Caustic Spray for Sewer Crown Corrosion Control

by Jaime Badia,
Ching-Lin Chen,
Edward Esfandi,
William Kimbell,

Document Type: Proceeding Paper

Part of: Pipeline Infrastructure II


A novel method to control sewer crown corrosion which involves spray application of a caustic solution to the sewer crown is described. Corrosion control using this concept is based on raising the sewer crown pH, thereby, neutralizing the sulfuric acid formed by the Thiobacillus thiooxidans, inactivating and possibly destroying these bacteria, and limiting the formation of new colonies. An experimental system to apply the caustic solution was designed, built, and put into operation in June 1989. Currently, the Districts continue to use this system for both research and control of sulfide corrosion in selected sewers. A description of the caustic spray process is provided.

Subject Headings: Sewers | Corrosion | Concrete pipes | Bacteria | pH | Sulfur | Sulfides

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