Análise do potencial de redução do consumo de água potável pelo aproveitamento de águas pluviais e reúso de águas cinzas na Rodoviária do Plano Piloto de Brasília - DF

Abstract

The aim of this work was to characterize water-uses at Plano Piloto Bus Station in Brasília and with this, this study carried out a comparative analysis of potable water reductions for rainwater harvesting and greywater reuse systems using different non-potable water use scenarios. The development of this study was divided in two stages: i) data collection of consumption; and ii) evaluation of the potential water reductions through the use of rainwater and greywater reuse. Results showed that about 80% of annual water consumption comes from floor washing and toilet and urinal flushing (3,229 m³). Based on the data collected on frequency of water use and average flow rate of equipment, it was possible to generate water end-use indicators for bathroom sink faucets (0.18 l/p/d), toilets (0.54 l/p/d), urinals (0.13 l/p/d) floor-washing (0.41 l/m²/d) and bathroom-washing (0.05 l/m²/d). Based on the data collected, it was possible to estimate the potential water reductions by the use of rainwater and the reuse of greywater for floor-washing (Scenario 1), toilet/urinal flushing (Scenario 2) and for both floor-washing and toilet/urinal flushing (Scenario 3). In general, rainwater harvesting systems promoted greater reductions in potable water consumption, varying from 601 to 3,229 m3 / year.