The highest doubled time(G)13.7 and 15.05 day was scored in BG11 after removing N2 form culture medium of Asterococcus sp, depending on the absorbance values and the number of cells respectively. The highest biomass value recorded at Asterococcus sp with current speed 400 l.h - 1 and amounted to 0.724 mg .g - 1 dry weight,while the less biomass0.203 mg.g - 1 dry weight at the same algal after the addition of NaCl to Chu10 .The highest value of total lipids recorded at removing nitrogen from the Chu13 inS.dimorphus amounted 320.8 mg . g - 1 (dry weight) while it was less than at the C.humicola in control. As Chu10 recorded the highest percentage of total lipids was registered at S.dimorphus in BG11 after removing nitrogen and stood at 81.48%. The lowest percentage was registered with C.humicola in Chu10 amounted to 32.49%.The highest amount of total proteins , when Asterococcus sp developed at current speed of 400 l . h - 1 in Chu13 amounted to 299.7 mg . g - 1 (dry weight), while the least value was registered at S.dimorphus amounted to 8.9 mg . g - 1 in BG11 - free of nitrogen. While recorded the highest percentage of total proteins when Asterococcus sp, after the addition of NaCl to BG11media and amounted to 51.17%, while the lowest percentage was registered to the same alga after removing nitrogen from the BG11 and amounted to 5.7%.Results prepared that the highest amount of total carbohydrates, was recorded in the S.dimorphus when the velocity of 400 l . h - 1 and amounted to 63.09 mg . g - 1 (dry weight), and the least amount was registered in Asterococcus sp in Chu10 after the addition of vitamins. While the highest percentage recorded for carbohydrates in S.dimorphus in control BG11 reached 41.67%,and the lowest percentage was in Asterococcus sp at Chu10 after the addition of a mixture of vitamins and stood at 4.65% .When the follow - up impact of the transactions used in the experiments in quality and quantity of fatty acid (Luric, Palmetic, Stearic, Lionoleic, α - liolenic, Oleic, Archidic, DHA), we find that the the final concentrations have varied significantly, recorded acids Luric, Palmetic, Stearic higher concentrations when Asterococcus sp. In Chu13 after the addition of NaCl first and, second and was 46.7, 381.27 mg . l - 1, respectively, while the acid Stearic amounted to 117.0 mg . l - 1 after removing nitrogen from BG11. While α - linoleic, Linoleic asid recorded the highest amount it reached 188.3, 22.7mg.l - 1 when Chu10 after the addition of vitamins and at the speed of 400 l . h - 1, respectively, for Asterococcus sp, As Oleic, Archidic, DHA acids recorded the highest amount in C.humicola amounted to 125.08, 131.8,175.65 mg .l - 1 , at the current speed of 400 l . h - 1 in the first and second acides, when BG11 after removing nitrogen, DHA acid,as in terms of percentages acids, we find that the current study showed the highest percentage of Linoleic, Luric amounted to 39.69, 84.9% at the control Chu10 and Chu13 after treatment with vitamins respectively in Asterococcus sp.While DHA Oleic, α - linoleic, Stearic acids recorded highest percentage reached to 43.39, 44.25, 46.71, 46.85%, respectively, in S.dimorphus in BG11control , after treatment with vitamins to Chu10and after the addition NaCl toBG11respectively . As Archidic, Palmetic acids recorded the highest percentage in C.humicola amounted to 28.42, 62.6%, respectively, in BG11control and the speed 850 l . h - 1.the highest amount of saturated fatty acids S.F.A recorded in Asterococcus sp. and it amounted to 951.7 mg . l - 1 after the addition NaCl to Chu13 .The highest percentage was registered at the same alga 92.5% in Chu13control. Current studie also recorded the highest amount of unsaturated fatty acid U.F.A recorded in Asterococcus sp. and it amounted to 488.2 mg .l - 1 when adding vitamins to Chu10, while the highest percentage recorded in S.dimorphus amounted to 91.79% when adding NaCl to BG11.I n applying the experience of the test reactor, the photobioreactor of 120 liters and choosing alga C.humicola inChu13 and 400 l .h - 1, we find that the system I.TH.1 has given the results and the differences were not significant in terms of impact on growth rates and the doubling time of replication when compared with the first and second controls(Chu13 represent first control sized 150 ml and the process to shake once a day and the second control mixing factor 400 l . h - 1 in 3 - liter size). In terms of the impact of I.TH.1 on the biomass it has increased significantly when the first control while non - significant differences were recorded for the second control at the level of probability (P≤ 0.05) either when the effect in the chemical content of the total of studied alga, we find it recorded 199.6, 200.5, 198.2 mg . g - 1 of total lipids and 218.5, 214.3, 185.9 mg . g - 1 of total proteins and 147.7, 165.1, 143.2 mg . g - 1 of total carbohydrates in the first , second control, I.TH.1respectively. These results show no significant differences between the results of I.TH.1 and education in bottles laboratory. either at the level of the quantity and quality of fatty acids, we find that there is variation in the results as recorded all the fatty acid was significantly higher for the first control except Luric acid which disappeared from the second control and I.TH.1 , while there was a significant decrease in α - Liolenic, Olice, Archidic acids. While I.TH.I recorded an increase in Palmetic, Linolic, DHA acids compared with the second control, with the advent of acidic Myrestic and Stiric in the system and the disappearance in two controls, That shows the importance of the use of these bioreactors in the biofuel production studys.
