Dear Mahesh, Electroplating ...

Dear Mahesh,

Electroplating industry consumes and discharge large volumes of wastewater.Use of various chemicals and metal salt creates pollution problems.Major pollution caused by rinse water, spray losses and solution dumping and leakages. Valuable metals and cyanide along with different chemicals used arelost in wastewater. The amount may be 2-20% of the chemicals used. Thereforegreater efforts shall be required to reduce the pollution problems. The effluent concentration depends on various factors such as surface area, shape of article thickness of solution, speed of removal, drain time etc. 

Following method to minimise electroplating waste,

1. COAGULATION AND PRECIPITATION
2. Treatment with ferrous sulphate
3. Treatment with sulphur dioxide
4. Treatment with sulphuric acid
5. Treatment with barium chromate
6. Alkaline chlorination treatment
7. Electrolytic decomposition method
8. Evaporation
9. Treatment with ozone

The applicability of all these techniques depends on the type and scale ofoperationAll these methods of recovery are directly related to economy ofthe system in certain cases it is economical to treat the effluent rather than try to recover the metal.