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Natércia Matias1, Asbjørn Haaning Nielsen2, Jes Vollertsen2

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This study investigated hydrogen sulfide emission in turbulent sewer conditions. Backdrop drop structures significantly reduce oxygen uptake and hydrogen sulfide release compared to free-fall types.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment
  • Water Quality Management

Background:

  • Understanding the sulfur cycle in sewer systems is crucial for managing hydrogen sulfide emissions.
  • Limited data exists on hydrogen sulfide emission under highly turbulent conditions like drop structures.

Purpose of the Study:

  • To analyze the influence of drop characteristics on reaeration in sewer systems.
  • To establish empirical expressions for oxygen mass transfer in drop structures.
  • To define the relationship between reaeration and hydrogen sulfide release.

Main Methods:

  • Experimental investigation using physical models of sewer drop structures.
  • Performed 125 tests varying drop types, heights, tailwater depths, and flow rates.
  • Applied the two-film theory with two reference substances.

Main Results:

  • Established empirical expressions for oxygen mass transfer based on physical parameters.
  • Quantified air-water mass transfer rates for different drop types.
  • Backdrop drop structures showed considerably lower oxygen uptake rates than free-fall types.

Conclusions:

  • The type of drop structure critically influences oxygen uptake and hydrogen sulfide emission rates.
  • Backdrop structures are more effective in reducing gas transfer compared to free-fall structures.
  • Findings provide insights for designing sewer systems to control hydrogen sulfide emissions.