Process for purifying sulphide-containing waste water

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/34 (2006.01) C01B 17/05 (2006.01)

Patent

CA 2164090

A process is described for purifying waste water containing sulphide, comprising oxidising the sulphide to elemental sulphur in a reactor with sulphide-oxidising bacteria in the presence of oxygen, and separating from the waste water at least a part of the sulphur formed during the oxidation, while recycling a part of the elemental sulphur separated from the reactor effluent into the reactor in such a way that a concentration of elemental sulphur of at least 1 g/l is maintained in the reactor. The sulphur, in the form of aggregates, is used as a carrier material for the sulphide-oxidising bacteria.

Est décrit un procédé pour purifier des eaux usées contenant du sulfure, consistant à oxyder le sulfure pour obtenir du soufre élémentaire dans un réacteur avec des bactéries oxydant le sulfure, en présence d'oxygène, et à séparer des eaux usées au moins une partie du soufre formé pendant l'oxydation, tout en recyclant dans le réacteur une partie du soufre élémentaire séparé des effluents du réacteur, de telle manière qu'une concentration de soufre élémentaire d'au moins 1g/l soit maintenue dans ce dernier. Le soufre, sous forme d'agrégats, s'utilise comme matériau de support pour les bactéries oxydant le sulfure.

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