Process for biological removal of sulphide

B - Operations – Transporting – 01 – D

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B01D 53/84 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2273007

The invention provides a process for the removal of sulphides, including hydrogen sulphide, carbonyl sulphide and carbon disulphide, from a gas stream by scrubbing the gas with an aqueous washing liquid and treating the washing liquid with sulphide-oxidising bacteria in the presence of an electron acceptor and reusing the treated liquid as a washing liquid, wherein the scrubbing and the bacterial treatment are carried out in the same reactor and nitrate is used as the electron acceptor. The process is especially useful for desulphurising gas at high pressure, such as natural gas.

Cette invention concerne un procédé permettant d'éliminer des sulfures contenus dans un flux de gaz, tels que du sulfure d'hydrogène, du sulfure de carbonyle et du disulfure de carbone. Ce procédé consiste tout d'abord à laver le gaz à l'aide d'un liquide de lavage aqueux. Le liquide de lavage est ensuite traité à l'aide de bactéries oxydant les sulfures et en présence d'un accepteur d'électrons, après quoi le liquide traité peut être réutilisé en qualité de liquide de lavage. Le lavage et le traitement bactérien se font dans un même réacteur, du nitrate étant utilisé en qualité d'accepteur d'électrons. Ce procédé est particulièrement utile dans la désulfuration de gaz à haute pression tel que du gaz naturel.

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