Estudo de viabilidade econômica da implantação de um sistema de captação e reutilização de águas pluviais de uma instituição de ensino na cidade Alegrete-RS

Abstract

The present research had the purpose of evaluating the implantation of a system of capture and reuse of rainwater for non potable purposes in a Teaching Institution of the Municipality of Alegrete-RS. For this, some methods were developed that allowed to analyze the technical and economic viability of this system, making a calculation on the expenses for the installation of the same, as well as the economy generated with the passage of time. Analyzing the rainfall data of the region and calculating the demand for drinking water and possible non-potable water demand for non-noble purposes in three blocks of the institution, in addition to the definition of the area of rainwater collection, of the reservoirs, through the methodologies established in ABNT NBR 15527, destined to the storage of collected rainwater. With an estimated demand of 102.57 m³ to meet the buildings studied, it was necessary to install 131,07 m³ of water reserve. In calculating all the necessary expenses for the implantation of the rainwater harvesting system, it reached an amount of R $ 54,540.05, with a return period of capital investment of just over 6 years. The results indicate that the rainwater harvesting by the institution provides a significant saving, which is around R $ 906.72 per month for the first year, allowing the reduction of expenses with drinking water, besides being an interesting alternative in terms of environmental gains for the future generations.

Keywords: reuse of rainwater, technical and economic viability, rainwater harvesting system.