Avaliação da adição de nitrato de amônio para redução de odor nos esgotos de Pereira Barreto - SP: reflexos na qualidade da água do reservatório de Três Irmãos, após dez anos de aplicação / Evaluation of the addition of ammonium nitrate to the sewer system in Pereira Barreto - SP, in order to reduce the odor: reflections upon the quality of the water in the Três Irmãos reservoir, aften ten years of application

AUTOR(ES)

Teodosia Basile Liliamtis

DATA DE PUBLICAÇÃO

2007

RESUMO

It evaluates the alteration of the quality of the water in the region of discharges of domestic effluents into the Três Irmãos reservoir, due to the application, since 1996, of ammonium nitrate into the sewer system of the city of Pereira Barreto. Six trips to collect samples were performed bimonthly between October 2004 and August 2005.The samples were collected at six different points: five in the reservoir and one in the Sewage Treatment Plant in Pereira Barreto. In each station of the reservoir, the samples were collected on the surface, at half depth and at the bottom. Water and sewage samples were obtained for analysis of physical, chemical and hydrobiological parameters. In order to better evaluate the quality of water, as well as the quality of the final effluent from the sewage of the Sewage Treatment Plant, the Wilcoxon Signed-rank Test for Paired Data (Nonparametric Test), the Principal Component Analysis and the Hierarchical Cluster Analysis Methods were performed. The results showed that the levels of nitrate-nitrogen in the water and in the final effluent were way below the maximum limit established by CONAMA 357/05 for Class 2 waters (10 mg/L). It was concluded that, environmentally speaking, the addition of ammonium nitrate to reduce the odors in sanitary sewer systems was not potentially significant to cause a negative impact on the reservoir. It was also concluded that the region under study in the reservoir is well oxygenated, even in deeper layers, with low turbidity levels and slightly alkaline pH; however, high electrical conductivity and high concentrations of nutrients (phosphorus and ammonia) were observed, mainly in summer. This is mainly due to the influence of the domestic sewage which is discharged in that area.

ASSUNTO(S)

reservatório de três irmãos qualidade da água ammonium nitrate quality of the water reduction of odor nitrato de amônio três irmãos reservoir redução de odor

Documentos Relacionados

• Análise do assoreamento no reservatório de Três Irmãos - SP, utilizando dados topobatimétricos, hidrológicos e técnicas de geoprocessamento
• Aspectos da contaminação do aquifero livre do Municipio de Pereira Barreto/SP
• Avaliação e quantificação da contribuição de uma voçoroca para o assoreamento do Ribeirão das Cruzes, tributário da represa de Três Irmãos, SP
• A geração de maus odores na rede coletora de esgotos do município de Pereira Barreto: um problema de saúde pública
• O Pico dos Três Irmãos, obra interrompida de Mário de Andrade: pressupostos de uma edição crítica e genética