| 摘要 |
<p>Bayer 2858 LH/jc OXIDATION OF WASTE WATER CONTAINING SULPHIDE, SULPHITE AND/OR THIOSULPHATE 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 sulphide, is first brought into contact at a pH > 7 and a temperature of about 20 to 200.degree.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.degree.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 additionally being separated in the ease of waste water containing sulphide 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 bubble columns, each with a packed column downstream thereof. Le A 16 577</p> |
