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The electrocoagulation of aqueous matrices has been gaining considerable attention because of the versatility and good results obtained. The treatability of rainwater was evaluated by means of electrocoagulation/flotation in cylindrical reactor with aluminium electrodes. The experimental procedure was conducted in pilot-scale reactor, operated in continuous flow with hydraulic detention time of 100 seconds and 12.3 current density mA/cm2. The reactor was built with acrylic tube on the dimensions of 8 cm in diameter and 60 cm in height, being the electrodes made with aluminum tube with 15 cm high. To assess the degree of treatability of rainwater were carried out analyses of pH, turbidity, color, chlorides, silica, hardness, alkalinity, conductivity, suspended solids and dissolved and chemical oxygen demand. The results were compared ABNT NBR 15527, Portaria 2914 and the ASME standard for boiler water, being that with the exception of the hardness, the other answered. These results showed the cost benefit of electrocoagulation/flotation, which showed spending U$ 1.12 per cubic meter of treated water.

APPLICATION OF ELETROCOAGULATION / FLOTATION PROCESS FOR RAINWATER REUSE