Background:
Different packing materials are used in wet scrubbers that each one has its own
advantages and limitations. Common ceramic packing materials have high removal
efficiency but they are heavy,
fragile and high head loss along the bed. Finding a suitable replacement for
these materials has always been concerned by researchers. The objective of the present study was to
compare the ammonia removal efficiency from air by a wet scrubber packed with
ceramic raschig rings and PVC.
Methods: A
laboratory scale column was randomly packed in 30 cm depth with ceramic raschig
rings as well as PVC. Ammonia laden air was injected into the column at three
air flow rates including 5, 10 and 15 lit/s. Ammonia gas was applied to the
column in three concentration ranges including 23-26, 40.2-43.7 and 55-60 PPM
using water scrubbing liquid.
Results: The result of 54
experiments revealed that the efficiency of column packed with raschig rings
was higher than the efficiency of column packed with PVC in all three studied
air flow rates. The removal efficiency of column increased significantly in
both packing (P<0.001) as the inlet concentration of ammonia gas was
increased. The head loss across the bed was significantly increased (P<0.001)
as air flow rate was increased from 5 to 10 and 10 to 15 lit/s.
Conclusion: PVC can be considered as a
suitable substitute for ceramic raschig rings in wet packed scrubbers.
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