The invention relates to a process for treating a sulfide-containing waste lye from a lye scrub in which the waste lye and oxygen or an oxygen-containing gas mixture is fed to an oxidation reactor (10) and in the latter is subjected to a wet oxidation, steam being fed into the oxidation reactor (10). It is provided that an oxidation reactor (10) with a number of chambers (11-19), of which a first chamber (11) has a greater volume than a second chamber (12), is used, the waste lye and the oxygen or the oxygen-containing gas mixture being fed to the first chamber (11), fluid flowing out of the first chamber (11) being transferred into the second chamber (12), the steam quantity and/or steam temperature of the steam fed into the oxidation reactor (10) being controlled by a control device (TIC), and the steam fed into the oxidation reactor (10) being at least partially fed into the first chamber (11) and into the second chamber (12). A corresponding installation (100) and also a corresponding oxidation reactor (10) are likewise the subject of the invention.
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