ESTUDO DA VIABILIDADE DO APROVEITAMENTO DE ÁGUA DE CHUVA E DO REÚSO DE ÁGUAS CINZAS EM UM EDIFÍCIO RESIDENCIAL MULTIFAMILIAR NO MUNICÍPIO DE ALFENAS

Abstract

The present work presents a case study in a multifamily residential building in the city of Alfenas, MG, where it was analyzed the use of rainwater and gray water in the following places: in sanitary basins, car wash, floor washing and irrigation garden. These locations do not require drinking water. First, a research was conducted on norms, books, websites and other academic works, in order to acquire the theoretical concepts to develop this project. Through this research it was possible to estimate the existing variables in the development of the project, such as the population estimate of the building, as it is under construction, and also the water demands of the building were estimated. The design of systems for the utilization of rainwater (SAAP) and reuse of waters was done in order to know the costs of the projects. For SAAP, the return time is around 6 years for Case 2 and 11 years for Case 3, and it was perceived that it would be impracticable from an economic point of view, on the other hand, it contributes to the preservation of water. For the reuse of gray water the collection was carried out by pipelines installed in the places of use where the treatment is less complex, such as washing machine, tank, shower and lavatory, with which a gray water treatment plant was chosen (ETAC). The return time for reuse is approximately 3 years and is fully economically feasible. It was also proposed in this work a mixed system with the SAAP junction and reuse, and it was verified that it would also be economically viable due to its return time being approximately 3 years and a half.