Análise de viabilidade econômica entre sistemas centralizados e descentralizados : estudo de caso do bairro Jabotiana – SE

Abstract

Sewage treatments systems have an important role in maintenace of the population health and well-being, besides help the environmental preservation. Currently, the district of Jabotiana, localized in the urban area of Aracaju/SE, still has deficiency in its system of collect and sewage treatments. In view of this reality, a decentralized sewage treatment system was estimated to serve the entire population of this neighborhood. The project consists in the implantation of septic tanks as primary treatment, followed by horizontal subsurface flow wetlands as secondary treatment and finally the disposal of treated sewage must be done in the nearest river. According to estimates, a total of 109 decentralized treatment units were found that are capable of serving the sewage generation of 43.367 habitants. In addition to this solution, it was also checked that the local water concessionaire, DESO, has a project to the implementation of a centralized treatment station that aims to serve the whole neighborhood and adjacent areas. Then, it was considered the same number of population to be contemplated and calculations were made to estimate the cost of implementing this system with the goal of comparing the final values of the two types of proposed solutions. From the final values found that were R$15.422.223,43 for the implementation and maintenance of the decentralized system and R$14.546.136,70 for the centralized system, so can be inferred that the first solution is economically viable.