Method and apparatus for biological treatment of spent caustic

Details Method and apparatus for biological treatment of spent caustic Method and apparatus for biological treatment of spent caustic

C - Chemistry, Metallurgy

02

F

C02F 3/00 (2006.01)

Patent

CA 2713265

The invention provides a method and apparatus for biologically treating a spent caustic to provide a treated spent caustic, said method comprising the steps of: (a) passing a spent caustic stream (25) comprising water, alkali metal hydroxide and sulphide to a first bioreactor (30); (b) biologically oxidising sulphide in the first bioreactor (30) with sulphide-oxidising bacteria to form sulphur (S0) and sulphate to provide a partially oxidised spent caustic comprising sulphur (S0) and sulphate; (c) passing the partially oxidised spent caustic to a second bioreactor (40) where at least a portion of the partially oxidised spent caustic is further oxidised with sulphide-oxidising bacteria to generate sulphate from sulphur (S0) to provide a treated spent caustic comprising sulphate.

L'invention porte sur un procédé et sur un appareil pour traiter biologiquement un produit caustique usagé afin d'obtenir un produit caustique usagé traité, ledit procédé comprenant : (a) le passage d'un courant de produit caustique usagé (25) comprenant de l'eau, un sulfure et un hydroxyde de métal alcalins vers un premier bioréacteur (30) ; (b) l'oxydation biologique du sulfure dans le premier bioréacteur (30) avec des bactéries d'oxydation de sulfure afin de former du soufre (S0) et un sulfate afin de produire un produit caustique usagé partiellement oxydé comprenant du soufre (S0) et un sulfate ; (c) le passage du produit caustique usagé partiellement oxydé vers un second bioréacteur (40), où au moins une partie du produit caustique usagé partiellement oxydé est encore davantage oxydée avec des bactéries d'oxydation de sulfure afin de générer un sulfate à partir du soufre (S0) de façon à produire un produit caustique usagé traité comprenant un sulfate.

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