Study of the Water and Energy Consumptions in the Dyeing of Cotton with Curcuma Longa by Pad-Batch Process Using Response Surface Methodology

Mathematical modeling was employed in order to optimize pad-batch process using C. longa natural dyestuff applied in dyeing of cotton, against the conventional dyeing by exhaustion with the same dyestuff under best applications parameters recommended by dyestuff supplier. Ecological costs, consumption of water, electrical, and thermal energy, were assessed. The application of the model in the studied process versus the conventional process demonstrated that is possible to obtain an economy of 1.418 x 10(6) J kg(-1) of energy, in addition to an economy of 95% in water consumption, without significant detriment in the color fastness assessed.