Estudos de viabilidade para reutilização de água residuária da lavagem de tanques na produção de tintas imobiliárias

Abstract

The paint industry represents one of the most significant segments of the Brazilian chemical sector, with architectural paints accounting for most national production. Considering the high-water consumption in industrial processes, including the tank cleaning stages between batches, this study evaluated the feasibility of reusing the water generated during the setup of water-based, non-pigmented products. Representative samples of the residual water were collected for the laboratory-scale production of paints using different reuse proportions (30%, 60%, and 100%) in the formulation. Subsequent physical-chemical, microbiological, and comparative performance analyses were conducted. The results indicated that water reuse is technically feasible, maintaining the required quality parameters, and generating significant positive impacts by reducing potable water consumption, effluent generation, and solid waste. The economic analysis demonstrated a substantial reduction in the operational costs of the Effluent Treatment Station (ETS) and a return on investment of less than one year. The proposal aligns with the circular economy principles, ISO 14001, and current environmental legislation, such as CONAMA Resolution No. 430/2011. It opens avenues for future investigations into expanding the system to other paint shades and improving logistics.