Tirupur: The Tamil Nadu Pollution Control Board (TNPCB) on Thursday ordered closure of 10 dyeing units in the Tirupur knitwear cluster which failed to comply with the Supreme Court order pertaining to pollution caused by the dyeing units on River Noyyal. The power and water supply to these units was also disconnected. TNPCB District Environmental Engineer R. Kannan told The Hindu that the said 10 dyeing units, which had Individual Effluent Treatment Plants (IETPs) on their premises, had failed to ensure Zero Liquid Discharge (ZLD) during the treatment of the effluents and hence, the action.