Abstract:

In order to avoid fabric damage and reduce discharge concentration and quantity of waste water, a biological enzyme pretreatnent process on cotton-rayon elastic fabrics was put forward. Anefficient surfactant with excellent permeability and emulsifying properties was selected to combine withbiological enzyme in the treatment of grey cloth. Therefore, the impurities on grey cloth were degraded, emulsified and solubilized. Then the oxygen bleaching process were conducted in the following pretreatment peocess. The removal rate of pectin, capillary effect, whiteness, strength damage rate and pollutant concentration were investigated by parallel and orthogonal experiments. The results showed that the removal rate of pectin reached 89.3%, capillary effect was 9.5 cm (30min), and the whiteness reached 85.9%. The strength damage rate was less than that of conventional process. The sample quality meet the requirement of the semi-finished peoducts. The COD value of wastewater was 35.9% lower than that produced during regular process. In the meanwhile, color degree reduced by 56 times and pH value decreased by 1.7 in comparison with the conventional process used in factory. The bilogical enzyme pretreatment process gad obvinus effect on emission reduction. 

Key words: cotton/rayon elastic fabric, pretreatment, enzyme, energy conservation and emission reduction