Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 128
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146 Introduction
KRAFT PULP MILLS - SUBPART BB
§60.280 - 60.285
The facIlities of a kraft pulp mill covered under this subpart are:
di-
gester system, brown stock washer system, multiple-effect evaporator system,
black liquor oxidation system, recovery furnace, smelt dissolving tank, lime
kiln, and condensate stripper system.
In pulp mills where kraft pUlping is
combined with neutral sulfite semi-chemical pulping, the provisions of this
9ubpart are applicable when any portion of the material charged to an affected
facility is produced by the kraft pulping operation.
Facilities constructed,
reconstructed or modified after September 24, 1976, are covered by the
regulation.
A particulate emission limit of 0.10 g/dscm (0.044 gr/dscf) corrected to
8 percent oxygen and an opacity of less than 35 percent have been set for the
recovery furnace.
Emissions from the smelt dissolving tank are limited to
0.1 g/kg black liquor solids (dry weight) or 0.2 lb/ton black liquor solids (dry
weight).
For the lime kiln, the limit is 0.15 g/dscm (0.067 gr/dscf) cor-
rected tolO percent oxygen when burning gaseous fossil fuel and 0.30 g/dscm
(0.13 gr/dacf) corrected to 10percent oxygen, when burning liquid fossil fuel.
Total reduced sulfur (TRS) means the sum of the sulfur compounds-hydrogen
sulflde, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide - which are
released during the kraft pulping operation.
An emission limit of 5 ppm of
TRS by volume on a dry basis corrected to 10 percent oxygen has been established
for the dlgester system, brown stock washer system, multiple-effect evaporator
system, hlack liquor oxidation system and condensate stripper.
This emission
limit remains in effect unless one of the following conditions are met:
(1) the
gases are combusted in a lime kiln, (2) the gases are combusted in a recovery
furnace, (3) the gases Bre combusted with other waste ·gases in an incinerator
or other device not subject to the standard and are subjected to a minimum
temperature of 649
0
C (l200
0
F) for at least 0.5 second, (4) it has been demon-
strated to the administrator's satisfaction that incineration of TRS from the
black liquor oxidation system or brown stock washer system is technologically
or economically not feasible. or (5) the digester, brown stock washer, conden-
sate stripper or black liquor oxidation system are controlled by a means other
than combustion whereby TRS emissions do not exceed 5 ppm by volume on a dry
basis corrected to the actual oxygen content of the untreated gas stream.
1':miRsion limits of 5 ppm and 25 ppm TRS by volwne on a dry basis, cor-
n!cted to 8 percent oxygen have been established for any straight and cross
recovery furnaces respectively.
For the smelt dissolving tank, the.TRS emis-
sion limit has heen set at 0.0084 g/kg black liquor solids (dry weight) or
116
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