| IWA Publishing Journals | | | Subscriptions | | | Authors | | | Users | | | Librarians | | | FAQs |
 |
Water Science & Technology Vol 66 No 1 pp 173–178 © IWA Publishing 2012 doi:10.2166/wst.2012.151 Influence of groundwater composition on subsurface iron and arsenic removalD. H. Moed, D. van Halem, J. Q. J. C. Verberk, G. L. Amy and J. C. van DijkDelft University of Technology, Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628 CN Delft, The Netherlands E-mail: D.H.Moed@tudelft.nlUNESCO-IHE, Westvest 7, 2611 AX Delft, The Netherlands Present address: King Abdullah University of Science and Technology, P.O. Box 55455, Thuwal 34, Saudi Arabia ABSTRACT Subsurface arsenic and iron removal (SAR/SIR) is a novel technology to remove arsenic, iron and other groundwater components by using the subsoil. This research project investigated the influence of the groundwater composition on subsurface treatment. In anoxic sand column experiments, with synthetic groundwater and virgin sand, it was found that several dissolved substances in groundwater compete for adsorption sites with arsenic and iron. The presence of 0.01 mmol L−1 phosphate, 0.2 mmol L−1 silicate, and 1 mmol L−1 nitrate greatly reduced the efficiency of SAR, illustrating the vulnerability of this technology in diverse geochemical settings. SIR was not as sensitive to other inorganic groundwater compounds, though iron retardation was limited by 1.2 mmol L−1 calcium and 0.06 mmol L−1 manganese. Keywords: competitive adsorption; drinking water treatment; groundwater; subsurface arsenic removal; subsurface iron removal eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
|
 |
