Coagulação química melhorada visando o tratamento de água cinza

Abstract

The reuse of gray water promotes a significant reduction in potable water consumption and wastewater production, as the water is reused for non-potable purposes, before being discarded in the sewer system. However, this water must be treated ensuring user safety and the environment. The present work describes the development of an experimental system for obtaining an improved coagulation, which employs the use of a coagulation aid (oxalic acid, trichloroacetic acid, ascorbic acid, salicylic acid and citric acid) with a treatment system consisting of batch reactors, magnetic stirring and decanting. Fifteen systems, the coagulation system, addition of auxiliary coagulation without pH control and addition of auxiliary coagulation with pH control, with three different concentrations of clotting aids were evaluated. The objectives of this study include the analysis of pH, total solids, electrical conductivity and turbidity analysis and percentage of removal of impurities based on the above parameters. For this study, the crude ash treated water is synthetic. The experimental system showed potential for the treatment of gray water recovery, due to the simplicity of the system, and also because it offers significant removal of turbidity values. The results were compared with data from the literature and showed satisfactory results in turbidity parameter. In general, the innovative use of coagulation aids was found to be effective for the removal of impurities parameters.