Laboratory of Electrochemical Research & Development, Integral Centre, Barcelona, Spain Waste process water has an important cost which should be minimized in a direct way to have a good quality water for chemical and electrolytic process. Water contaminants are: sales, carbonates, nitrates, nitrites, etc, jeopardise surface treatments. Flow membranes units of inverted osmosis are used. The ionic interchange units, ionic carbon interchange units and filtering with diatomaceous earths, etc is considered obsoletes. In the surface treatment process it is important both electrolytic and chemical, the water consumption should be reduce as much as possible. Baths contamination should be avoid by minimization of dragging when treating parts in barrel or tank. The use of chemical or manufactured products is basic in the resulting sludge. They minimize contamination and cations and anions migration by chemical reaction. Also, physical-chemical and biological purifying plants and recovery flow membranes and ultra-filtration units and evaporators are appropriated.
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