Wastewater containing heavy metal ions and organic compounds from metal finishing process was treated by coagulation and filtration after pH adjustment. The treated water containing organic matter and salts was distilled under reduced pressure. The distilled water was deionized applying double-pass RO system after UF filtration. The permeated water of the first RO pass became the feed for second RO pass. The concentrated water of the second RO pass returned for UF filtered water tank. The permeated water was oxidized by ozone combined with ultraviolet (UV) radiation. The advantage of this combined process (RO treatment and ozone oxidation) is that there is no production of salts which should be removed before the treated water reused. The electric conductivity of the effluent from the UV-ozone process was less than 10 mu S/cm. This purified water could be reused as cooling water in the cooling tower facilities. Based on these experiments, we devised a practical recycling system by which water in contaminated wastewater can be reused as purified water on an industrial scale at a chemical processing factory. These results suggest that this process does not cause any secondary pollution, and has high possibility of being practically applied for recycling water from metal finishing process.