Selective removal of nitrate ions from water or aq. solns. - by ion exchange using succession of columns with weakly acidic cation exchanger then weakly basic anion exchanger before entering column filled with buffer

Selective removal of nitrate ions from water or aq. solns. - by ion exchange using succession of columns with weakly acidic cation exchanger then weakly basic anion exchanger before entering column filled with buffer

The removal of nitrate ions from water or aq. solns. is achieved by passing the liq. through a succession of exchange columns, whereby column (I) is filled with a weakly acidic cation exchanger, column (II) is filled with a nitrate-selective, weakly basic anion exchanger and column (III) is filled w...

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Bibliographische Detailangaben
Hauptverfasser: HAUPTMANN, RUEDIGER., O-4090 HALLE, DE, FROEHLICH, PETER, DR., O-4090 HALLE, DE, SCHOLZE, CHRISTIAN, O-8027 DRESDEN, DE, SCHWACHULA, GERHARD, DR., O-4500 DESSAU, DE
Format: Patent
Sprache:eng ; ger
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Zusammenfassung:The removal of nitrate ions from water or aq. solns. is achieved by passing the liq. through a succession of exchange columns, whereby column (I) is filled with a weakly acidic cation exchanger, column (II) is filled with a nitrate-selective, weakly basic anion exchanger and column (III) is filled with a buffer. (I) contains an H(+)-type cation exchanger and (III) contains either a Na(+)- and/or Ca(2+)-type weakly acidic cation exchanger or a weakly basic OH(-) or CaCO3-type anion exchanger, whereby if (III) contains a weakly acid cation exchanger, the positions of (I) and (III) are interchangeable, depending on the nature of the packing of the respective columns. A sprinkler is pref. placed between (I) and (II). ADVANTAGE - The process allows for a selective removal of nitrate ions from both neutral and acidic media with enhanced efficiency.