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DETERIORATION OF CONCRETE MATERIAL AFFECTED BY MICROORGANISMS LIVING IN THE WASTE WATER
Abstract
Concrete and mortar made with Portland cement can be damaged when exposed to solutions containing sulphate. Waste water ofte n contains sulphuric bacteria, and so the piping is frequently damage due to sulphate attack. In case of concrete sewer pipes this phenomenon is caused mainly by the sulphur-o xidising and sulphate-reducing bacteria that are forming part of the biological circulation of sulphur and its compounds in biosphere. These bacteria take part in the dissimilatory part of this cycle and the bacterial population of this reduced cycle is called sulphuretum. This paper presents the results of the inve stigation of sulphate attack on concrete samples caused by Acidithiobacillus thiooxidans as sulphur-oxidising and Desulfovibrio desulfuricans as sulphate-reducing bacteria. The expe riments proceeded during 80 days in laboratory under stationary model conditions. The selected deterioration ch aracteristics of concrete samples were measured after bacteria exposition. The releasing of Si and Ca compounds from cement matrix was observed during experiment. The concentrations of ions in leachates with immersed concrete samples were measured by atomic absorption spectrometry. The increasing of concentrations from zero concentration to 34.52 mg/l was measured for Si ions and from 27.26 mg/l to 151.5 mg/l for Ca ions. The pH changes of leachetes were also studied during experiment. The more significant biodeterioration effect was observed in case of sulphur-oxidising bacteria in comp arison to the sulpha te-reducing bacteria exposition.
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