BULK-PHASE CRITERIA FOR NEGATIVE-ION REJECTION IN NANOFILTRATION OF MULTICOMPONENT SALT-SOLUTIONS

被引:26
作者
NIELSEN, DW [1 ]
JONSSON, G [1 ]
机构
[1] TECH UNIV DENMARK,DEPT CHEM,DK-2800 LYNGBY,DENMARK
关键词
D O I
10.1080/01496399408005623
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An expression for calculating the change in the rejection of a given ion under nanofiltration conditions when adding other salts to the bulk solution has been derived using the extended Nernst-Planck equations. This expression gives a simple means for calculating in which direction the change of the rejection will go from knowledge of the equivalent conductance and the concentration changes of the ions added to the bulk solution. Using the multisalt system NaNO3-Na2SO4-HCl as an example, the nitrate rejection plane was calculated from the derived model. The experimental nitrate rejection data fit very nicely into this plane, showing increasing negative rejections by increasing the Na2SO4 concentration which can be reversed by the addition of HCI to the bulk solution.
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页码:1165 / 1182
页数:18
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