The selective removal of H2S over CO2 was increased by around
50% in a bubble column by altering the gas holdup in the reactor
and relying on the slower H2CO3 reaction to resist CO2
absorption.
The G/L ratio, at 95% H2S removal, increased as a result of a
decrease in the alkaline effluent height and an increase the
superficial gas velocity.
From countercurrent experiments, relatively high removal efficiency
of >90% was achieved at a slightly lower G/L ratio (15:1)
of an agricultural digester. If the initial concentration of H2S in
the biogas was reduced to lower levels (e.g. 0.01–0.05%), via
oxygen dosing in the digester, the authors believe complete
removal of H2S could be possible at the targeted G/L ratios of
22–25:1.
The bubble column reactor is an attractive absorption apparatus
in this application due to its ability to handle low solids with
ease that are known to be contained in dairy effluent.
Whereas, in other apparatuses, such as a packed bed, suspended
solids can negatively affect performance and cause clogging
issues. This process could be a very attractive solution for the
front-end reduction of H2S prior to other removal techniques
for CO2 (e.g. water scrubbing and pressure swing adsorption)
or as an effective technique to reduce H2S prior to combusting
biogas in an engine.
The selective removal of H2S over CO2 was increased by around50% in a bubble column by altering the gas holdup in the reactorand relying on the slower H2CO3 reaction to resist CO2absorption. The G/L ratio, at 95% H2S removal, increased as a result of adecrease in the alkaline effluent height and an increase thesuperficial gas velocity. From countercurrent experiments, relatively high removal efficiencyof >90% was achieved at a slightly lower G/L ratio (15:1)of an agricultural digester. If the initial concentration of H2S inthe biogas was reduced to lower levels (e.g. 0.01–0.05%), viaoxygen dosing in the digester, the authors believe completeremoval of H2S could be possible at the targeted G/L ratios of22–25:1. The bubble column reactor is an attractive absorption apparatusin this application due to its ability to handle low solids withease that are known to be contained in dairy effluent.Whereas, in other apparatuses, such as a packed bed, suspendedsolids can negatively affect performance and cause cloggingissues. This process could be a very attractive solution for thefront-end reduction of H2S prior to other removal techniquesfor CO2 (e.g. water scrubbing and pressure swing adsorption)or as an effective technique to reduce H2S prior to combustingbiogas in an engine.
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