Mw.ir. A. Wolthoorn : Subsurface aeration of anaerobic groundwater

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5 Sep 2003 16:00
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. W.H. van Riemsdijk (Soil Chemistry and Chemical Soil Quality)
Co Promotor: dr.ir. E.J.M. Temminghoff

 High concentrations of iron and ammonium in anaerobic groundwater need to be removed when groundwater is used for the production of drinking water. Subsurface aeration can be applied to remove iron. As an unexpected effect subsurface aeration can strongly enhance the nitrification in sand filters. Alternatively, subsurface aeration could be used as a practical tool to improve the nitrification process. In this study the fate of iron after subsurface aeration was studied. The potentially mobile iron colloids were of particular interest. The colloids were studied in both the laboratory and the field. The characteristics of the iron colloids were used to prepare a synthetic analogue. In a last experiment the effect of the synthetic colloids on the nitrification was studied using a purification station on a laboratory scale. The results confirmed that (synthetic) iron colloids could be the link between subsurface aeration and the positive effect on the nitrification process.
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