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Nitrate Removal by Continuous Electropermutation Using Ion-Exchange Textile: II. Experimental Investigation
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory.ORCID iD: 0000-0002-9392-9059
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory.ORCID iD: 0000-0002-2906-9306
2006 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 153, no 4, D62-D67 p.Article in journal (Refereed) Published
Abstract [en]

Water with nitrate concentrations above 100 ppm has been treated with continuous electropermutation which partially substitutes the nitrate with chloride. The performance of a textile anion exchanger as conducting spacer in the feed compartment of an electropermutation cell was investigated. Experiments with and without textile are compared and the influence of the textile is discussed. The process could, using the textile, successfully treat feed water with 105 ppm nitrate to produce a water with less than 25 ppm nitrate. The importance of establishing a good contact between the membranes and the textile spacer was pointed out. The experimental results were compared to model predictions and a good agreement was found.

Place, publisher, year, edition, pages
2006. Vol. 153, no 4, D62-D67 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-5791DOI: 10.1149/1.2170659ISI: 000235723600040Scopus ID: 2-s2.0-33644803700OAI: oai:DiVA.org:kth-5791DiVA: diva2:10288
Note

QC 20141127

Available from: 2006-05-23 Created: 2006-05-23 Last updated: 2014-11-27Bibliographically approved
In thesis
1. Electropermutation assisted by ion-exchange textile: removal of nitrate from drinking water
Open this publication in new window or tab >>Electropermutation assisted by ion-exchange textile: removal of nitrate from drinking water
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Increased levels of nitrate in ground water have made many wells unsuitable as sources for drinking water. In this thesis an ion-exchang eassisted electromembrane process, suitable for nitrate removal, is investigated both theoretically and experimentally. An ion-exchange textile material is introduced as a conducting spacer in the feed compartment of an electropermutation cell. The sheet shaped structure of the textile makes it easy to incorporate into the cell. High permeability and fast ion-exchange kinetics, compared to ion-exchange resins, are other attractive features of the ion-exchange textile.

A steady-state model based on the conservation of the ionic species is developed. The governing equations on the microscopic level are volume averaged to give macro-homogeneous equations. The model equations are analyzed and relevant simplifications are motivated and introduced. Dimensionless parameters governing the continuous electropermutation process are identified and their influence on the process are discussed. The mathematical model can be used as a tool when optimising the process parameters and designing equipment.

An experimental study that aimed to show the positive influence of using the ion-exchange textile in the feed compartment of an continuous electropermutation process is presented. The incorporation of the ion-exchange textile significantly improves the nitrate removal rate at the same time as the power consumption is decreased. A superficial solution of sodium nitrate with a initial nitrate concentration of 105 ppm was treated. A product stream with less than 20 ppm nitrate could be obtained, in a single pass mode of operation. Its concluded from these experiments that continuous electropermutation using ion-exchange textile provides an interesting alternative for nitrate removal, in drinking water production. The predictions of the mathematical model are compared with experimental results and a good agreement is obtained.

Enhanced water dissociation is known to take place at the surface of ion-exchange membranes in electromembrane processes operated above the limiting current density. A model for this enhanced water dissociation in presented in the thesis. The model makes it possible to incorporate the effect of water dissociation as a heterogeneous surface reaction. Results from simulations of electropermutation with and without ion-exchange textile incorporated are presented. The influence of the water dissociation is investigated with the developed model.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-MEK, ISSN 0348-467X ; 2006:10
Keyword
Ion-exchange textile, Ion-exchange membrane, Electropermutation, Electroextraction, Electrodialysis, Electrodeionisation, Modeling, Conducting spacer, Nitrate removal, Water treatment, Water dissociation
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-3992 (URN)
Public defence
2006-06-08, D3, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101118Available from: 2006-05-23 Created: 2006-05-23 Last updated: 2010-11-18Bibliographically approved

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Behm, MårtenDahlkild, Anders

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