The air stream discharged from the sulphur melter contained high levels of both hydrogen sulphide and sulphur dioxide. The soild bed filter could not cope. The result was numerous odour complaints from neighbours.
A biological scrubber was installed to remove hydrogen sulphide from gas streams. Hydrogen sulphide removal efficiencies of over 97% were achieved within days of the installation. The hydrogen sulphide laden air is contacted with a scrubbing solution in a vessel packed with an inorganic support material that hosts microorganisms which aerobically degrade the absorbed hydrogen sulphide.
All complaints immediately ceased. Operating costs are minimal since the only "chemicals" needed are very small quantities of nutrients to ensure the health of the microorganisms.
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