Rediseño de la planta de tratamiento de aguas residuales de la fábrica textilera Laboratorio del Denim del cantón Ambato

Abstract

The objective of this study was to redesign the wastewater treatment plant of the textile factory “ Laboratorio del Denim”, which began with the on-site visit to find out the current situation of the plant, subsequently, the physical-chemical characterization of treated water samples leaving the plant was carried out, finding the parameters of COD 699 mg / l, BOD5 280 𝑚𝑔𝑙⁄, sulphate 595 mg / l, sedimentable solids 51,325 mg / l, colour 1418 Co / Pt, turbidity 137.5 NTU and conductivity 1421.15 μS / cm that exceed the maximum permissible limit established in current environmental regulations. To define the most ideal treatment, the biodegradability index was determined in which a value of 0.40 was obtained, opting for physicochemical treatments (coagulation and sedimentation), for which the respective treatability tests were carried out where it was determined that the ideal concentration of aluminium polychloride (PAC) is 60 ppm at 200 rpm for a time of 2 min, then decrease to 40 rpm and keep stirring constantly for 30 min, later, it was left to rest for 1h, achieving the clarification of the water, to determine the efficiency of the tests carried out, the characterization of the treated water was carried out, where it was obtained that all the parameters are within the current environmental regulations. Finally, the redesign of the WWTP was carried out, being necessary the implementation of a cylindrical settler with a conical bottom for easy sludge evacuation, an agitation system and a dosing tank for the PAC solution, the implementation of the proposed units is recommended. and apply processes that involve clean and sustainable products which will contribute to the environment.