STUDY ON QUALITY OF EFFLUENT DISCHARGE FROM TEXTILE BLEACHING AND DYEING UNITS CETPS IN KARUR, TAMIL NADU

摘要

In the last two decades the extensive growth of bleaching and dyeing units in Karur, has adversely affected the Amaravathy river water quality as well as the groundwater quality of the river basin. Out of 487 units 391 units are member in common effluent treatment plant (CETP). 8 CETPs are in operation. The remaining 96 units have provided individual effluent treatment plant (IETP). After treatment the effluent is let into Amaravathy river. Tamil Nadu Pollution Control Board (TNPCB) monitors the quality of treated effluent discharge from CETPs and IETPs on monthly basis. The report of analysis reveals that the total dissolved solids, chlorides, bio chemical oxygen demand, and chemical oxygen demand are exceeding the permissible inland surface water discharge standards. TNPCB have directed all the dyeing units to provide reverse osmosis (RO) plant with reject management system (RMS) and recycle the entire treated effluent so as to achieve zero liquid discharge (ZLD) level.