Ahmedabad dye and textile CETPs: a guide
How dye makers and textile process houses in Ahmedabad's Vatva, Naroda, Odhav and Narol clusters pre-treat effluent to meet common effluent plant limits.
Dye and textile clusters
Ahmedabad has long been a centre for both textile processing and the dyes and intermediates that go into it. Much of this industry sits in the GIDC estates at Vatva, Naroda and Odhav and in the Narol processing cluster, and most units send pre-treated effluent to common effluent plants.
What dye-making effluent carries
Dye and intermediate manufacture produces acidic or alkaline effluent with intense colour, high COD and dissolved salts. Strengths swing from batch to batch, so equalisation before treatment is essential.
Colour and solids
Neutralisation and coagulation remove much of the suspended matter. Dissolved dye needs SunDec SC05, which binds it into particles; Sunfloc Cationic HQ then builds large flocs that settle in the primary clarifier.
High-COD streams and Fenton
Strong streams are often pre-treated with Fenton oxidation or evaporation. The iron sludge from Fenton settles faster with an anionic grade such as Sunfloc Anionic HQ.
Meeting CETP limits
Common effluent plants set inlet limits for pH, COD, colour and suspended solids. Consistent pre-treatment, logged doses and a regular jar test on the equalisation tank keep a unit within them.
Regulation and supply
Units are regulated by the Gujarat Pollution Control Board. Road freight from Chennai usually takes four to five days, so keep a margin of stock.
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