Análise técnica e financeira de um sistema de aproveitamento de águas pluviais para uma unidade residencial multifamiliar

Abstract

Considering the increasing environmental problem of water and factors of increase in consumption, we study the use of rainwater as a substitute for the use of non-potable water. In order to minimize the environmental impacts caused by the misuse or neglect of this resource and decrease the use of drinking water for less noble purposes. Therefore, it is necessary to evaluate if the system is technically and financially feasible for the situation of the object of study, without distorting the positive aspects of the rainwater reuse system. An analysis of the project was carried out in a multi-family residential building in the city of Maceió, Alagoas. In view of this, we verified the characteristics of the project, such as the region's rainfall regime, the size of the building, estimates of daily demand, and based on technical standards, the reuse system is dimensioned. The Neptune 4 program, which uses the simulation method, was used for the design of the reservoirs, and for gutters and conductors followed the recommendations of norm 10844/89. The financial analysis for the verification of the investment is done through the Payback method, and indicated that the investment reached a high return time, which may not be attractive as a financial investment, but could still be adopted. Although the reduction in supply demand, there can still be a positive outcome of the project, in addition to bringing a contribution to the discussions and questioning of this matter.