Improving the biological stability of drinking water by ion exchange

To guarantee a good water quality at the consumer’s tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research is to measure the effect of NOM removal by ion exchange on the biological stability of drinking water. Experiments were per...

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Bibliographic Details
Published in:Water science & technology. Water supply 2011-03, Vol.11 (1), p.107-112
Main Authors: GREFTE, A, DIGNUM, M, BAGHOTH, S. A, CORNELISSEN, E. R, RIETVELD, L. C
Format: Article
Language:English
Subjects:
Activated carbon
Applied sciences
ATP
Biofilms
Biofiltration
Biological effects
Buildings. Public works
Carbon
Disinfection
Dissolved organic carbon
Drinking water
Exact sciences and technology
Filtration
Fluidizing
Ion exchange
Organic matter
Oxidation
Ozonation
Ozonization
Paths
Pretreatment
Removal
Stability
Water quality
Water supply. Pipings. Water treatment
Water treatment
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Summary:To guarantee a good water quality at the consumer’s tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research is to measure the effect of NOM removal by ion exchange on the biological stability of drinking water. Experiments were performed in two lanes of the pilot plant of Weesperkarspel in the Netherlands. The lanes consisted of ozonation, softening, biological activated carbon filtration and slow sand filtration. Ion exchange in fluidized form was used as pre-treatment in one lane and removed 50% of the dissolved organic carbon (DOC); the other lane was used as reference. Compared to the reference lane, the assimilable organic carbon (AOC) concentration of the finished water in the lane pretreated by ion exchange was 61% lower. The biofilm formation rate of the finished water was decreased with 70% to 2.0 pg ATP/cm2.day. The achieved concentration of AOC and the values of the biofilm formation rate with ion exchange pre-treatment showed that the biological stability of drinking water can be improved by extending a treatment plant with ion exchange, especially when ozonation is involved as disinfection and oxidation step.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2011.016