Hydrogen Sulphide in Industrial Enter-prises Water Management Infrastruc-ture - The Factor of Chemical and Microbiological Corrosion Concrete Degradation of Water Facilities

Abstract

The durability of concrete, the material which is widely used for water facilities depends on accumulation in operational environments (drain water, air-gas space) of hydrogen sulfide. Now the mechanism of corrosion destruction of concrete in drainage pipelines is represented as result of biogenous sulphuric acid aggression – influence of the sulphuric acid formed by thionic bacteria. The analysis of data on H 2 S concentration in drain waters of various industrial enterprises demonstrates that they create in gaseous operational media H 2 S concentration, sufficient for development in aerobic conditions of thionic bacteria. As the results of urban sewer networks inspection have shown, the correlation between concentration of H 2 S in aqueous phase and its concentration in air environment, between concentration of H 2 S in air environment and the corrosion rate of concrete’s coffering part is observed. Chemical and X-ray crystallography of this concrete showed that in corrosive concrete decreases pH, reaching in some examples of values 1-2, and sulfates collect. In dynamics of corrosion process the exponential growth of concentration in concrete of extremely acidophilic thionic bacteria is noted.