Sistema de reuso de águas cinzas para fins não potáveis: viabilidade econômica e aceitação social

Abstract

The rational use of water has become a growing response, given the current situation, to the water crisis. Within the various options for reuse, there is that of gray water, water that is not contaminated by feces or urine, and which, after proper treatment, can be used for various purposes, including non-potable domestic reuse. In this work, a case study of a residence will be presented, with verification of the implementation costs of the greywater reuse system, which involves a septic tank, a filtration ditch, two reservoirs and a pump, and an acceptance survey of a community sample, carried out via google forms, for residents of the city of João Pessoa, regarding gray water reuse. The greywater reuse system proved to be economically viable, with a benefit/cost ratio of 1.06. In addition, another fundamental factor of the study was the population's interest in investing in this system if economically viable, which was demonstrated by the positive response of 94% of the sample. Another relevant parameter was people's lack of knowledge regarding the correct treatment for the reuse of gray water, not performing the procedures, or performing them improperly, which can lead to various risks.