Estudo da aplicação de um sistema de aproveitamento de águas pluviais para fins não potáveis em prédios da Unipampa – campus Alegrete (RS)

Abstract

The problem of water scarcity is an issue that has been much discussed today. The biggest challenge is to meet the growing demand for water while preserving this resource. The use of rainwater is an alternative that provides a reduction in demand for potable water, minimizing problems related to availability of water resources. Within this context, this study aimed to examine the feasibility of using rainwater for nonpotable purposes at the Federal University of Pampa - Campus Alegrete (RS) through its collection and storage reservoirs. Additionally, this study sought to evaluate the economic potential generated by replacing the drinking water, the use of rainwater for non-potable purposes, such as discharges from toilets and cleaning the campus. For the research, three blocks were chosen from the University, the Academic Block 1, Block 2 Academic and Administrative Block, who already have the entire structure installed for the use of rainwater in the discharges of sanitary basins and urinals. The need to install new reservoirs was evaluated, to meet all the demands of non-potable University. For this, data concerning the provision of rain in Alegrete/RS, which presented itself as a region where rainfall is well distributed, with average monthly rainfall of 125 mm were collected. It has also raised the annual water consumption at the University, with near 200 m³/month values. Soon after, the estimation of nonpotable water demands, corresponding to 150 m³/month was performed. With all the data, the sizing of the storage tank, which resulted in 95 m³ was performed. Then suggestions were proposed for proper installation of new reservoirs, the adequacy of the existing Campus. Finally, the economic analysis of investment, which proved quite feasible, since the reservoir showed a cost of approximately R$ 27.200,00, resulting in a payback period of only 1 year and 1 month was performed. In addition, with the installation of the system on a monthly basis would be saved, spent on drinking water, R$ 1.490,00, equivalent to a reduction of 76%.