Ozone color removal from textile industry waste water.
Textile industry wastewater treatment
Wastewater that is discharged by dye manufacturing and textile finishing industries has become an environmental concern. The legal requirements concerning discharge of contaminated waste water are reinforced in many countries and the discharge fees are increasing. According to our experience large international clothes companies are setting a new standard of requirements, often higher than the local legislation requires.
Why textile dye is so hard to remove from waste water
During the dyeing process, the dye is dissolved into the process water and it is still there when the process water later is released as effluent. The effluent contains high content of dyestuff, surfactants and other additives that are generally made up of organic compounds with a complex structure.
The dissolved dye compounds of the effluent are resistant to light, acids, bases and oxygen, as these are the desired properties of the dyed clothes. It’s therefore difficult to treat textile wastewater with conventional methods as these organic compounds have poor bio-degradability.
The main environmental concern of textile wastewater lies in the dissolved organic dye compounds as some of them are aromatics and considered carcinogenic.
How to remove dye from textile industry wastewater with ozone
With high concentration ozone it is possible to break down the dissolved organic dye compounds and thereby reduce the amount of color and enhancing the biodegradability of the wastewater. Primozone believes that the most efficient way to remove dissolved dye is using a combination of biology, filtration and ozone.
This is how efficient ozone is for removal of dissolved dye from textile waste water: