TAVARES, J. L.; http://lattes.cnpq.br/5264177368997967; TAVARES, Jean Leite.
Résumé:
This work aimed the evaluation of sanitary aspects of water quality in the
horizontal and vertical compartments of Sao Salvador reservoir, located in the municipal
district of Sape (7°06'S; 35°14'5"W) state of Paralba and inserted in the micro region of the
Agreste. Also compared this data with the existent in the order to evaluate the evolution of
the dam trophic state, in three different climatic times. The analyzed data comprised the
period of January of 1996 to July of 1998, inserted in different climatic times according to
the precipitations. The periods were divided in three rainy season (Rain 1, Rain 2 and Rain
3) and two dry seasons (Dry 1 and Dry 2). The 7 points studied in the horizontal
compartments (4 in the margins and 3 in the center of the dams) were analyzed in the
Rain 1 (C1), Dry 1 (S1) and Dry 2 (S2). A grouping analysis using the software SPSS 8.0
for Windows was carried out to accompany the progress of eutrophication in the horizontal
compartments. The results showed an alternative of water quality in those points near the
entrance of the main tributary, the Sao Salvador stream, belonging to the Inferior Basin of
the Paralba river which receives the influence of the final effluent of the Sape Wastewater
Treatment Plant, with low efficiency for the removal of pathogens, organic material and
suspend solids, contributing to tie dam water quality deterioration. Two indexes for trophic
classification were used: modified Carlson index, which classified the dam as eutrophic in
the dry season and as eu-hipereutrophic in the rainy season and the adapted Carlson
index, which classified the dam as meso-eutrophic in the dry season and as eutrophic in
the rainy season. It was also used the classification proposed by OECD (which uses limits
values for the trophic classification) and this dam was considered as meso-eutrophic in
the Dry Season 1 and went to eutrophic in Rain 1 reaching hipereutrophic level in the Dry
Season 2. According to the CONAMA 20/86 classification the dam water Class 3 being
suitable for human consumption after conventional treatment. These waters were
classified as inappropriate for bathing due to the several human activities developed in the
margins. The study of the submerged macrophyte Elodea canadensis in the deterioration
of water quality in RS6 while in RS1, presented the best water quality because was better
protected from the polluted pulses originated from of the margins.
