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Effect of Ionic Molar Conductivity on Separation Characteristics of Heavy Metals by Nanofiltration Membranes in Waste Water
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 Title & Authors
Effect of Ionic Molar Conductivity on Separation Characteristics of Heavy Metals by Nanofiltration Membranes in Waste Water
Oh, Jeong-Ik;
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Generally, the characteristic of nanofiltration membranes were catagorized into charged membrane, sieve effect, interaction between membarnes and target solutes. This study aims to investigate the effect item of heavy metal separation with view of charge nanofiltration membranes. The experiments of nanofiltration were conducted by nanofiltration set-up with operational pressure of 0.24 MPa at by using synthetic wastewater containing 0.1mg/L of Cr, Fe, Cu, Zn, As, Sn, Pb. Nanofiltration membranes rejected heavy metals much better than chloride, sulfate and TOC, of which concentration in synthetic wastewater was higher than that of heavy metals. To consider rejection characteristics of various metals by nanofiltration membranes, separation coefficient, which is the molar conductivity ratio of the metal permeation rate to the chloride ion or TOC permeation rate, was introduced. In spite of different materials and different nominal salt rejection of nanofiltration membrane used, the separation coefficients of metals were nearly the same. These phenomena were observed in the relationship between the molar conductivity and the separation coefficient for heavy metals.
Nanofiltration;Heavy Metal;Separation Coefficient;Molar Conductivity;Rejection;
 Cited by
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