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Proteção de comunidade aquática em efluente tratado por tanques de estabilização de resíduos no rio São Lourenço em São Lourenço da Serra Vale do Ribeira – Estado de São Paulo

2008; Volume: 32; Issue: 3 Linguagem: Inglês

10.15343/0104-7809.2008323308316

1980-3990

Silvana Audrá Cutolo, Roque Passos Piveli, Alexandre Alves de Oliveira, Lícia Natal Fernandes, Elisabeth Mendes Martins Moura, Francisca Alzira dos Santos Peternella, Maria Aparecida Faustino Pires,

Water Quality and Pollution Assessment

The treatment of sewer pipes of small cities using waste stabilization ponds is a simple, efficient, and low cost option. Sewer pipes area fountain of water and ground contamination and consequently they contribute to diseases transmission, besides being a threat to the preservationof the environment. It is thus necessary to investigate the conditions of effluents going to water courses. The present work aims to carryout an investigation on the quality of residual waters treated by stabilization ponds of a sewer pipe treatment facility located in Sao Lourencoda Serra, Vale do Ribeira, State Sao Paulo and examine the sanitary risks and the local aquatic community. Samples were taken for evaluating theseveral anaerobic and facultative ponds of sewer pipe of the treatment facility of Sao Lourenco da Serra. Parameters used were pH, air and watertemperature, climatic conditions, biochemical demand of oxygen and ammoniac nitrogen, thermo-tolerant bacteria, photosynthetic pigments andzooplanktonic community. We observed that the anaerobic and optional pond systems were efficient in the production of effluent and presentedvalues in accordance with the Resolution Conama no 357, which establish limits for waste disposal in water sources. Sao Lourenco River is located inan area of environmental protection, and data were compared to limits established in Class 1 and 2 and demonstrate a process of euthrophization,putting in risk aquatic biodiversity and the health of the population.