Caracterização das águas estaurinas na praia da enseada em São Sebastião – SP

Abstract

On the coast of São Paulo, the local residents and fishing communities depend on fishing and local festivities to support their family’s expenses. Preserving water resources is very important, however, the lack of basic sanitation and adequate drainage structures results in the discharge of contaminated effluents and solid waste into water courses, which causes water pollution. In the city of São Sebastião, the rain galleries that cross the city are responsible for collecting the rainwater dispensed in the sea. These galleries should only collect rainwater, but often domestic effluents are discharged into them, due to irregular constructions, or even, the difficulty of the sanitation company to access properties located in rugged relief areas. This Project aimed to check the conditions of the water body that receives water from two rainwater galleries located on Enseada’s beach, in the municipality of São Sebastião, State of São Paulo. The study included the evaluating of Ph’s parameters, its temperature, DQO, total solids, COT, Total Ammoniacal Nitrogen, Nitrite, Nitrate, Total Phosphorus and OD. The results showed that some parameters doesn’t fit with current legislation. In addition, the irregular parameters of nitrogenous compounds and dissolved oxygen are enough to contact recent organic contamination, but not enough for constant water contamination, once the contact of these discharges with seawater dilutes the contaminating load.