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Drinking Water Engineering and Science An interactive open-access journal
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Volume 8, issue 2
Drink. Water Eng. Sci., 8, 25–34, 2015
https://doi.org/10.5194/dwes-8-25-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Drink. Water Eng. Sci., 8, 25–34, 2015
https://doi.org/10.5194/dwes-8-25-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Sep 2015

Research article | 17 Sep 2015

Conversion of organic micropollutants with limited bromate formation during the Peroxone process in drinking water treatment

A. H. Knol1, K. Lekkerkerker-Teunissen1, C. J. Houtman2, J. Scheideler3, A. Ried3, and J. C. van Dijk4 A. H. Knol et al.
  • 1Dunea N.V., P.O. Box 756, 2700 AT Zoetermeer, the Netherlands
  • 2Het Waterlaboratorium, P.O. Box 734, 2003 RS Haarlem, the Netherlands
  • 3Xylem, Boschstrasse 4–14, 32051 Herford, Germany
  • 4TU Delft, Stevinweg 1, 2628 CN Delft, the Netherlands

Abstract. Advanced oxidation with O3 / H2O2 (peroxone) was conducted on pilot plant scale on pre-treated Meuse river water to investigate the conversion of organic micropollutants (OMPs) and the formation of bromate. Fourteen selected model compounds were dosed to the pre-treated river water on a regular basis to assess the efficiency of the peroxone process and to establish the influence of the water matrix.

The ozone dose was the main factor in the conversion of the model compounds, however, the ozone dose was limited because of bromate formation. The hydrogen peroxide dosage had only a minor effect on the conversion, but it limited the bromate formation effectively. In terms of limited chemical consumption, maximal conversion and to comply the strict Dutch drinking water act for bromate of 1 μg L−1, a practical peroxone setting was 6 mg L−1 hydrogen peroxide and 1.5 mg L−1 ozone. During the investigation period, the average conversion of the model compounds was 78.9 %.

The conversion of OMPs was higher at higher water temperatures and lower concentrations of DOC and bicarbonate. The bromate formation also was higher at higher water temperature and lower bicarbonate concentration and proportional with the bromide concentration, above a threshold of about 32 μg L−1 bromide. The peroxone process can be controlled on basis of the (derived) parameters water temperature, bicarbonate and DOC.

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