Avaliação da mudança no sistema de tratamento de efluentes com vistas para o reúso

Abstract

Effluent reuse has been increasingly used in industries due to water savings and the reduction of environmental impacts caused on natural resources. Thus, the objective of this study was to evaluate the technical feasibility of a modernization of the treatment plant using reverse osmosis membrane as a tertiary treatment, aiming at the reuse of effluent in the manufacturing process without distinction of use and/or for the cooling towers. The results of the monthly analyzes collected for the effluent release grant were analyzed in a period of two years. Analyzes of the final effluent parameters were performed: iron, silica, chemical oxygen demand, hardness, total alkalinity, chlorides, electrical conductivity, biochemical oxygen demand, turbidity, thermotolerant coliforms and pH. The electrical conductivity compared to the requested limits was on average 177μS/cm, below the 300μS/cm stipulated to not cause problems in the process. Regarding hardness, which is another determining factor, a much lower limit than the requested was detected, being measured at values below 4mgCaCO3/L. The parameters of chlorides, COD, BOD, iron, silica, thermotolerant coliforms, turbidity and alkalinity are all below the limits of use, with the pH parameter being the only one to be corrected so that the effluent can be reused. It is concluded with the study carried out that it is possible to reuse the effluent in the industrial process, and thus, allowing a truce to the water table and granting service. [resumo fornecido pelo autor]