Application of biological processes for the removal of arsenic from groundwaters
DOI: 10.1016/j.watres.2003.09.011
Title: Application of biological processes for the removal of arsenic from groundwaters
Journal Title: Water Research
Volume: 38
Issue: 1
Publication Date: January 2004
Start Page: 17
End Page: 26
Published online: online 21 October 2003
ISSN: 0043-1354
Affiliations:
  • Laboratory of General and Inorganic Chemical Technology, Department of Chemistry, Aristotle University, Thessaloniki 54124, Greece
  • Abstract: are widespread, abundant, geochemically reactive components of aquatic environments. In particular, iron-oxidizing bacteria, are involved in the oxidation and subsequent precipitation of ferrous ions. Due to this property, they have been applied in drinking water treatment processes, in order to accelerate the removal of ferrous iron from groundwaters. Iron also exerts a strong influence on arsenic concentrations in groundwater sources, while iron oxides are efficient adsorbents in arsenic removal processes. In the present study, the removal of arsenic (III and V), during biological iron oxidation has been investigated. The results showed that both inorganic forms of arsenic could be efficiently treated, for the concentration range of interest in drinking water (50–200 μg/L). In addition, the oxidation of trivalent arsenic was found to be catalyzed by bacteria, leading to enhanced overall arsenic removal, because arsenic in the form of arsenites cannot be efficiently sorbed onto iron oxides. This method comprises a cost competitive technology, which can find Application in treatment of groundwaters with elevated concentrations of iron and arsenic.
    Accepted: 12 September 2003
    Received: 20 August 2002
    Revised: 1 September 2003
    Email: zoubouli@chem.auth.gr

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