Process for biological removal of sulphide

摘要

The invention provides a process for the removal of sulphides 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 natural gas at high pressure. <IMAGE>