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Biological chromium(VI) reduction using a trickling filter.

E Dermou1, A Velissariou, D Xenos

  • 1Department of Environmental and Natural Resources Management, University of Ioannina, Seferi 2, 30100 Agrinio, Greece.

Journal of Hazardous Materials
|August 2, 2005
PubMed
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This study demonstrates a pilot-scale trickling filter effectively removes hexavalent chromium (Cr(VI)) from industrial wastewater using indigenous bacteria. The SBR with recirculation mode achieved high removal rates, offering a cost-effective environmental solution.

Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • Industrial wastewater often contains toxic hexavalent chromium (Cr(VI)).
  • Biological treatment methods are sought for effective and sustainable chromium removal.
  • Existing methods may have limitations in efficiency or cost.

Purpose of the Study:

  • To evaluate a pilot-scale trickling filter for biological Cr(VI) removal.
  • To identify optimal operating conditions for chromium reduction.
  • To assess the feasibility of this technology for industrial applications.

Main Methods:

  • Construction and operation of a pilot-scale trickling filter.
  • Enrichment of indigenous bacteria from industrial sludge for inoculum.

Related Experiment Videos

  • Testing of batch, continuous, and SBR with recirculation operating modes.
  • Use of sodium acetate as a carbon source, with concentration effects studied.

    • Main Results:

    • Sodium acetate inhibited chromate reduction at high concentrations.
    • The SBR with recirculation mode achieved high removal rates (up to 530 g Cr(VI)/m2 d).
    • Natural aeration was sufficient, eliminating the need for external mechanical aeration.

    Conclusions:

    • The trickling filter, particularly in SBR with recirculation mode, is highly effective for biological Cr(VI) removal.
    • The technology offers low operating costs and high reduction rates.
    • This biological treatment presents a feasible solution for industrial hexavalent chromium contamination.