Viabilidade técnica e econômica ao aproveitar água da chuva para fins não potáveis em edificação pública

Abstract

The rainwater collection and storage for using in non-potable purposes generates not only economic benefits, in the reduction of treated water costs, but mainly benefits the environment. This use reduces the use of potable water in flushing toilets, washing cars and floors, reducing the withdrawal of this water from water bodies in the region and making a more rational consumption. This study aimed to evaluate the technical and economic feasibility of using rainwater for non-potable purposes, in a public building in Alegrete/RS county. To this end, inspections were done in the building and the Simulation method was applied at daily intervals for sizing the reservoir for different catchment area scenarios and demands attended. All of the system structures dimensioning was carried out and the value for the implementation of each scenario was estimated. With the non-potable water demand data, the simulation results and the current monetary expenditure with treated water from the concessionaire, the amount that could be saved per month with the implementation of the system for the analyzed scenarios was evaluated. Finally, the system costs were compared with the saved value, in order to choose the scenario that presents the best solution. The result pointed to Scenario 03 as a proposal of greater technical and economic viability, since it presented the shortest return on the initial investment for the implementation of the system. Keywords: Rainwater, Non-potable use, Rational consumption.