SunDec – Decolorant / Colour Removal Polymer Supplier in Tiruppur
Tiruppur dyes much of India's knitwear under zero liquid discharge. SunDec binds reactive dye so the clarifier can settle it ahead of RO.
Jar test with the shade mix
Test on the mixed effluent, with the current shade mix. Re-run it whenever the dye list changes.
Colour is the first problem under ZLD
Dyeing units on the Noyyal have worked under a zero liquid discharge requirement since 2008. Treated water is recovered for reuse and no liquid effluent leaves the plant, so colour that slips through the clarifier lands on the filters and RO membranes.
Reactive dyeing leans on salt and soda ash, which leaves the effluent hot, deeply coloured, alkaline and salty. Dissolved reactive dye passes straight through ordinary coagulation.
Documents for SunDec SC05
Where SunDec sits in the train
SunDec SC05 is a dicyandiamide-resin decolorant. Its job is to convert dissolved dye into particles that a clarifier can settle. In the usual order, equalisation and pH correction come first, then coagulation, then SunDec, then a cationic flocculant to build large flocs.
Dose the decolorant before the flocculant, not after it. A clear primary overflow means fewer RO cleanings and less load on the evaporators, the most expensive part of a ZLD plant to run.
When the shade mix changes
Strength swings from batch to batch as shades change, and dark shades usually need more decolorant. Re-check the dose at every big change in the shade mix. Watch for overdosing, which shows as slimy, slow-filtering sludge. A jar-test kit at the plant, used on the equalisation tank, catches drift early.
Tiruppur is about 455 km from our Chennai stock and a consignment usually lands in one to two days. The Tamil Nadu Pollution Control Board sets the consent conditions for your plant; see the Tiruppur ZLD guide.
SunDec questions from Tiruppur
Does SunDec work on reactive dyes?
Yes. Dissolved reactive dye is what it is meant for, and a jar test on your effluent sets the dose.
Should I add SunDec before or after the flocculant?
Before. Bind the colour first, then flocculate.
Can I reduce the sludge as well?
SunMac can support the coagulant and lower sludge volume. See SunMac, or ask us to test the two together.
SunDec in other cities
More on Tiruppur
Start a SunDec trial in Tiruppur
Knitwear dyeing units and CETPs in Tiruppur: send a litre from your equalisation tank and we will test SunDec with the flocculant free of charge.