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عزل وتشخيص بعض الانواع الجرثومية من مياه الانهر الداخلية في مدينة البصرة ودراسة قابليتها على المعالجة الحيوية للعناصر الثقيلة == Isolation and identification bacterial species from inner rivers in Basra governorate and study their ability to Bioremediation of heavy metals
Author name:
انوار عبد الوهاب مكي
Supervisor name:
علي عبود شريف
General topic:
Biology
Specific topic:
Microbiology
Degree:
Master
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
24T3530 - p.pdf
Abstract:
The present study was conducted during November and December 2013.It included studying six inner rivers branching from Shatt al - Arab river in Basrah governorate.These rivers are Abu Al - khasseb, Al - Ribat, Al - Khandaq, Al - Ashar, Al - Khura and Al - Sarraji .The study included isolation and identification of three species of genus Bacillus which are B. licheniformis,B. megaterium and B. badius ,and two species of genus Micrococcus which are M. halobius and M. kristinae .Physical and chemical characteristics of the water samples were measured, which including pH,temperature,electric conductivity and Dissolved oxygen. The results showed that there were not correlation between physical and chemical characteristics and the concentrations of the heavy metals except for water temperature which had a negative significant correlation with the concentrations of nickel and lead.The concentrations of heavy metal dissolved in water (copper, nickel , lead and cadmium ) were measured. The concentrations of Cu+2 and Pb+2 were higher than that of Ni+2 and Cd+2 in the water .However,in general the concentrations of Cu+2, Ni+2, Pb+2 and Cd+2 were high in comparison with the local and international standards.All species of bacteria showed high resistance to the heavy metals ions starting from concentration of 1 mg/l. B. licheniformis was recorded high resistance to Pb+2, Cu+2 and Ni+2 which reached 2600 mg/l, 500mg/l and 300mg/l respectively. M. halobius was also recorded a high resistance to Pb+2 and Cd+2 with 2600mg/l and 400mg/l respectively. The highest resistance was recorded by M. kristinae to nickel with 300 mg/l . The mid resistance was by B.badius to all studied heavy metals and the lowest was by B. megaterium to all heavy metals studied in comparison with the other species of bacteria.The identified bacteria were used in the process of bioremediation of the heavy metals (Cu+2, Ni+2, Pb+2, Cd+2) with different concentrations (25, 50 and100 ) mg / l. B. licheniformis showed high ability to remove Ni+2, Cu+2 and Cd+2 than other species of bacteria, which reached (28.30%, 44.34% and 24.27%) mg/l. . respectively. B. badius showed a high capability for removing Cu+2 with 45.78% mg / l .Where as B. megaterium showed a high capability for removing Pb+2 with 23.43% mg / l.. M. halobius had the highest capability for removing Cd+2 with 25.42% mg / l. and M. kristinae had a mid capability to remove the heavy metals under studied.The study included observing the effect of the incubation period on removing the heavy metals ions.The results found that the best period was 72 hours in comparison with 24 and 48 hours.Also, the study included the effect of initial concentration in the process bioremediation.The results showed that the concentration of 25mg/l was the best for removing the heavy metals ions among the other concentrations, 50 and 100 mg/l.
