Avaliação do tratamento de efluente bruto de indústrias de curtume de pele bovina pelo processo de eletrofloculação através de análises físico-química

Abstract

The water available in our environment is very important to life on earth, and also to the majority of production process of food, clothes and any kind of goods that uses water on large scale. The leather tannery is one of the most polluting activity in the industry, whereupon uses several toxic products besides the large quantity of water that is also required in the process. For this reason the search for new techniques to industrial wastewater treatment that are less agressive to the enviroment in order to minimize the impact made by recipient waters outflow are of great value. This study consisted in an experimental laboratory research by the quantitative method as a way to evaluate the efficiency of the leather tanning wastewater treatment by electroflocculation according to the current environmental legislation, taking into consideration the values of Chemical Oxygen Demand (COD), electrical conductivity, turbidity and hydrogenionic potential (pH) measured before and after the treatment. For the electroflocculation experiment a set of bench-top reactor in a batch processing system, using a 250 mL glass beaker, two aluminium plates as electrodes connected to a DE LORENZO DL 2102 AL three-phase power source was rigged in the laboratory of Instituto Federal de Educação, Ciência e Tecnologia de Goiás, campus Itumbiara. From the treated and non-treated samples all physico-chemical parameters measurement was taken applying the methods of Standard Methods for Examination of Water & Wastewater. From the analysis made before and after the electroflocculation experiment the reduction values of turbidity and COD and increased values of pH and electrical conductivity was verified. Those results indicate that the electroflocculation experiment to leather tanning wastewaters treatment is a promising technique to reduction of organic matter found in the industrial wastewater, making the treatment results favorable to theenvironment.