Page 186 - Wastewater Solids Incineration Systems

Emission Control and Monitoring 153

FIGURE 7.6 A Venturi scrubber with plume bob damper and tray scrubber (courtesy
of Swemco International, Inc., New York, U.S.A.).

1983). The relationships shown in Figure 7.9 can be used as an initial estimation of
Venturi pressure required as a function of particle size and removal efficiency. To
meet the NSPS for incinerators (0.65 g/kg [1.3 lb/ton] of solids incinerated), a pres-
sure drop of 5 to 7.5 kPa (20 to 30 in water column [w.c.]) across the Venturi, followed
by an additional 2.5 kPa (10 in w.c.) across the tray scrubber, for a total of 7.5 to 10 kPa
(30 to 40 in w.c.) across the complete wet scrubbing system is typically required.
Some incinerator installations can meet the incentive standard (0.37 g/kg [0.75
3
lb/dry ton]) with the above pressure drops. Liquid flow rates of 1.4 to 1.6 L/m (10
to 12 gpm/1000 acfm) are typically used.