Concrete corrosion in the Hamburg Sewer system

Abstract

In the sewer network of Hamburg extensive biogenic H2SO4 corrosion was noted. A field study indicated Thiobacillus neapolitanus, T. intermedius, T. novellus and T. thiooxidans. A positive correlation between the cell numbers of T. thiooxidans and the grade of corrosion was noted. As sources of S, the volatile compounds H2S sulfite, methylmercaptane, dimethylsulfide and dithiabutane, were possible. Biogenic concrete corrosion was simulated in a strictly controlled H2S breeding chamber. Differences among various concrete types were demonstrated.