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268 Lawrence K. Wang et al.

Table 20
Hydrogen Sulfide Absorption Using Packed Tower Wet Scrubbers with Various
Diameters
Airflow rate Tower diameter Gas velocity Removal Liquid flux HTU
2
(acfm) (ft) (ft/min) (%) (gpm/ft ) (ft)
90,000 12 796 99.9+ 6.0 1.18
75,000 11 790 99.9+ 6.0 1.19
60,000 10 764 99.9+ 6.0 1.20
50,000 9 786 99.9+ 6.0 1.19
40,000 8 796 99.9+ 6.0 1.18
30,000 7 780 99.9+ 6.0 1.19
22,000 6 778 99.9+ 6.0 1.19
15,000 5 764 99.9+ 6.0 1.20
10,000 4 796 99.9+ 6.0 1.18
Note: Design considerations: H S removal efficiencies: >99.9%; temperature: 80°F at sea level; height
2
of packed bed: 10 ft.
Source: ref. 36.

Table 21
Scrubbing H S for 99.9% Removal
2
2
V (ft/min) L (gpm/ft ) Pressure drop (in. WC/ft) HTU (ft) Bed height (ft)
G
800 8 0.379 0.954 8.00
800 6 0.341 1.071 9.00
800 4 0.306 1.242 10.00
700 8 0.257 0.981 8.00
700 6 0.234 1.089 9.00
700 4 0.213 1.278 10.00
600 8 0.171 0.972 8.00
600 6 0.158 1.080 9.00
600 4 0.146 1.269 10.00
500 8 0.113 0.936 7.50
500 6 0.106 1.044 8.50
500 4 0.099 1.215 10.00
400 8 0.073 0.864 7.00
400 6 0.069 0.963 8.00
400 4 0.066 1.125 9.50
300 8 0.046 0.774 6.50
300 6 0.044 0.864 7.00
300 4 0.042 1.008 8.00
200 8 0.027 0.648 5.00
200 6 0.026 0.720 6.00
200 4 0.026 0.837 7.00

Note: Scrubbing solution: 0.1% caustic and 0.3% hypochlorite; pH 9.0–9.5; ORP 500–600 mV; tem-
perature 80°F.
Source: ref. 36.