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As(III) removal from groundwaters using fixed-bed upflow bioreactors.

I Katsoyiannis1, A Zouboulis, H Althoff

  • 1Department of Chemistry, Aristotle University, Thessaloniki, Greece.

Chemosphere
|May 9, 2002
PubMed
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Biological oxidation effectively removes arsenic from groundwater by leveraging indigenous bacteria to oxidize iron and manganese. This eco-friendly method achieves significant contaminant reduction without chemical additives.

Area of Science:

  • Environmental Science
  • Microbiology
  • Water Treatment

Background:

  • Groundwater contamination by arsenic, iron, and manganese poses significant risks.
  • Conventional treatment methods often involve chemical additives and complex monitoring.
  • Biological oxidation offers a promising alternative for contaminant removal.

Purpose of the Study:

  • To evaluate the efficacy of biological oxidation for arsenic removal from contaminated groundwater.
  • To investigate the role of indigenous bacteria in oxidizing iron and manganese for contaminant sequestration.
  • To compare the advantages of this biological method against conventional physicochemical treatments.

Main Methods:

  • Utilizing indigenous bacterial species capable of oxidizing soluble iron and manganese ions.

Related Experiment Videos

  • Implementing a filtration medium to separate oxidized, insoluble metal oxides.
  • Optimizing conditions such as dissolved oxygen, redox potential, pH, and flow rate for arsenic removal.

    • Main Results:

    • Achieved over 97% removal of iron and manganese through biological oxidation and filtration.
    • Demonstrated approximately 80% arsenic removal under optimized conditions.
    • Identified specific operational parameters (DO 2.7 mg/l, redox 280-290 mV, pH 7.2, U 8.25 m/h) for effective Fe(II) removal.

    Conclusions:

    • Biological oxidation is a viable and advantageous method for removing arsenic, iron, and manganese from groundwater.
    • This technique eliminates the need for chemical oxidants and simplifies process monitoring compared to conventional methods.
    • The multi-contaminant removal capability (Fe, Mn, As) makes this a cost-effective and sustainable solution.