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This research investigated how sulfate-reducing bacteria (SRB)influences the mineralogy of iron-corrosion scales. Microbiologicalactivity in the distribution system is well known and recognized as apotential health-related concern. The effect of bacteria on corrosionhas also been studied, however, the extent to which SRB actuallyaffect corrosion and degradation of distribution system material inreal distribution systems had not been well documented.Iron-corrosion scales were collected from a surface watersystem and a groundwater system, each with relatively highsulfate concentrations. Results showed that reduced sulfur was asignificant component of all scales studied. Elemental sulfur andiron disulfide dominated sulfur species in all of the analyzedscales. Other important iron minerals found were goethite andlepidocrocite. However, magnetite, considered an importantmineral in protecting iron pipes from extensive corrosion and ironrelease, was present only in the iron scales collected from thesurface water system.The article highlights the degree to which microbiologicallyinduced corrosion affects pipe material degradation and corrosionscale buildup, which in turn affects the hydraulics of the distributionsystem, material replacement, and other operating parameters.An understanding of these issues and an awareness of theconditions that favor microbiological corrosion of iron pipe willhelp water providers determine any measures needed to improvetheir distribution system maintenance programs and preservewater quality. Includes 37 references, 5 tables, 4 figures.

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Edition: Vol. 97 - No. 10 Published: 10/01/2005 Number of Pages: 12File Size: 1 file , 340 KB