Waste water treatment from Electroplating Industries
Sources: surface cleaning, pickling, stripping, electroplating, contribute alkali waste containg NaOH, carbonates, silicates wetting, greases and organic emulsifiers. Electroplating bath contains Cu, Ni, Ag, Zn, Cd, Cr, Sn, Pb, Fe etc.
Characteristics
i. The waste water contain some solvent such as trilene, benzene, petrol, aldehyde etc.
ii. It contain unused acids.
iii. It contains oil, greases as contaminant.
iv. It contain biodegradable solids.
v. It contain suspended solids.
vi. It has bad odour.
Bad Effects
i. Plating effeluent are highly toxic and corrosive.
ii. The toxicity of chemicals to microorgsnisms inhibits self purification properly of the stream.
iii. Fe, Sn etc. impart colour to the receiving stream.
iv. Phosphates and nitrates present in the effluent help in excessive algal growth.
v. Colloidal and suspended impurities impart unaesthetic appearance to the stream.
How to Treatment those
i. Segregation of cyanide wastes, chromium, wastes and other toxic metals bearing wastes.
ii. Treatment of cyanide waste by alkaline chlorination.
iii. Treatment of chromium bearing effluent.
iv. After the treatment of cyanide and chromium waste setting down the precipitation. Then the sludge may be dried on sand and disposed in landfills.
v. Scraping of the floating oils and greases from holding task.
vi. The rinse water may be reused after removing the ionic impurities.
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