Avaliação econômica comparativa da estação de tratamento de água de Maranguape tratando água de dois distintos mananciais: Açudes Acarape do Meio e Gavião

Abstract

Because of the significant increase in enviromental pollution that happened in the last decades, the artificial eutrophication has received a bigger attention of cientific comunity and concessionaires sanitation. Because of this problem there was a considerable elevation in the water treatment costs to conform to the standards required by the Portária do Ministério da Saúde (2914/2011). This work showed, evaluated and compered, between january of 2010 and december of 2012, the cost of water production in the Estação de Tratamento de Água (ETA) that supplies Maranguape city, considering the catchment in the Gavião and Acarape do Meio weirs. In this context, sought to understand the process through analysis of gross water costs, eletric energy, chemicals, operation and loss of water in the wash filters. The reserch shows that the average cost of water production at the exit of the ETA is R$ 0,26/m³ using as supply fountainhead the Acarape do Meio weir and R$ 0,44/m³ when used the Gavião weir. It was noted that these costs are strongly influenced by the rates of gross water, being the cost of water that came from Gavião weir three times bigger than the water of Acarape do Meio weir. It was noted that, despite having a lower quality, what influences in the washing losses and increased consumption of chemicals, the water of Acarape do Meio weir allows an average reduction of 66% of the production costs of treated water when compared with the months in which the ETA Maranguape is fueled by the Gavião weir.