Biological treatment of spent caustics

C - Chemistry – Metallurgy – 02 – F

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C02F 3/34 (2006.01) C12S 99/00 (2010.01)

Patent

CA 2261882

A process for the biological treatment of a spent caustic solution containing sulphides is disclosed, wherein the solution is introduced into an aerobic reactor containing sulphide-oxidising bacteria, and the sulphides are partly converted to elemental sulphur and partly to sulphate by controlling the redox potential in the reactor at a value below -300 mV (against an Ag/AgCl reference electrode), or below -97 (against a H2 reference electrode). Also disclosed is process for the biological treatment of an aqueous solution containing sulphides and/or mercaptans in an aerobic reactor, wherein the solution is treated in the presence of bacteria of the new species Methylophaga sulfidovorans.

L'invention porte sur un procédé de traitement biologique d'une solution de caustique usé contenant des sulfures. On place ladite solution dans un réacteur aérobie contenant des bactéries qui oxydent le sulfure et on transforme les sulfures en partie en soufre en fleur et en partie en sulfate, en maintenant le potentiel d'oxydo-réduction dans le réacteur à une valeur inférieure à -300 mV (contre une électrode de référence Ag/AgCl), ou inférieure à -97 (contre une électrode de référence H¿2?). L'invention porte aussi sur un procédé de traitement biologique dans un réacteur aérobie d'une solution aqueuse contenant des sulfures et/ou des thiols, laquelle est traitée en présence de bactéries de la nouvelle espèce Methylophage sulfidovorans.

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