Rediseño de un sistema de tratamiento de aguas residuales para Descarnes López de la parroquia la Peninsula -Tungurahua

Abstract

The objective of this curricular integration work is to redesign the wastewater treatment system of the company Descarnes López, Ambato canton, Tungurahua province. For this, the wastewater of the company was characterized, resulting in the following values in the wastewater of the hair: pH 11.25, conductivity 34.68 Siems / cm, turbidity 8388 NTU, fat 90 mg / L, suspended solids 9500 mg / L, settleable solids 400 ml / L, total solids 4760 mg / L, sulfides 2880 mg / L, COD 20600 mg / L, BOD5 12800 mg / L. While in the residual water of vegetable tanning the following values pH 3.65, conductivity 19.04 microSiems / cm, turbidity 130 NTU, fat 40 mg / L, suspended solids 1500 mg / L, sedimentable solids 170 ml / L, total solids 6640 mg / L, COD 9010 mg / L, BOD5 2980 mg / L. In order to comply with environmental legislation for the discharge of effluents to the public sewer system. To choose the ideal treatment, the biodegradability index of the fur water was determined, achieving a value of 0.62 and 0.33 in the vegetable tanned water. A biological treatment is applied to the riverbank process and begins with the oxidation of sulfides, using manganese sulfate as a catalyst and a constant supply of air. The vegetable tanning effluent begins with the addition of lime to increase the pH to eight, this causes precipitation. Finally, poly aluminum chloride (PAC) coagulant and anionic polyelectrolyte adjuvant are applied to the residual water from vegetable tanning. The flocculant used for the fur water is ferric chloride and the polyelectrolyte as an adjuvant. All this is determined by means of the jug tests, the efficiency of the tests was verified by characterizing the treated water, managing to locate most of the parameters within the norm. It is recommended to adjust the pH of the wastewater prior to treatment to obtain better results.