Summary: Thiobacilli were estimated in samples taken from the Hamburg sewer system at six sites showing different degrees of concrete corrosion. There was a marked enrichment of thiobacilli on the sewer pipe surface above the sewage level in comparison to the liquid phase. The highest number [10 thiobacilli (mg protein)] was found at the site of the greatest corrosion. Ten isolates of the genus were characterized and identified as and Facultative chemolithotrophic bacteria predominated at sites of early corrosion, whereas was most abundant in severely corroded areas. The cell number of could be greatly decreased by aerating the sewage with pure oxygen.


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