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Electrodialytic removal of nitrates and hardness from simulated mixtures using ion‐exchange membranes
Author(s) -
Nataraj S. K.,
Hosamani K. M.,
Aminabhavi T. M.
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22710
Subject(s) - electrodialysis , membrane , aqueous solution , limiting current , chemistry , ion exchange , water treatment , reverse osmosis , brackish water , sodium nitrate , chloride , inorganic chemistry , ion , chemical engineering , environmental engineering , salinity , electrochemistry , environmental science , electrode , organic chemistry , ecology , biochemistry , engineering , biology
A novel electrodialysis (ED) pilot plant unit coupled with a membrane stack containing 11 cation‐exchange and 10 anion‐exchange membranes is used for the removal of nitrates and hardness from simulated aqueous mixtures containing salts that are usually encountered in brackish water. The removal of high nitrates and water hardness is performed in 150 min of ED under three constant applied voltages at room temperature. The limiting current density is obtained for sodium nitrate and calcium chloride mixtures in dilute solution. In order to check the efficacy of the ED method, parameters like the applied potential are varied at constant flow rates. The efficiency of the ED method depends on the applied potential. Possible applications of ED are discussed for the removal of contaminants below the minimum contaminant level of drinking water. The ED method used here is satisfactory to produce good quality drinking water from a simulated mixture by removing the unwanted ions. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1788–1794, 2006