Application of biological processes for the removal of arsenic from groundwaters

 
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Application of biological processes for the removal of arsenic from groundwaters

Zoumpoulis, Anastasios
Katsoyiannis, I.A.

Bacteria are widespread, abundant, geochemically reactive components of aquatic environments. In particular, ironoxidizing 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 mg/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

Article / Άρθρο
info:eu-repo/semantics/article

Removal
Biological oxidation
Arsenic
Iron oxidizing bacteria
Iron oxides

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (EL)
Aristotle University of Thessaloniki (EN)

2004
2009-07-10T09:46:03Z


Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας

Water Research, vol.38 [2004] p.17-26 [Published Version]
urn:ISSN:00431354

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info:eu-repo/semantics/openAccess



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