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biogenic sulfide corrosion
Biogenic sulfide corrosion is a bacterially mediated process of forming hydrogen sulfide gas and the subsequent conversion to sulfuric acid that attacks concrete and steel within wastewater environments. The hydrogen sulfide gas is biochemically oxidized in the presence of moisture to form sulfuric acid. The effect of sulfuric acid on concrete and steel surfaces exposed to severe wastewater environments can be devastating.〔O’Dea, Vaughn, “Understanding Biogenic Sulfide Corrosion,”MP (November 2007), pp. 36-39.〕 In the USA alone, corrosion is causing sewer asset losses estimated at
around $14 billion per year.〔Brongers et al., 2002〕 This cost is expected to increase as the aging infrastructure continues to fail.〔Sydney et al., 1996; US EPA, 1991〕
==Environment==
Corrosion may occur where stale sewage generates hydrogen sulfide gas into an atmosphere containing oxygen gas and high relative humidity. There must be an underlying anaerobic aquatic habitat containing sulfates and an overlying aerobic aquatic habitat separated by a gas phase containing both oxygen and hydrogen sulfide at concentrations in excess of 2 ppm.〔Sawyer&McCarty p.461&462〕
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