Sistema de reuso de águas servidas para fins domésticos não potáveis

Abstract

The main objective of this work was to develop a system for the collection and reuse of wastewater for non-potable domestic purposes. A 75 mm PVC tube filter with 30 cm of activated carbon, dolomite, quartz and special sponges was developed for the purpose of preliminary treatment of wastewater for reuse in domestic activities for non potable purposes. For this, the work was divided in two stages, being the first one to define the system layout and the second one to characterize the experiment. The system layout has collection, storage, treatment and reuse, using domestic effluents from wastewater washing machines. The total dissolved solids, pH, turbidity and fecal coliform parameters were analyzed, based on the Brazilian Regulatory Standard -13.969 / 97, which deals with septic tanks: complementary treatment units and final disposal of liquid effluents. The results obtained showed that the dissolved solid parameters of the raw water are in use classes II, III and IV, and after passing through the filter, it is classified in class I. The turbidity was the parameter that did not meet the standard values, where it varied between 40 and 160 NTU, when the reference value must be below 10 NTU defined by the NBR, thus fitting for predicted uses of class IV, negative factor for the experiment, requiring auxiliary systems to remove turbidity. The results obtained were not taken into account for the parameter of turbidity, but included the other parameters within the reference values, addressing the question of the efficiency of the use of activated carbon for wastewater treatment, since this presented in deficit with the reduction of turbidity in the water, being explained by the great presence of chemical products, where an aerobic reactor can be used to correct the turbidity in the treated effluent.