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Gas-Phase Biofiltration 437

Table 10
Parameters Monitored During Full-Scale Operation
Overall Influent mean Effluent mean Overall
Parameter removal (ppm) (ppm) average
VOCs 65% 32 11 n/a
H S 100% a 0.5 0 n/a
2
NH 100% 14 0 n/a
3
6
Solid-support microorganisms n/a n/a n/a 3.1 × 10 CFU/g
Solid-support moisture content n/a n/a n/a 29% b
pH of Solid support n/a n/a n/a 6.9
Airflow rate n/a n/a n/a 46,500 cfm
Influent air relative humidity n/a n/a n/a 99+%
Influent air temperature n/a n/a n/a 52–85ºF c
TBRT n/a n/a n/a 40 s
a Very low concentrations of H S.
2
b 90% of water holding capacity of the solid support.
c Temperature range; largely dependent on season.

Fig. 4. Load versus elimination curve. The difference between the elimination capacity and
the loading of the system is the RE of the system. (From G. Kleinheinz, unpublished.)

Menasha Utility District, and Town of Neenah Sanitary District. Major industrial
contributors to the plant include U.S. Papers, Gilbert Papers, Galloway Dairy, and 20
pretreatment regulated industries. The treatment facility is located on the shore of Little
Lake Butte des Morts and is surrounded on the remaining three sides by residential
homes and a city park. Approximately 100 homes are within a 500-ft radius of the
facility. The facility was originally constructed in the 1930s. Shortly after start-up of
an expanded facility in 1986, residents began complaining about odors. In 1990, the