In Tiruppur, in the province of Tamil Nadu in southern India, at the heart of the Indian cotton treatment industry, there are high-performance treatment plants that serve as a shining example of how modern wastewater management works. In the 1990s hundreds of textile factories, especially the many cotton dyeing factories there, still dumped large amounts of untreated effluent into the Noyyal River, a vital source of drinking water for the entire region.
The effluent situation improved when the Tamil Nadu Pollution Control Board developed special methods of treating the effluent from cotton dyeing factories as part of a country-wide program. Dedicated treatment plants for large textile companies, as well as for small and medium-sized dyeing factories, were and are still being built. Such plants can be ideally combined with existing production facilities. In the case of newly constructed factories, specially optimized production processes offer further opportunities for recycling processed water and avoiding the generation of wastewater.
At present about 24,000 cubic meters of wastewater are treated with membrane elements and ion exchangers from LANXESS in the Tiruppur region. For example, in one textile factory in Tiruppur a total of 154 Lewabrane ROS400 HR membrane elements and 7,500 liters of Lewatit CNP 80 WS cation exchange resin have been used since August 2016 to process about 85 cubic meters of wastewater per hour.