Аннотация
The township of Nova Olinda, south of Ceara is supplied with waters from
four deep wells exploiting a confined sandstone aquifer. Calcite and
gypsum rock outcrop and are being exploited commercially in the
watershed where three of the wells are located. Since 2006, public
supply pipelines are damaged due to a sheet-like precipitation causing
frequent obstruction of the pipes. In this investigation we used
chemical analyses, physical chemistry, X-ray analyses and determination
of the calcite saturation index - CSI for studying possible causes for
the deposits identified, basically, as calcite. Calcium concentrations
and CSIs indicate that the water disinfection process adopted increases
the tendency of calcite precipitation due to calcium contained in the
chemicals used.
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