Process for managing sulphur species

A method of removing a sulphur-containing species from a sour liquid, said method comprising:

• (a) providing the sour liquid comprising the sulphur-containing species, wherein the sulphur-containing species is hydrogen sulphide, an alkyl-thiol, an aryl-thiol, a substituted-alkyl-thiol, or a substituted-aryl-thiol;
• (b) introducing a halogen-based catalyst to the sour liquid, wherein the halogen-based catalyst is complexed with a second species selected from the group consisting of an ethoxylate species, a propoxylate species, and a combination thereof;
• (c) introducing an oxidant to the sour liquid, wherein the oxidant is a peroxide;
• (d) reacting the sulphur-containing species, the halogen-based catalyst and the oxidant, thereby forming a disulphide product, wherein the halogen-based catalyst oxidizes the sulphur-containing species to form a spent catalyst, and wherein the oxidant oxidizes the spent catalyst to regenerate the halogen-based catalyst;
• and
• (e) introducing a surfactant to the sour liquid to control the hydrophilic-lipophilic balance of the sour liquid.