پيامد هوموسي شدن کاه گندم و توانايي ريزجانداران آن بر جذب زيستي سرب از يک آب آلوده
Journal Title: آب و فاضلاب - Year 2016, Vol 27, Issue 4
Abstract
Adsorption of Pb(II) from Aqueous Solutions on Wheat Straw: Effects of Humification and Sterilization Abstract Biosorption is one of the methods used for the separation of heavy metals from aquatic environments. The objective of this study was to investigate wheat straw humification and the capability of its microorganisms for the biosorption of Pb from aqueous solutions. Wheat straw (<2 mm) was incubated under lab conditions with a moisture content of 70% for 60 days. Samples from the incubated straw were taken on days 1, 20, and 60 to determine their physical, chemical, and biological properties. Two sterilized and non-sterilized subsamples were also prepared and Pb adsorption isotherms on the subsamples were studied in NaNO3 solution (0.001 N) with different Pb concentrations at pH 6. Among the Langmuir, Freundlich, and Temkine models, only the latter failed to fit Pb adsorption data. The highest sorption capacities (qmax) were obtained by the Langmuir model for the humified and unsterile sample (108.41 mg g‒1) and the lowest was obtained for the fresh and sterile sample (63.36 mg g‒1). Lead adsorption increased significantly with incubation time and its highest values were recorded with unsterile straw samples taken on days 1, 20, and 60 which were equal to 32.21, 43, and 60.96%, respectively, for the highest Pb concentration. The Langmuir constant (Kl) and Freundlich constants (Kf and n) were significantly higher for the more humified wheat straw samples compared to those for raw straw. All the adsorption parameters recorded higher values with the unsterile wheat straw compared to the sterile one, indicating the ability of the microorganisms to adsorb Pb from aqueous solutions.
Authors and Affiliations
Ali Akbar Safari Sinegani, Roghaye Bagheri
Keywords
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