How H₂S Corrodes Concrete Sewer Infrastructure
Hydrogen sulfide in the headspace of a wet well is oxidized by Thiobacillus bacteria into sulfuric acid, which then attacks the concrete crown. Untreated wet wells lose ¼ inch of wall per year.
How to know if you have it
Look for white crystalline efflorescence at the waterline and a chalky, soft surface above it. Cores tested by a structural engineer confirm depth of attack.
Coating versus treatment
Calcium aluminate coatings buy time but the acid will eventually find a defect. Continuous H₂S treatment at the source prevents formation.
Frequently asked questions
- Can I repair without taking the station offline?
- Pump-around setups allow recoating without shutdown but add significant cost.
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