Removal of heavy metals in industrial waste water by electrochemical methods is certainly useful. Eletrowinning of Copper is one good example.  Even common sewage too is known to be contaminated with heavy metals. Electrochemical will be more useful.

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Removal of heavy metals in industrial waste water by electrochemical methods is certainly useful. Eletrowinning of Copper is one good example. 

Even common sewage too is known to be contaminated with heavy metals. Electrochemical will be more useful.