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Printer Friendly VersionSelected Information - Completed Research

CP408  Septicity in Rising Mains and H2S Corrosion in Sewers Sewerage
Project Appreciation and Objectives

Dosing chemicals to control septicity in sewers costs Sewerage Undertakers considerable sums of money. But a failure to control septicity results in: erosion and ultimately very expensive collapse of the sewer network; health and safety restriction from high concentrations of H2S and odour complaints where H2S is emitted to the atmosphere.

The objective of this project is to provide Sewerage Undertakers with cost effective options to control septicity in sewers and sewer corrosion.

A thorough understanding of the factors that lead to a build-up of septicity in sewage and the mechanisms of chemical erosion is being developed and the options for mitigation being identified. These will be used to derive a decision model for determining the most cost effective solutions for the range of situations found in sewerage systems.

The project is drawing from existing information and will identify if further investigations would be cost-beneficial.

Benefits to Clients

  • Optimise costs associated with control of septicity.
  • Improve management of septicity in sewers.
  • Reduce corrosion and odour complaints resulting from septicity.

Work Programme

  1. Literature/knowledge review based on initial root-cause analysis of septicity generation and sewer corrosion by H2S attack.
  2. Feasibility review of solutions in terms of practicality, chance of success, estimated costs and how to categorise effectiveness.
  3. Develop decision model for determining the most cost effective option for dealing with septicity and sewer corrosion under different situations.
  4. Gap analysis.
  5. Validation/demonstration of decision model.

Project Output

  • Comprehensive list of options for controlling septicity and corrosion, with practicalities and costs assessed.
  • A decision model for determining the most cost effective options for the control of septicity in sewers and corrosion by H2S attack.
  • Report containing the findings of the project and dissemination workshop.

Related WRc Work

  • Use of Additives to Control Odour in Wastewater Treatment Processes, CP260. 2006
  • Odour Control in Rising Mains, CP017, 2006
  • Proactive Low Cost Monitoring for Sewer Cleaning, CP258, 2007
  • Rising Mains Guidance Manual, CP284, 2006
  • Odour Development in Rising Mains, Portfolio, 2000

WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

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