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Iron bacterias use elements such as iron, through oxidation and reduction processes. As a product, the ochre: a gelatinous slime material, rich in iron, with adhesive properties. The crystallization make this slime a problem for civil engineering, once it fills and obstructs drainage systems. This study proposes the analyze of the interference of iron bacteria in geotechnical works in the State of Ceara, through the correlation among the ideal conditions to their development, mapping regions with the presence of mineral iron in their subsoil, as well as water quality parameters of dams reservoirs. It was observed that all the reservoirs indicated an ideal environment for the growth of iron bacterias, including the Jaburu I Dam, where a sediment sample was also collected for tests, revealing the presence of ochre.
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