A evolução da qualidade das águas do rio Paraíba do Sul / The evolution of water quality in the Paraiba do Sul River

AUTOR(ES)

Denise Mecunhe Rosa

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

03/10/2012

RESUMO

There are a number of uses that involve the water consumption that are direct consequences of the industrialization and urbanization intensive process, as well as population growth. The sewage treatment plants serve as environmental barriers increasing the multiple uses of water. This improvement in water quality reduces the risk of spreading diseases to the public that are served by these waters. To contribute with a better view of the subject, it is proposed to analyze the evolution of water quality within 30 years in the flow of the Paraiba do Sul River, considering the impact of population growth and the effects arising from the implementation of sewage treatment plants in the extension of the river. The selected parameters to be analyzed were dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, phosphorus and nitrogen series, besides the water quality index (IQA), the water quality for public supply index (IAP), the water quality for protection of aquatic life and communities index (IVA) and trophic state index (IET), obtained in the Inland Waters Quality of São Paulo State Report, published annually by CETESB. The results indicate that reducing the inflow of untreated sewage waters, when prioritizing the stretches where the impact reaches higher amplitude associated with the morphology of the river, the recovery of water quality in terms of BOD, COD and OD, reaches greater extension. In terms of nutrients, such as nitrogen and phosphorus, it is necessary to adopt measures to reduce them at source

ASSUNTO(S)

crescimento populacional estação de tratamento de esgoto population growth qualidade das Águas sewage treatment plant water quality

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