C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/11
C02F 1/72 (2006.01) C02F 11/08 (2006.01)
Patent
CA 1076273
Bayer 2858 LH/jc OXIDATION OF WASTE WATER CONTAINING SULPHIDE, SULPHITE AND/OR THIOSULPHATE Abstract of the Disclosure A process for the oxidation of waste water containing one or more of sulphide, sulphite and thiosulphate, with gases containing oxygen, wherein the waste water, if it contains sul- phide, is first brought into contact at a pH > 7 and a tempera- ture of about 20 to 200°C with oxygen-containing gases at from normal pressure up to about 20 bars, until the totality of the sulphide is substantially converted into thiosulphate, then reacted at a pH of approximately 0 to 5, or from 0 to 8 for a waste water containing only sulphite, and at a temperature of about 20 to 200°C with oxygen-containing gases at from normal pressure up to about 20 bars, optionally in the presence of a catalyst, until the practically complete formation of sulphate, with sulphur addition- ally being separated in the ease of waste water containing sul- phide and/or thiosulphate. The catalyst may comprise copper, cobalt and/or iron and be present in about 0.1 to 100 ppm of solution. Advantageously the oxidations are effected in bub- ble columns, each with a packed column downstream thereof. Le A 16 577
258299
Enders Reimund
Horak Otto
Muders Rolf
Schultz Peter
Wegner Peter
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