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This work aimed at attempting bioremediation of uranium VI from waste water by two unicellular immobilized microgreen
algae- spongy composite, as natural biopolymers. The characterization of algae spongy composite was manifested by
Scanning Electron Microscope (SEM), UV and Fourier transform infrared spectra (FTIS). FTIS clarified the presence of
hydroxyl amine groups and uronic acids at the surface of algae spongy composite. An experiment for adsorption of uranium
(VI) by algae- spongy composite was carried out through which the composite impeded to15 cm length glass column (2cm
diameter and 50 cm length) then, multistatic pump was fixed at the top opening of the column and the other ends of the rubber
tube immersed in the waste water. As the pump start and operates the sample withdraw from the waste with the rate of(2mls\
min).The flow rates was repeated three times. The final effluent at each run was collected for titration. The pseudo first-order and
pseudo second-order equations were used to analyze the kinetic data, and the rate constants were determined. The equilibrium
adsorption data of environmental factors on U (VI) adsorption, including: contact time, pH, and initial concentrations of
U (VI) were examined by the Langmuir and Freundlich. The experimental results manifested that the adsorption of U (VI)
by spongy composite was strongly dependent on pH with maximum adsorption of uranium was indicated at pH 2.5, and
shaking at 400 rpm. The adsorption reached equilibrium within 15 minutes. The maximum adsorption capacity was increased
with increasing the concentration of U (VI) up to 125ppm. It reached 12.5mg\g free Scendesmusand 108 mg\g immobilized
Keywords: Adsorption-isotherm, bioremediation, immobilized algae, multistatic pump, spongy composite, uranium.
Islam Samir Shaaban is currently a permanent researcher at Nuclear Materials Authority. He has an M.Sc. degree in Microbiology and Chemistry - 2006, Faculty of Science, Zagazig University, Egypt; and Diploma in Physiology and Biochemistry, Faculty of Science, Suez Canal University.