Filtragem de água da chuva por argamassa de cimento com lignina e carvão ativado

Abstract

The lack of actions to avoid the shortening of water resources for human use, discussed since the 90’s decade of 20th century, has now become a catastrophic reality in the great urban centers of Brazil. There is an urgent need for alternatives to the conscious use of freshwater available in the Earth. In this context, the present work aimed to achieve pervious mortar filters with organic additives (pure and chelated lignin and activated charcoal) for the use of rainwater. The collected water originates from rain precipitations occurred in Pelotas, RS, at the year of 2014. Were produced duplicated filters and then placed along the water tanks. The production of sample mortar followed the recommendations of ABNT, as well as the collect and storage of rainwater. The water samples were collected and analyzed by staff assigned to laboratory with credential provided by the Health Ministry. The mortar samples were previously analyzed considering its mechanical properties. Following the filtering process of rainwater, water quality parameters were verified. The mechanical properties of mortar which composes the filtering element with addition of lignin were dramatically reduced. Were found positive results for DQO, total cupper and color, considering its situation compared to respective reference document. Can be concluded, based on results analysis, that the lignin addition may improve some quality parameters. However, a lot of attention must be focused in future works aiming the increasing of mechanical resistance of the filtering element.