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Drinking Water Engineering and Science An interactive open-access journal

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© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
05 Jun 2008
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This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.
Removal of both dissolved and particulate iron from groundwater
K. Teunissen1, A. Abrahamse2, H. Leijssen3, L. Rietveld1, and H. van Dijk1 1Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands
2Kiwa Water Research, PO Box 1072, 3430 BB Nieuwegein, The Netherlands
3Vitens Flevoland, PO Box 1090, 8200 BB Lelystad, The Netherlands
Abstract. Iron is the primary source for discolouration problems in the drinking water distribution system. The removal of iron from groundwater is a common treatment step in the production of drinking water. Even when clear water meets the drinking water standards, the water quality in the distribution system can deteriorate due to settling of iron (hydroxide) particles or post-treatment flocculation of dissolved iron. Therefore it is important to remove dissolved and particulate iron to a large extent. This paper describes the study towards the current iron removal processes and experimental work towards improving removal of dissolved and particulate iron. The study was carried out at groundwater treatment plant Harderbroek, consisting of aeration, rapid sand filtration and tower aeration. The research contains two parts: 1) a particle fingerprint of the treatment, resulting in a quantification of particles breaking through the rapid sand filtration. 2) Small column experiments on the oxidation and filterability of iron. The fingerprint showed that operational events such as switching on/off of filters and backwashing have a significant impact on the volume concentration of particles breaking through the filter. A frequency plot of the different size ranges of particles indicates that mainly the filterability of the middle size ranges (2–7 μm) of particles was influenced by switching a filter on/off. A backwash event mainly affects the bigger particle size ranges. The column experiments showed that in the cascade effluent the majority of the iron is dissolved iron(II), indicating that the oxidation of iron(II) to iron(III) is the rate determining step at Harderbroek, which is limited by pH. Dosing caustic soda resulted in a significant increase of the oxidation rate and improved the removal of iron(II) in the column. Crushed limestone filtration gave promising results, but the contact time applied was too short to completely oxidize iron(II).

Citation: Teunissen, K., Abrahamse, A., Leijssen, H., Rietveld, L., and van Dijk, H.: Removal of both dissolved and particulate iron from groundwater, Drink. Water Eng. Sci. Discuss.,, in review, 2008.
K. Teunissen et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC S64: 'Referee comments to Teunissen et al.', Gerald Heinicke, 04 Sep 2008 Printer-friendly Version 
RC S68: 'Referee', Andreas Nahrstedt, 17 Oct 2008 Printer-friendly Version 
RC S71: 'Referee on Removal of both dissolved ...', Andreas Nahrstedt, 17 Oct 2008 Printer-friendly Version 
K. Teunissen et al.
K. Teunissen et al.


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