Madurai water works and industrial effluent: a guide
How Madurai's Vaigai-fed water works and its textile, rubber and food units use coagulant and polymer, with tips for small plants.
City water from the Vaigai
Raw water from the Vaigai dam varies with the season: low and fairly clear in dry months, turbid when the river runs after rain. Clarifiers use alum or PAC followed by a small dose of an anionic polymer such as Anionic MQ or Anionic HQ.
Dose follows the river
Because raw water quality changes, the right dose changes too. A daily jar test during river flows, and a weekly one in dry months, keeps the clarifier steady without wasting polymer.
Small dye houses
Madurai's small dyeing and printing units discharge coloured effluent. SunDec SC05 removes dissolved dye, and a cationic Sunfloc grade then settles the solids.
Rubber and food units
Latex processing and food plants in the Kappalur and Uchapatti estates produce organic effluent. Cationic grades, or the liquid SunMac SC04 for small plants, help separate solids before biological treatment.
Small-plant tips
Small ETPs often make up polymer by hand. Use a wetting funnel or eductor, sprinkle granules slowly, mix gently for 45 to 60 minutes, and use the solution within a day.
Regulation and supply
Units are regulated by the Tamil Nadu Pollution Control Board. Madurai is about a day by road from Chennai.
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