In surface treatment processes we face a great problem when chromium is involved as it happens in zinc passivating, aluminium sealing, decorative chromium and hard chromium, and the emission of chromo oxide to the atmosphere. The European Union will completely ban the use of chromium hexavalent by the year 2007. This work shows how to purify a chromium bath through electrolytic recovery, anode-cathode and separating cell or membrane cell, using for this tanks and a transfer pump, rectifier, membrane cell and interchanging anodes. We also recuperate by electro-dialysis, washing and recovering it and using an evaporator to minimize environmental impact. In chromium emission to the atmosphere zero emission is achieve using EED (Emission Eliminating Device) that reduces energy's costs about 70-80%. Also we try to minimize chromium converting it into solid, liquid or gaseous state.
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