Abstract
AbstractMembrane‐filtration or dialysis techniques are increasingly used for the partial desalting of waters, e.g. brackish waters. By the use of Bulgarian PAN and acetate‐cellulose separating membranes there are eliminated also organic substances – inclusive of humic matter – from natural waters to different degrees. The experimental arrangement is described and the measured results for COD‐Mn, concentrations of humic acid and specific electrolytic conductivity are summarized in tables. The humic acid concentration (2.8 mg/l) was reduced by about 79 % by ultrafiltration, 82 % by reverse osmosis and 62 % by electrodialysis. The efficiency of the investigated techniques could be increased under certain conditions.
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