Page 510 - Materials Chemistry, Second Edition

CAT3525_C15.qxd 1/27/2005 12:40 PM Page 481
Incineration of Hazardous Wastes 481

Tier II Tier III
Tier II monitoring involves Tier III monitoring involves limiting
limiting stack emissions of the risks that hydrogen chloride,
hydrogen chloride, chlorine gas, and metals will pose
chlorine gas, and metals to the surrounding environment

Tier I

Tier I monitoring involves
limiting the hourly waste
feed rate of hydrogen
chloride gas, and metals

FIGURE 15.1 Performance standards for hydrogen chloride, chlorine gas, and metals (U.S. EPA, 2002).

dry standard cubic meter) (0.08 grains per dry standard cubic foot) according to the formula (40
CFR Part 264)

P P 14 / (21 Y) (15.5)
c
m
where P is the corrected concentration of particulate matter, P the measured concentration of
c
m
particulate matter, and Y the oxygen concentration in stack gas.
EXAMPLE 15.1

A waste mixture consisting of benzene, xylene, and chlorophenol is being incinerated. The incin-
erator temperature is 1075°C and the stack gas flow rate is 410.82 dscm/min. Waste feed rate is
given in the table below. Determine if the unit is in compliance for each compound.

Compound Inlet Outlet
(kg/h) (kg/h)
Benzene (C H 6 ) 245 0.015
6
H ) 442 0.061
Xylene (C 8 10
Chlorobenzene (C H OCl) 235 0.149
6
5
HCl — 1.1
Particulates at 8.5% O 2 — 2.775
SOLUTION
(a) Calculate the DRE for each of the POHCs:

DRE (W W ) / W 100%
out
in
in
Benzene DRE (245 0.015) / 245 100 99.9939%
Xylene DRE (442 0.041) / 442 100 99.9907%
Chlorobenzene DRE (235 0.129) / 235 100 99.945%