Raw biogas has produced many applic

Raw biogas has produced many applications.
However, its hydrogen sulfide content must be eliminated to avoid
possible damages to equipment and hazards to users and the
environment. Among the various set-ups available for removal of
hydrogen sulfide from biogas is a fixed-bed of steel wool.
This study investigated the effectiveness of iron steel wool in
eliminating hydrogen sulfide in a biogas, its efficacy and the amount
of H2S removed. A three-stage removal system was installed for the
removal of Hydrogen Sulfide. The raw gas was produced by a
continuous flow type Biogas Digester.
Testing the steel wool as an adsorbent indicates that it has
potential as an effective and economical adsorbent for H2
S removal.
Polyvinyl-chloride (PVC) columns were constructed and a biogas
mixture passed through the columns containing the steel wool. The
most significant results indicate the intake H2
S concentrations
averaging 170 ppm – 150 ppm and 0 ppm – 0.1 ppm output, as
measured by a portable hydrogen sulfide gas analyzer.
Removal efficiencies over 95% were observed for a majority of the
run time. Elimination capacities recorded were between 3-4 Standard
liters per minute (SLPM). Temperature in the system varied from 26-27°C and the relative humidity in the spent column was above 90%.
The removal of Hydrogen Sulfide in a biogas demonstrated good
performance throughout the testing phase. Based on the field
measurements, the system required only a few days for startup. The
desulfurization systems, under normal operating conditions, had
reduced 170 ppm of H
2
S to 0 ppm with accuracy of ± 0.1ppm