Diseño de un sistema de reciclaje de los baños de curtición en la Empresa Serviceros S.A.

Abstract

A recycling system for the tanning baths of Servicueros S.A. was designed as a mechanism to reduce water consumption and pollutant load in the liquid discharges. To obtain the volume of water to be recycled, the partial capacity of the drums and the density of the leather were determined, registering a maximum volume of 5.93m3. The sizing of the system was carried out by means of engineering calculations based on the experimental data and the process variables. The system consists of a 5.93m3 reinforced concrete subway storage tank, from which, with the help of a 0.5HP Pump 1, the wastewater required for the treatment of the leather will be pumped. 5HP, the wastewater required for recycling to a decanter tank of high density polyethylene, with a volume of 6m3, where sedimentable solids and denatured collagen will be separated by adding sulfuric acid that will be contained in a 30L high density polyethylene dosing tank; once the wastewater at pH=1 will be taken to the pumps with a Pump 2 of 1 HP after the Purging operation to start the Piquel and Chrome Tanning. In order to guarantee the tanning quality by means of Bath Recycling, 7 pilot scale recirculations were carried out with 6 strips each, obtaining wetblue with a content of 3.7-3.8% of Chromium Oxide. An indirect titration with sodium thiosulfate was used to analyze the amount of chromium III salt in the wastewater from each of the recycles. This recycling system will have an installed capacity of 5.93m3/day, with a saving of 43-45% of Chromium Salt and between 66-83% of Sodium Chloride.