Diseño de una planta de tratamiento de aguas residuales de la Empresa de Lácteos Santa Cruz-Santiago de Pillaro – Ambato.

Abstract

In the present investigation it was proposed to design an industrial water treatment plant for the dairy company "Santa Cruz", the research was carried out in two locations; in the Pillaro canton and in the water quality laboratory of the ESPOCH Faculty of Sciences, located in the city of Riobamba. To begin the investigation it was necessary to sample the residual water, carrying out the initial characterization of the sample to determine the type of treatment that is carried out to the water, with this it was determined that the biochemical oxygen demand (BOD), the chemical oxygen demand (COD), the total solids and fat content were the main pollutants of the water and these do not meet the TULSMA BOOK VI, TABLE 8. In order to determine the best treatment, a jar test was carried out, establishing that the best coagulant for this type of water is the 10% aluminum chloride polymer in a dose of 5ml / liter of residual water, of which a turbidity of 50 was obtained, pH of 7.38 and color of 184; that meet the standard. From these results we obtained the different treatments that were performed on a laboratory scale, which included a grease trap, an aeration system, a physical-chemical treatment and filtering. In the design of the equipment the first step was to establish the design flow, it was determined that the average flow of wastewater production of 30.8 L / min; this data was taken as a basis for calculating the system sizing, it was concluded that no parameter was outside the permissible limit; in addition the BOD values of 150 mg / L, QOD values of 413 mg / L, the total solids values of 892 mg / L and for the content of oils and fats values of 9.6 mg / L.