Importance of hydrogen sulfide, thiosulfate, and methylmercaptan for growth of thiobacilli during simulation of concrete corrosion.

In: Applied and Environmental Microbiology (Appl.Environ.Microbiol.), Jg. 53 (1987) ; Nr. 7, S. 1645-1648
ISSN: 0099-2240
Zeitschriftenaufsatz / Fach: Chemie
Biogenic H2SO4 corrosion of concrete surfaces caused by thiobacilli was reproduced in simulation expts. At 9 mo after inoculation with thiobacilli, concrete blocks were severely corroded. The S compds. H2S, S2O32-, and MeSH were tested for their corrosive action. With H2S, severe corrosion was noted. The flora was dominated by Thiobacillus thioxidans. S2O32- led to medium corrosion and a dominance of Thiobacillus neapolitanus and Thiobacillus intermedium. MeSH resulted in negligible corrosion. A flora of heterotrophs and fungi grew on the blocks. This result implies that MeSH cannot be degraded by thiobacilli.