Rediseño de un sistema de tratamiento de aguas residuales para la curtiduría brito de la parroquia Atahualpa – Tungurahua

Abstract

The objective of this study was the design of a wastewater treatment system for the “Brito” tannery in Atahualpa - Tungurahua province. It began with the characterization of the water from the peeling process, determining that the parameters of pH, COD, BOD5, sulphides, total solids, sedimentable solids, suspended solids exceed the permissible limits in the regulations of Ministerial Agreement 097-A table 8 and are discharged into the public sewer system. To choose the ideal treatment, the biodegradability index was used, having a value of 0.71, so a biological and physical-chemical treatment was carried out. In the treatability process, aeration was carried out for 8 hours and 5% manganese sulphate was added to oxidize sulphides. 5 ml of 1% ferric chloride was used as a coagulant and 0.5 ml of 2% anionic polyelectrolyte as a flocculant. The results showed the removal of more than 90% in all parameters. Subsequently, the treatment plant was designed based on the variables and design flows according to the production capacity of the company, establishing the implementation of an inlet channel with grids, aeration tank, followed by an agitation channel, a settler and finally filtering. It is recommended that once the wastewater treatment system is implemented, maintenance periods and characterizations of the wastewater be established to verify its effectiveness over time.