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    Subsurface iron and arsenic removal: Low-cost technology for community-based water supply in Bangladesh

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    Type
    Article
    Authors
    Van Halem, Doris
    Heijman, Bas G J
    Johnston, Richard Bart
    Huq, Imamul M.
    Ghosh, Sanchari K.
    Verberk, Jasper Q J C
    Amy, Gary L.
    Van Dijk, Johannis C.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2010-12
    Permanent link to this record
    http://hdl.handle.net/10754/561605
    
    Metadata
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    Abstract
    The principle of subsurface or in situ iron and arsenic removal is that aerated water is periodically injected into an anoxic aquifer through a tube well, displacing groundwater containing Fe(II). An oxidation zone is created around the tube well where Fe(II) is oxidised. The freshly formed iron hydroxide surfaces provide new sorption sites for soluble Fe(II) andarsenic. The system's efficiency is determined based on the ratio between abstracted volume with reduced iron/arsenic concentrations (V) and the injected volume (Vi). In the field studypresented in this paper, the small-scale application of this technology was investigated in rural Bangladesh. It was found that at small injection volumes (>1m3) iron removal was successful and became more effective with every successive cycle. For arsenic, however, the system did not prove to be very effective yet. Arsenic retardation was only limited and breakthrough of 10mg/L (WHO guideline) was observed before V/Vi = 1, which corresponds to arrival of groundwater at the well. Possible explanations for insufficient arsenic adsorption are the short contact times within the oxidation zone, and the presence of competing anions, like phosphate. © IWA Publishing 2010.
    Citation
    Van Halem, D., Heijman, S. G. J., Johnston, R., Huq, I. M., Ghosh, S. K., Verberk, J. Q. J. C., … van Dijk, J. C. (2010). Subsurface iron and arsenic removal: low-cost technology for community-based water supply in Bangladesh. Water Science and Technology, 62(11), 2702–2709. doi:10.2166/wst.2010.463
    Publisher
    IWA Publishing
    Journal
    Water Science and Technology
    DOI
    10.2166/wst.2010.463
    PubMed ID
    21099059
    ae974a485f413a2113503eed53cd6c53
    10.2166/wst.2010.463
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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