Process for the removal of sulfur dioxide from waste gas
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United States of America Patent
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Mar 23, 1993
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app pub date -
Apr 12, 1991
filing date -
Apr 12, 1990
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Abstract
The invention provides a process for the removal of sulfur dioxide from waste gas, comprising the steps of: a) contacting the waste gas with a basic aqueous solution wherein sulfur dioxide is dissolved as sulfite; b) subjecting the aqueous solution containing sulfite to sulfur reducing bacteria in an anaerobic reactor wherein sulfite is reduced to sulfide; c) subjecting the aqueous solution containing sulfide to sulfur oxidizing bacteria in the presence of a limiting amount of oxygen in a reactor wherein sulfide is oxidized to elemental sulfur; d) separating the elemental sulfur form the aqueous solution; and e) recycling the aqueous solution to step a).
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