Ecofriendly Dyeing Process with Enzymes

Biological degradation of many dyes is difficult. Therefore dyeing baths give high pollution load to waste water. In this work, the use of enzyme in the dyeing of leather has been studied with the aim to improve the exhaustion of dye and to reduce pollution load of dyeing waste bath. For this purpose, chromium-tanned leather were treated with different ratio enzyme after the neutralization process. Then dyeing has been carried out. The effect of bacterial protease on colour properties of leathers was investigated. Also the change of the amount of COD load in the waste dye baths and leather physical properties were investigated. The obtained test and analysis results show that when the enzyme was used in the dyeing process, the COD load of waste dye baths was reduced.