[Dynamics of successive changes in sulphidogenic microbial association under the conditions of formation of the biofilm on steel surface].

Dynamics of successive changes in the artificial associative culture of sulphate-reducing bacteria was investigated under biofilm formation on steel 3 specimens. It was shown that the ammonificating, denitrificating and iron-reducing bacteria were associative satellites of sulphate-reducing bacteria in the biofilm. Heterotrophic satellites ofsulphate-reductors with domination ofammonificating bacteria developed in the first hours of exposition in the microbial association. The appearance of sulphate-reducing bacteria in the biofilm was fixed on the 24th hour of exposition, their domination was noticed after 72 and 240 hours. It was shown that the successive changes with a consequent change of domination of different bacterial physiologic groups took place in the microbial association under the biofilm formation on the steel surface, that favoured mutually beneficial functioning of corrosion-dangerous bacteria.