Coimbatore foundry and textile mill water: a guide
How Coimbatore foundries keep recirculated water clean, how its textile mills handle coloured effluent, and how city water works manage monsoon turbidity.
Two industries, two problems
Coimbatore's foundries and pump makers need clean recirculated water for sand washing, cooling and machining. Its textile mills need to remove colour and solids before discharge or reuse. The polymers that suit each are different.
Foundry sand and scale
Sand-reclamation and quench water carry fine sand, clay binder and iron scale. Without help these settle slowly and wear pumps and nozzles. A small dose of Anionic HQ at the settling-pit inlet clears the water within minutes and leaves a compact sludge that is easy to remove.
Textile processing effluent
Mills that dye and finish yarn or fabric discharge coloured, alkaline effluent. The usual order is coagulation, SunDec SC05 for colour, then a cationic grade such as Cationic HQ to settle the combined floc.
City water and the monsoon
Water from the Siruvani and Pilloor schemes is usually clear, which means the coagulant and polymer doses are low for much of the year. When the south-west monsoon brings turbid water, the dose must rise quickly; daily jar tests during this period prevent poor clarifier performance.
Machining coolants
Spent cutting fluids are oily emulsions that need splitting before the water can be treated. After the emulsion is broken, a cationic grade helps separate the oil and solids.
Getting started
Units are regulated by the Tamil Nadu Pollution Control Board. Send us a sample from your pit, clarifier inlet or equalisation tank for a free jar test.
Not sure which grade suits your water?
Send us a one-litre sample or describe your process. We test it in our lab free of charge and recommend a grade and starting dose, and quote within 1 business hour.