Diseño de una planta de tratamiento de aguas residuales para la empresa procesadora agroindustrial “mis frutales” ubicada en la Parroquia San Luis, Cantón Riobamba, Provincia de Chimborazo

Abstract

The agro-industrial processing company "Mis Frutales" does not have a wastewater treatment system, causing the alteration of its properties, which are deposited directly into the sewage system. This technical project aimed to design a wastewater treatment plant for the company. The implemented methodology had an experimental stage in which the average production flow of the company was determined for four weeks from 3:00 p.m. to 4:00 p.m., obtaining a value of 32.8 m3/d as design flow for the dimensioning of the components of the treatment system. To determine the state of the water, a composite sample was characterized through physical-chemical and microbiological analysis carried out in the Water Quality Laboratory belonging to the Faculty of Sciences, obtaining as a result a BOD₅ value of 660 mg/L, COD of 930 mg/L, phosphorus of 18.5 mg/L and sulfides of 128 mg/L, the same ones that do not comply with the values established in Table 8: Discharges to the Public Sewerage System. A test was carried out of treatability through the Jar Test using 5% Aluminum Polychloride at a concentration of 90 ppm, and based on the biodegradability index, it was essential to implement a biological treatment. In this way, a treatment system consisting of an approach channel, grids, Parshall flume, rectangular primary settler, rapid mix coagulator, and an activated sludge system was proposed, removing 71% of contaminants. According to the results obtained, it was possible to comply with the Ecuadorian regulations, for which it is concluded that the proposed treatment system is feasible for the company because it allows to improve the water quality.