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