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Experimental Investigation of Effective Parameters on Lead Ion Removal by Nanofiltration

Mehdipour Zareh, Saber | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46484 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kariminia, Hamidreza; Vatanpoor, Vahid
  7. Abstract:
  8. In this study, the effects of parameters such as operation pressure, concentration of Pb2+ ion, nature of associated anion, pH of initial feed and composition of feed was investigated by commercial polyamide nanofilter membrane. One-salt solution nanofiltration experiments was performed by using Pb(NO3)2, PbCl2 and PbSO4 and the binary-salt solution experiments was conducted by using Cu(NO3)2, Cd(NO3)2, Zn(NO3)2, NaNO3 and NH4NO3 together with Pb(NO3)2. The binary-salt experiments in presence of monovalent and divalent cations (together with Pb2+) were performed successively. At first the surface charge of membrane in contact with 1mM KCl solution at pH range of 3-7 was measured. The pH of Iso-electric point of membrane was found to be 5.3. Operation pressure was changed in the range of 10-40 bar and the lead concentration of 20-400 mg/l. With increasing the operation pressure and concentration of lead ion, the rejection of lead increased. When the associated anion with Pb2+ was changed from NO3- to Cl- and SO42- the rejection of lead at 20 bar, reached from 81% to 83% and 90% respectively. Also the increasing of associated anion valent, resulted in lead rejection increasing and decreasing in permeate flux. In binary-salt solutions, presence of monovalent interfering cations together with lead ion, didn’t have a significant effect on lead rejection, but the presence of Cu2+, Zn2+ and Cd2+ cations with the concentration of 400mg/l, decreased the lead rejection from 92% to 74.6, 79.7 and 80.2% respectively
  9. Keywords:
  10. Heavy Metals ; Nanofiltration Membrane ; Permeation Flux ; Zeta Potential ; Rejection

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