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Evaluation of the Effective Charge Density on Low Pressure Nanofiltration with the Separation Characteristics of Monovalent and Divalent Solutes in the Production of Drinking Water
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  • Journal title : Environmental Engineering Research
  • Volume 16, Issue 1,  2011, pp.29-34
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2011.16.1.029
 Title & Authors
Evaluation of the Effective Charge Density on Low Pressure Nanofiltration with the Separation Characteristics of Monovalent and Divalent Solutes in the Production of Drinking Water
Oh, Jeong-Ik; Taro, Urase;
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The electric charge on a membrane was investigated by analyzing the experimental rejection of various monovalent and divalent ionic solutes. The characteristics of the separation of ionic solutes using various nanofiltration membranes were obtained from an experimental nanofiltration set-up, with a surface area of under the operational pressures between 0.25-0.3 MPa. The state of the membrane electric charge was observed using separation coefficients, i.e., the permeation ratio of monovalent to divalent ions. To confirm the state of the membrane charge observed via the separation coefficient, a calculation using the extended Nernst-Planck equation, coupled with the Donnan equilibrium, assuming different electric charge states of the membrane, was compared with the experimental rejection of ionic solutes. The examination of the characteristics of separation using three types of nanofiltration membranes showed that one of the membranes carried a negative/positive double charge density inside, while other two membranes carried either a positive or negative charge density.
Effective charge density;Ionic solutes;Low pressure;Nanofiltration;Separation coefficient;
 Cited by
이온 몰 전도도가 나노여과막에 의한 폐수 중의 중금속 분리특성에 미치는 영향,오정익;

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