Biological treatment of spent caustics.

A.J.H. Janssen (Inventor), C. Buisman (Inventor), G. Lettinga (Inventor), G. van Straten (Inventor), J. Bontsema (Inventor), J.G. Kuenen (Inventor), J.M.M. de Zwart (Inventor)

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Abstract

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
Original languageEnglish
Patent numberWO9804503
Priority date29/07/96
Publication statusPublished - 29 Jul 1996

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Janssen, A. J. H., Buisman, C., Lettinga, G., van Straten, G., Bontsema, J., Kuenen, J. G., & de Zwart, J. M. M. (1996). Biological treatment of spent caustics. (Patent No. WO9804503).