Necessity of Waste Water Treatment Plant in Textile Manufacturing
The textile manufacturing industry utilizes water in various processes. A large volume of water is used in the dyeing and finishing processes & ends up as waste water which needs to be treated before its final discharge.
In the wet process cause considerable variation in the wastewater characteristics such as intense color, high chemical oxygen demand (COD), dissolved solids values and highly fluctuating PH. About 5-20% of dye is lost due to its partial adsorption on the fibers during the dying process.
Dyes are manufactured to have high chemical resistance that is very difficult to degrade. Dye solutions usually contain anti-bacteria and anti-fungi agents which are used to give the fibers more resistance to biological degradation. The electrochemical process can be a viable alternative. It consists of electro-flocculation which carried out in an electrochemical reactor where Al3+ or Fe3+ ions are generated due to a given applied potential. This stage is known as the anodic stage, in which the metallic aluminum or iron is oxidized. These compounds have a strong affinity for dispersed or dissolved substances as well as counter-ions to cause coagulation or adsorption phenomena.
These results illustrate the effectiveness of the electro-flocculation process in the treatment of textile effluents. By considering that generates a coagulating agent that forms flakes of particulate material and at the same time, it carries out flotation of the generated residue; this process is particularly interesting from the point of view of relative simplicity of automation and low cost.