Surat textile processing effluent: a guide
How Surat's polyester dyeing and printing units and the CETPs at Pandesara and Sachin handle colour, solids and heavy sludge from synthetic textile processing.
A synthetic-textile city
Surat processes huge volumes of polyester and other synthetic fabric for sarees and dress material. Dyeing uses disperse dyes at high temperature, and printing adds thickeners, pigments and wash-off water.
What the effluent carries
The effluent is hot and coloured, with carriers, dispersing agents, thickeners and fine fibre. Printing wash-off can be thick with gum and pigment, which loads the clarifier with solids.
Colour removal
Disperse dyes are less soluble than the reactive dyes used on cotton, but much of the colour still passes coagulation. SunDec SC05 binds it, and a cationic grade such as Sunfloc Cationic HQ settles the combined floc.
Common effluent plants
Many units send pre-treated effluent to common plants at Pandesara and Sachin. These handle large, variable flows and produce heavy sludge, which a cationic polymer conditions before the filter press.
Lower sludge with a liquid coagulant
Metal-salt coagulants add weight to the sludge. SunMac SC04 can replace part of the coagulant in many plants, cutting the sludge sent for disposal.
Regulation and supply
Units are regulated by the Gujarat Pollution Control Board. Road freight from Chennai usually takes about four days.
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