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Biosorption of Zinc Ions Using Biomasses Produced From Four Different Types of Microbes Under Batch and Continuous Conditions

Hosseini, Soheil | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39771 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Roostaazad, Reza; Razavi, Jalil
  7. Abstract:
  8. Biosorption capacity of zinc (II) by biomasses produced from four species of microorganism including two kinds of bacteria (Pseudomonas putida and Streptomyces rimosus) and two kinds of fungi ( Aspergillus niger and Phanerochate chrysosporium) in batch case were investigated and compared. In all cases dried original bio mass and dried pretreated bio mass with NaOH were used. In all cases biosorption capacity of pretreated biomasses were much higher than non-treated biuomasses to the ratio of 3.8 – 1.4 times. Freundlich and Langmuir equilibrium isotherms were used to match with experimental results of this research. Except S.rimosus, all others were completely matched with Langmuir equilibrium isotherm. Results of sorption kinetics for all biomasses are from pseudo- second order. This investigation shows that maximum rate of sorption is in the p.H range of 6-5 . Generally, P.chrysosporium fungus biomasses, specially when pretreated with NaOH, high sorption capacity compared to other biomasses. Also, continuous experiments on fixed-bed were designed and done in order to evaluate performance of sorptive columns. For this purpose a special kind of porous poly-propylene structured packing was designed and used. Immobilization of biomasses was maximum for P.chrysosporium fungus biomasses. Break through curves and effects of bed length, feed flow rate and initial inlet concentrations on these curves were investigated
  9. Keywords:
  10. Bioabsorption ; ZINC ; Fixed-Bed ; Langmuir Monolayer ; Microorganisms ; Polypropylene Packings

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