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Water is a renewable and limited resource, however its potability is an essential factor, since the increase of population in a disorderly way linked to the indiscriminate use of such a resource has posed a threat to the quality of it. In order to find simple, sustainable and low-cost solutions, several countries, such as the United States, Japan and some European countries, have been studying viable ways to treat different types of effluents, especially the domestic ones, gaining visibility for gray water reuse. This work was realized in the United States, Macon - GA, and aimed to create two groups of intermittent sand filters in order to analyze their efficiency in the treatment of synthetic gray water, evaluating the chemical parameters of BOD and COD, and from the results verify the feasibility for non-potable urban reuse and encouraging, through the results, a promising type of study to be carried out in Brazil. The study presented satisfactory results regarding the analyzed chemical aspects, acting in the reduction of BOD and COD with efficiency above 90% for group 1 and above 80% for group 2, besides having effluent filters with mean values of BOD accordance with the legislation envisaged by the USEPA.

Reuso de águas cinzas: estudo de caso da eficiência de dois tipos de filtros intermitentes de areia no tratamento de água cinza sintética