Colour
Reactive and disperse dyes are engineered to be stable. PAC removes disperse and vat dyes well; reactive dyes are harder and often need a decolourising polymer alongside.
Application — textile & paper
PAC for textile and paper mill effluent
Dyeing and paper effluent are among the hardest streams to treat — high colour, high COD, variable pH. PAC is the workhorse coagulant for both, and dose economics matter enormously at these volumes.
What you are fighting
Textile and dyeing effluent
COD load
Sizing agents, surfactants and dye carriers push COD high. Coagulation typically removes 40–60% before biology.
pH swings
Dyehouse effluent swings between strongly alkaline and acidic through the batch cycle. Equalisation before coagulation is not optional.
Surfactants
Wetting and levelling agents interfere with floc formation and cause foaming. Higher basicity grades usually cope better.
Temperature
Effluent often arrives hot. Coagulation kinetics change with temperature — a dose optimised on a cooled sample may not hold.
Salt load
High TDS from salt-heavy dyebaths affects coagulation. Jar test on real effluent, never on synthetic.
Paper mill effluent
Paper and board mills, including recycled board operations, generate effluent heavy in fine fibre, filler, starch and de-inking residue. PAC serves two purposes here: it cleans up the effluent for discharge, and it recovers fibre and filler that would otherwise be lost.
Fibre recovery is the part that changes the economics. Material captured in the clarifier and returned to the process is raw material you have already paid for. On a mill of any size, that recovery frequently pays for the coagulant several times over.
PAC is also used in the wet end as a retention aid and for pitch and stickies control, though those applications need grade selection matched to the furnish rather than a general-purpose product. Tell us the application and we will confirm whether our grades suit it before you order.
“At textile and paper effluent volumes, a 15% dose reduction found in a jar test is worth more per year than any price you will negotiate per tonne.”
FAQ
Common questions
It removes disperse, vat and sulphur dyes effectively. Reactive dyes are more difficult and usually need a decolourising polymer used alongside PAC rather than PAC alone.
Commonly 100 to 300 mg/L as product, but the range is wide because dyehouse effluent varies enormously between mills and between shifts. Jar test on real effluent sampled across the batch cycle.
Yes — for effluent treatment, fibre and filler recovery, and in some cases as a wet-end retention aid or for pitch control. Grade selection matters for wet-end use, so tell us the application.
Yes. Sharjah, Ajman and RAK have a substantial textile and paper base, and we supply mills there in jumbo bags and bulk.
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