Uso do tanino associado ao sulfato de alumínio como coagulantes para o tratamento de efluente de lavanderia industrial

Abstract

This research, in view of the increasing pollution of drinking water and pressing concerns with a preserved and sustainable environment, has verified the possibility of using more sustainable and renewable source coagulants for the treatment of industrial laundry effluents. The chemical physical treatment of these effluents was done through the use of tannin coagulant, independently or associated with aluminum sulphate. From the experiments carried out, it is concluded that the combination of these coagulants allows not only a turbidity removal above 90% for concentrations of 1500 ppm of tannin and 2500 ppm of aluminum sulphate, but also for color removal of the effluent from a strong pink to transparent. Although such results mitigate the environmental costs of effluent treatment, they, on the other hand, cost the process economically. It is therefore necessary, if there is a social desire for sustainability, to encourage new research with tannin itself instead of inorganic coagulants and public policies that will increase the inspection and costs of polluters, making the demand in the public sector viable and less polluting, but more expensive, technologies and materials.