Sulphur reducing bacterium and its use in biological...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 1/20 (2006.01) B01D 53/48 (2006.01) C01B 17/05 (2006.01) C02F 3/34 (2006.01) C12S 5/00 (2006.01)

Patent

CA 2261287

A new sulphur-reducing bacterium denoted as KT7 is described. It is a low-GC Gram-positive bacterium related to the genus Desulfoto-maculum, capable of reducing sulphite and sulphate to sulphide, having an optimum growth at a temperature between 48 and 70 ~C, at a pH of between 5 and 9 and at a conductivity of the liquid medium between 0 and 40 mS/cm. It can be used in a process for removing sulphur compounds from water, wherein the sulphur- containing water is subjected to anaerobic treatment with the new sulphur- reducing bacteria, with the addition of an electron donor. The sulphur- containing water can be spent scrubbing liquid from a flue gas desulphurisation step.

La présente invention a pour objet une nouvelle bactérie de réduction du soufre, désignée KT7. Il s'agit d'une bactérie Gram positif à faible teneur en GC, apparentée au genre Desulfoto-maculum. Elle est capable de réduire en sulfure le sulfite et le sulfate, sa croissance maximale a lieu à une température comprise entre 48 et 70 ·C, à un pH compris entre 5 et 9, et avec une conductivité du milieu liquide de 0 à 40mS/cm. Cette nouvelle bactérie peut être utilisée dans le procédé qui consiste à extraire les composés de soufre contenus dans l'eau, procédé dans lequel l'eau contenant du soufre est soumise à un traitement anaréobique avec les nouvelles bactéries de réduction du soufre, avec adjonction d'un électrodonneur. L'eau contenant du soufre peut être un liquide de lavage ayant servi et provenant de la désulfuration de gaz de combustion.

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