Preliminary Evaluation of Biological and Physical–Chemical Chromium Removal Mechanisms in Gravel Media Used in Constructed Wetlands

The results show that biotic systems achieved significantly higher chromium removal efficiencies than both abiotic treatments

Gabriela Dotro

2010

Scholarcy highlights

  • Constructed wetlands have been shown to achieve high chromium and organic matter removal efficiencies when treating tannery wastewaters
  • Findings suggested chromium was potentially binding to iron oxides and microbial surfaces on the wetland media
  • The purpose of the present study was to distinguish between physical–chemical and biologically mediated removal mechanisms operating on iron-containing media
  • All systems were operated in 3-day batches, with the biotic and abiotic aerobic systems operating for 11 batches and the abiotic anaerobic operating for five batches
  • The results show that biotic systems achieved significantly higher chromium removal efficiencies than both abiotic treatments
  • Redox conditions were affected by microbial metabolism, favouring iron release from the media surface
  • Chromium removals achieved in sterile reactors illustrate that the media influences metal retention in constructed wetlands; microbial interactions with both the media and tannery effluent achieve overall greater chromium removal than achieved solely by physical–chemical mechanisms

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