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Sodium and Potassium Removal From Brackish Water by Nanofiltration Membrane: Single and Binary Salt Mixtures Publisher



Fatehizadeh A1, 2 ; Taheri E1, 3 ; Amin MM1, 2 ; Mahdavi M4, 5 ; Moradi N1, 3
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Environment Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Student Research Committee, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Social Determinants of Health Research Center, Saveh University of Medical Sciences, Saveh, Iran
  5. 5. Environmental Health Engineering, Saveh University of Medical Sciences, Saveh, Iran

Source: Desalination and Water Treatment Published:2018


Abstract

In this study, the removal efficiency of sodium (Na+) and potassium (K+) by nanofiltration (NF) process was investigated. The experiments was conducted by variation of influent concentration of Na+ and K+, flow rate, solution pH and also co-existing anions and cations. The results showed that with increasing influent concentration of Na+ from 200 to 400 mg/L, the removal efficiency decreased from 68.9% to 63.1% and K+ removal efficiency declined from 89.1% to 83.4% with increasing concentration from 20 to 60 mg/L. As the solution pH was raised from 4 to 9, the Na+ and K+ removal efficiency increased from 66.5% to 74.1% and 87.5% to 93.5% and correspondence with deceasing the concentration of Na+ and K+ in permeate water from 67.1 mg/L to 51.8 mg/L and from 2.51 mg/L to 1.32 mg/L, respectively. In addition, as the flow rate was varied of 0.4 L/min to 0.8 L/min, the Na+ and K+ rejection by NF descended approximately 5%. The most important of effective co-exist anions and cations on Na+ and K+ rejection were nitrate and magnesium, respectively. Consequently, the NF process was recognized as efficient, convenience and low cost method for Na+ and K+ removal from brackish water. © 2018 Desalination Publications. All rights reserved.
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