Pune auto and engineering ETPs: a guide
How vehicle, component and engineering plants in Pune's Chakan, Pimpri-Chinchwad and Ranjangaon belts treat metal-finishing and paint-shop effluent.
The auto belt
Chakan, Pimpri-Chinchwad, Talegaon and Ranjangaon host vehicle makers and hundreds of component suppliers. Their effluent comes mainly from degreasing, phosphating, electro-coating, painting and machining.
Pre-treatment and phosphating
Degreasing baths add oil and surfactants, and phosphating rinses add zinc, nickel, manganese and phosphate. After pH correction the metals and phosphate come out as fine precipitates, which an anionic grade such as Sunfloc Anionic HQ gathers into fast-settling flocs.
Paint shops
Paint-booth water collects overspray that must be detackified before it can be separated. A polymer then helps float or settle the paint sludge so it can be skimmed and pressed.
Machining coolants
Spent cutting fluids are oily emulsions. Once the emulsion is split, a cationic polymer helps separate the oil and fine solids before the water joins the main ETP.
Sugar and food in the district
Outside the city, sugar mills and distilleries run on the cane season, and food plants run all year. Mill effluent clarifies with anionic grades; organic food and distillery streams need cationic polymer or the liquid SunMac SC04.
Regulation and supply
Units are regulated by the Maharashtra Pollution Control Board. Road freight from Chennai usually takes about three days.
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