Impactos técnicos e econômicos da redução da contribuição de esgoto sanitário no dimensionamento da rede coletora de esgoto

Abstract

The reuse of water has been gaining prominence as an alternative solution to the problem of the global water crisis. This technique utilizes sewage effluents, with or without treatment, depending on the intended purpose. This technique is already used in several places in the world. Brazil is in an alarming scenario regarding the availability of water resources, presenting favorable conditions for the implementation of water reuse in the residences. Therefore, a factor of relevant importance is to analyze how the reduction in the generation of domestic effluents is capable of impacting the sewerage system. Thus, the present work had the objective to develop a comparative study about the sewage system of a given study area, analyzing the size and budget of the collection network closest to the real situation and varying the percentage of reuse, considering the situation more reallty and the variation of minimum constructive slope and per capita consumption. The results indicate that the consideration of water reuse tends to decrease the pipe diameter, but there was no significant difference in the total cost of the sewage system implantation, considering pipe, excavation and landfill. The economic issue is very important, but should not be the decisive factor to take a decision when the issue is the preservation of water resources.