 |
|
TABLE 2:Typical reduced sulfur gas concentrations from kraft pulp mill sources
|
Concentration (ppm by Volume)
|
|
Emission Source
|
H2S |
CH3SH |
CH3SCH3 |
CH3SSCH3 |
|
Digester, batch
Blow, Gases
Relief Gases
|
0-1,000
0-2,000
|
0-10,000
10-5,000
|
100-45,00
100-60,000
|
10-10,000
100-60,000
|
| Digester, Continuous |
10-300 |
500-10,000 |
1,500-7,500 |
500-3,000 |
| Washer hood vent |
0-5 |
0-5 |
0-15 |
0-3 |
| Washer seal tank |
0-2 |
10-50 |
10-700 |
1-150 |
| Evaporator hotwell |
600-9,000 |
300-3,000 |
500-5,000 |
500-6,000 |
| Black liquor oxidation tower exhaust |
0-10 |
0-25 |
10-500 |
2-95 |
| Recovery furnace (after direct contact evaporation) |
0-1,500 |
0-200 |
0-100 |
2-95 |
| Smelt-dissolving tank |
0-75 |
0-2 |
0-4 |
0-3 |
| Lime kiln exhaust |
0-250 |
0-250 |
0-50 |
0-20 |
| Lime slaker vent |
0-20 |
0-1 |
0-1 |
0-1 |
|