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Keywords:

  • Bioreactor;
  • Deodorization;
  • Hydrogen sulfide;
  • Odorous emissions

Abstract

A study was performed in two submerged, pilot-scale biofilm bioreactors operated under different conditions to determine the relationship between the operating parameters and H2S emission. H2S was always detected in the exhaust air at concentrations varying from 1 to 353 ppmv. The specific aeration rate was the most influencing parameter, with As < 30 equation image kg CODmath image (dissolved oxygen concentrations <4 mg L−1) increasing noticeably the H2S production. The periodical removal of the accumulated sludge reduced H2S emissions by ∼14%.