Contribuições indevidas de águas pluviais em trecho de rede de esgotamento sanitário afluente à ete mangabeira em João Pessoa-PB

Abstract

Water is one of the most important resources for the maintenance of life on Earth. With the world population growth, the tailings generated also had a considerable growth and this way the need to give them an adequate destination and treatment. The sewage system used in Brazil is the absolute separator, where rainwater is transported in separate conduits from sanitary sewage. However, it is often observed the increase of flow in the sewage network during the rainy season. The present study aims to quantify the participation of rainwater in the flow of part of the sewage network of the city of João Pessoa, more precisely in the affluent network at the Sewage Treatment Station (ETE) in Mangabeira, managed by Companhia de Água e Esgotos da Paraíba (CAGEPA) – Water and Sewage Company of Paraíba. Sewage measurements were made upstream of the ETE every 10 minutes, from 7:00 am to 5:00 p.m., for 3 (three) weeks, one of standard dry weather, one of dry weather and one of rainy weather. Rainfall data were obtained to characterize each week according to the rainfall index during the same period of the sewage measurements. Thereby, the average sewage flow of each week was calculated in order to compare the results. The flow of the dry weather week was 23.66 l/s, in the other hand the sewage flow measured for the rainy weather week was 48, 97 l/s. The increase in flow between dry weather week and rainy weather week was calculated and an increase of 107% was observed, which shows that there is rainwater interference on the sewage system.