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Selective renovation of eutrophic wastes phosphate/sulphate exchange

Authors
Journal
Water Research
0043-1354
Publisher
Elsevier
Publication Date
Volume
11
Issue
6
Identifiers
DOI: 10.1016/0043-1354(77)90039-2

Abstract

Abstract After distinct selectivity evaluation of different anion resins for the sulphate-chloride and phosphate-chloride systems, resin affinities for the sulphate-phosphate system have been measured Experimental determinations show that selectivities are strongly dependent on resin basicity and solution pH. As for the basic causes of selectivity, both hydrostatic and electrostatic interactions appear to be determinant. The following overall selectivity sequence: phosphates > sulphates ⪢ chlorides is demonstrated for commercial, weak base resins, with prevailingly II ary amino type functional groups. The dephosphation of conventionally treated urban sewages by resins of this type is proposed, using sodium chloride as regenerant.

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