Ludhiana dyeing and electroplating effluent
How Ludhiana's hosiery dye houses and electroplating units treat effluent for the city's common plants and the Buddha Nullah clean-up, and where polymer fits.
Why Ludhiana is under scrutiny
The Buddha Nullah carries Ludhiana's wastewater to the Sutlej, and its pollution has drawn sustained attention from courts and regulators. Dyeing and electroplating units are expected to treat effluent properly, and many dye houses now send it to common effluent plants.
Hosiery and yarn dyeing
Knitwear and yarn dyeing produce hot, coloured, salty effluent. After equalisation and coagulation, SunDec SC05 removes dissolved dye and Sunfloc Cationic HQ settles the floc.
Electroplating
Plating lines produce rinse water with nickel, chromium, zinc and copper, and sometimes cyanide. Chromium and cyanide streams are treated separately first; the metals then precipitate at alkaline pH, and an anionic grade such as Sunfloc Anionic HQ gathers them into flocs. See our electroplating effluent guide.
Forging and cycle parts
Forging, heat treatment and machining shops reuse water that collects scale and oily fines. Polymer in the settling pit keeps recirculated water clean and protects pumps.
Winter operation
Cold winters slow both coagulation and biological treatment. Doses often need to rise in December and January; check them by jar test as the water cools.
Regulation and supply
Units are regulated by the Punjab Pollution Control Board. Road freight from Chennai usually takes about six days, so keep stock on site.
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