Textile wet processing industries play an important role in earning foreign currency of Bangladesh. Wet processing sector includes the tasks of dyeing, washing, steaming, printing, etc. of textile products which requires water as a major component. Without the sector any export quality garment is not possible to be manufactured.
Nowadays as the need of quality product is increasing, it results in the rapid increase of wastewater in that particular sector. The water contains various types of chemicals, metal ions, dye particles and many other carcinogenic agents. The wet processing industries are not concerned about this harmful contaminated water. They discharge their dye water into the environment after dyeing, printing or other tasks without any purification. As a result, the wastewater is getting into the waters of rivers and other natural water bodies and polluting them with harmful chemicals.To cope with the present situation, the concerned authority should put emphasis on the purification of the textile wastewater. Unfixed dye particles can be removed from dye baths and there are many treatments (e.g. various types of filtration) which can be used to regain the dyeing ability of those dye particles. In many cases, though the dyeing ability will not be proper to manufacture of export quality products, but it can be possible to manufacture other highly demanded products for local market. Proper researches are also required to solve the problem of water pollution from industrial waste. Otherwise, the layer of surface water pollutants and underground mineral water may congregate which would be harmful for local people to drink or use.
Saima Mahjabin, Department of Textile Engineering (Wet Processing), National Institute of Textile Engineering & Research (NITER)