It is important to give a previous treatment to reduce the discharge of pollutants to the affluents, that is why the need arises for the company to improve the design of the lagooning system to capture and degrade the pollutant load to be later discharged to the Suarez River; since the current one is in a period of renovation. The one developed in the present work consists of two anaerobic lagoons and a facultative one whose purpose is to achieve a percentage of reduction greater than 90% of BOD5, this being the only parameter that is above the permissible limits according to resolution 631 of 2015.