Cruceru, MihailMihailCruceruCraiu, CornelCornelCraiuToader, FeliciaFeliciaToader2017-04-202017-04-201982-11-30Patent no. RO 80585-Ahttp://hdl.handle.net/123456789/873Patent Assignee Name(s) and Code(s): INST EPURAREA APELOWaste waters and gases contaminated with divalent S cpds. are purified by treatment with an inorganic Cu, Fe and Ni salt catalyst in ratio 0.01-10: 0.15-15:05, expressed in g/l, at NTP, for 30-60 mins. The recovered catalyst is then recycled. Before contact with catalyst, residual waters are set to pH 3.5-6.5 with H2SO4. After contact, they are basified with alkaline hydroxides at pH 7-10 and decanted.en-USWastewater treatmentDivalent sulphPollutionDi:valent sulphur cpd. -contaminated waste water and gas purificn. - by contact with inorganic copper, iron and nickel salt catalystProcedeu de epurare a apelor reziduale si a gazelor impurificate cu compusi de sulf bivalentPatent