Role of Activated Carbon for Removal of Dyes from Textile Rejects: An Update

In this chapter, we studied the wastewater of industrial textile unit. After characterizing the wastewater the trials treatment by adsorption in CAB, were conducted at the laboratory scale, by studying the removal of color and turbidity.

Textile industries positively affect the economic development worldwide. Fibre production in textile factories includes dry and wet processes. The wet process uses a considerable quantity of potable water and releases highly contaminated wastewater. This process consists of sizing, de-sizing, sourcing, bleaching, mercerising, dyeing, printing and finishing techniques. The study of turbidity indicates a variation between 120 and 190 NTU for the three samples. As for their conductivity varies between 5,2 and 20 mS.cm-1. Moreover their pH varies in the field of basic pH. Measuring the temperature of these three samples showed values varying between 25 and 30°C. The levels of suspended solids range between 146,8 and 514,7 mg L-1. Textile effluents discharges are complex, loaded with organic and inorganic materials. They have varying characteristics with time and can be toxic of microorganisms.

The results show that the measured absorbance at 436 nm decreased to 2,020 A and it stabilizes at this value. To the absorbance of the color measured at 525 nm decreases to 3,072 A and it stabilizes. The absorbance measured at the wavelength 620 nm decreases and reaches a minimum value of 1, 918 A after ten hours. The effluents from the textile sector, whose waste water is discharged into the receiving environment without any treatment, are evaluated subjectively and quantitatively in this study.