Reutilización del efluente generado en el proceso de lavado de tanques estacionarios en la formulación de pinturas base agua (látex) tipo 2

Abstract

This research work studied the reuse of the effluent generated in the process of washing stationary tanks of the Wesco Paints industry, located in the city of Quito, with the objective of reusing the waste water in the formulation of water-based paints. The methodology began with an analysis of water quality, determining parameters such as: BOD 60.33, pH 8.65, total solids 81.22 and turbidity: high; then, a mass balance was performed, where it was found that the effluent contains 88% paint and 22% water. Based on the company needs, a pretreatment was carried out, which consists of a filter before storing the effluent, adding a biocide (0.2%), which is used to carry out the sedimentation process, and finally, before discharging the pretreated effluent, a filtration was carried out. Tests were performed for the addition of the effluent in the water-based paint formulation T1 (high quality), T2 (medium quality), and T3 (low quality), at laboratory level; where after the dispersion process for approximately 1 hour, at 1300 RPM and when the mixture presented its correct fineness, two formulations were made: (a) 100% of the residual water was reused, resulting in a run mass; and, (b) using 50% of residual water, with 50% of potable water; obtaining as results its validation with the second formulation in the three types, comparing and approving them with the NTE INEN 1544 standard for water-based paints (latex); concluding that the reuse of the effluent improves some quality parameters and recirculates in its totality, helping the company to reduce time and money; recommending to use the formulation a) as a new product.