Evaluation of Sanitary Sewer Sulfide, Odor, and Corrosion Potential

The Environmental Protection Agency sulfide and corrosion models can be used to evaluate sulfide related odor and corrosion potentials in sanitary sewers and structures. The models take into account the in-line biologic processes; sewer hydraulics; sewage characteristics; localized turbulence; and the sewer pipe physical characteristics to determine hydrogen sulfide odor potential; corrosion potential; corrosion rates; or the degree of corrosion protection required for a particular gravity sanitary sewer or sewer structure. The model has proved equally valuable in predicting sewer failure locations before the failure occurs. The model may be used to evaluate the corrosion potential of a proposed interceptor sewer system prior to final design. Based on the corrosion and odor potential predicted by the models, appropriate pipe sulfide corrosion protection can be selected based on predicted risk, costs associated with potential failure, and costs of corrosion protection, for various alternative alignments and system configurations. The use of the models to evaluate design alternatives for new sewers, identify potential odor and corrosion problem areas, and evaluate the life expectancy of existing unlined concrete sewers is discussed. The model corrosion data are an important but often ignored component in sewer condition evaluation. Using the corrosion rate information, it is possible to prioritize and budget sewer rehabilitation needs on a more realistic basis than has been used in the past. Some of the past methods have resulted in multi-million dollar rehabilitation projects on sewers with a calculated remaining life expectancy of 50 years or more. In other cases, pipe failure has occurred ten or fifteen years after installation due to a lack of understanding of the sulfide corrosion process.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: References; Tables;
  • Pagination: 17p
  • Monograph Title: Pipeline Engineering and Construction: What's on the Horizon? Proceedings of the Pipelines 2004 International Conference, August 1-4, 2004, San Diego, California

Subject/Index Terms

Filing Info

  • Accession Number: 01003292
  • Record Type: Publication
  • ISBN: 0784407452
  • Files: TRIS
  • Created Date: Aug 17 2005 3:51PM