Towards an odour control system combining slurry sorption and electrochemical regeneration

It was demonstrated that ethanethiol could be continuously removed from a gas stream with a unit that combined slurry sorption with in-stream regeneration of the adsorbent for re-use. The regeneration process led to the electrochemical oxidation of adsorbed species and the restoration of the adsorbe...

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Bibliographic Details
Published in:Chemical engineering science 2012-09, Vol.79, p.219-227
Main Authors: Conti-Ramsden, Michael G., Brown, Nigel W., Roberts, Edward P.L.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Applied sciences
Chemical engineering
chlorine
Current density
Electrochemistry
electrodes
Ethanethiol
Exact sciences and technology
Gas streams
Heat and mass transfer. Packings, plates
Mass transfer
odor control
Oxidation
Reactors
Regeneration
Slurries
Sorption
sulfates
Sulfur
surface area
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Summary:It was demonstrated that ethanethiol could be continuously removed from a gas stream with a unit that combined slurry sorption with in-stream regeneration of the adsorbent for re-use. The regeneration process led to the electrochemical oxidation of adsorbed species and the restoration of the adsorbent's active surface area. The unit was tested with a 22.4lmin−1 challenge gas stream containing 100ppm ethanethiol and operated at current densities ranging from 0 to 4mAcm−2. Removal of ethanethiol varied with applied current and reached 69% removal at 4mAcm−2. In this system, it was shown that mass transfer by chemical reaction with free chlorine generated in the anode was the dominant effect with physical mass transfer modelled as only contributing between 2.5% and 9% removal. It was demonstrated by mass balance that the gaseous sulfur challenge component removed was transferred into the aqueous phase by the system and the sulfur removed persisted in this aqueous phase most probably in the form of thiosulfinates, thiosulfonates and sulfates. ► Adsorption and electrochemical regeneration were combined in a gas treatment unit. ► A current density of 4mAcm−2 removed 69% of 100ppmv ethanethiol gas over time. ► 2.5–9% removal was attributed to adsorption, the rest to reaction with chlorine. ► The removed sulfur was shown to persist in the aqueous phase.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2012.05.049