Karur home-textile dyeing effluent: a guide
How Karur dye houses producing bed linen, curtains and furnishings treat heavy cotton dyeing effluent and recover water for reuse.
Heavy cotton, heavy loads
Home textiles use thick cotton fabrics dyed in deep, even shades, often with reactive and vat dyes. That means large volumes of salt, alkali and unfixed dye in the effluent, with strength rising for dark shades.
Treatment in individual and common plants
Karur units treat effluent in their own plants or send it to a common effluent plant. Both follow a similar train: equalisation, pH correction, coagulation, colour removal, biological treatment, filtration and, in many plants, RO for water recovery.
Colour first, then floc
Dissolved reactive dye passes straight through ordinary coagulation. SunDec SC05 binds it into particles first; then a cationic grade such as Cationic HQ gathers everything into large flocs that settle in the primary clarifier.
Keeping sludge down
Metal-salt coagulants add their own weight to the sludge. SunMac SC04, a liquid cationic polymer, can replace part of the coagulant in many plants and reduce the sludge sent for disposal.
Protecting RO
Plants that recover water need a clear clarifier overflow, since carried-over solids foul the filters and membranes downstream. Check overflow clarity daily and jar-test the equalisation tank when shades change.
Regulation and supply
Units are regulated by the Tamil Nadu Pollution Control Board. Karur is about a day by road from our Chennai stock.
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