Erode, Bhavani and Perundurai: an effluent guide
How yarn and fabric processors in Erode and Bhavani and the tanneries of Perundurai treat their effluent close to two protected rivers.
Rivers that set the limits
Erode and Bhavani sit where the Bhavani joins the Cauvery, and both rivers feed drinking water and farms downstream. That is why processing units here work under tight discharge limits set by the Tamil Nadu Pollution Control Board, and many recover water rather than discharge it.
Yarn and fabric processing
Dyeing, bleaching and mercerising produce hot, alkaline, coloured effluent with high dissolved salts. The usual treatment is equalisation, pH correction, coagulation, SunDec SC05 for colour and a cationic Sunfloc grade for the floc, followed by biological and tertiary treatment.
Tanneries in the Perundurai estate
Tannery effluent carries protein, fat, lime, sulphide and chromium. Chrome-bearing streams are usually segregated and treated for chrome recovery. The combined effluent is clarified with a cationic grade such as Cationic HQ after coagulation.
Common effluent plants
Many small units send effluent to a CETP. Variable inflow from dozens of members makes a CETP harder to run, so it pays to jar-test the equalised effluent more often than a single-unit plant would.
Sludge
Both dyeing and tannery sludge must be dewatered before disposal. A cationic grade helps the filter press release water and reduces the weight sent for disposal.
Supply
Erode is a short road trip from our Chennai stock, so units can order in smaller lots and keep polymer fresh. Ask us for a free jar test on your equalisation-tank sample.
Not sure which grade suits your water?
Send us a one-litre sample or describe your process. We test it in our lab free of charge and recommend a grade and starting dose, and quote within 1 business hour.