Process for the removal of sulphur compounds from gases
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
May 26, 1993
filing date -
Dec 4, 1990
priority date (Note) -
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Abstract
A process for the removal of sulphur compounds from a gaseous effluent, comprising the steps of: a) contacting the gaseous effluent with an aqueous solution wherein sulphur compounds are dissolved; b) adjusting the concentration of buffering compounds such as carbonate and/or bicarbonate and/or phosphate in the aqueous solution to a value between 20 and 2000 meq/l; c) subjecting the aqueous solution containing sulphide to sulphide-oxidizing bacteria in the presence of oxygen in a reactor wherein sulphide is oxidized to elemental sulphur; d) separating elemental sulphur from the aqueous solution; and e) recycling the aqueous solution to step a). This process is suitable for removing H.sub.2 S from biogas, ventilation air etc. It can be used for removing SO.sub.2 from combustion gases by introducing the additional step, after step a) and before step c), of subjecting the aqueous solution containing the sulphur compounds to a reduction of the sulphur compounds to sulphide. H.sub.2 S and SO.sub.2 removal is further enhanced by a residual sulphur content in the washing liquid of 1-50 g/l.
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