Organic matter removal in textile wastewater by applying ozone.

Abstract

The study of the oxidation of organic matter, measured as the 5-day Biochemical Oxygen Demand and Total Organic Carbon, was developed through the application of ozone in fully mixed Batch reactors, with the objective of evaluating the oxidative capacity when applied to the wastewater of the textile industry, considering reaction times between 10 and 60 minutes. A SEFILTRA Ozone Generating set was used, which is characterized by an air flow of 2 dm3 / min, ozone concentration of 9.50 mg / dm3, an O3 production of 19 mg / min and a weight% of 0.8. 30 dm3 of the effluents from the textile companies «Jhonatex» and «Textil Buenaño», located in Tungurahua and «Modatex» in Azuay, were mixed. In total, 90 dm3, to which three repetitions of analysis were performed after mixing, using the mean values ??as initials of the ozonation process. Reaction times between 10 and 60 minutes were selected, each process being repeated three times. For each ozonation time, the reactor worked with 5 dm3 in each of the three replicates with each time. The aforementioned indicator parameters of contamination showed satisfactory oxidative levels, around 90% removal, after 50 minutes of reaction, complying with the current regulatory restriction for discharges into sewers and freshwater bodies. Both were oxidized via ozonation, according to second degree polynomial behaviors, with correlation coefficients above 0.97.