9VAC5-40-1690: Standard for total reduced sulfur

A. No owner or other person shall cause or permit to be discharged into the atmosphere from any kraft wood pulping operation unit specified below any total reduced sulfur emissions in excess of the following limits:

1. Recovery furnaces.

a. Old design furnaces -- 20 ppm by volume on a dry basis, corrected to 8.0% oxygen.

b. New design furnaces -- 5 ppm by volume on a dry basis, corrected to 8.0% oxygen.

c. Cross recovery furnaces -- 25 ppm by volume on a dry basis, corrected to 8.0% oxygen.

2. Digester systems -- 5 ppm by volume on a dry basis, corrected to 10% oxygen.

3. Multiple-effect evaporator systems -- 5 ppm by volume on a dry basis, corrected to 10% oxygen.

4. Lime kilns -- 20 ppm by volume on a dry basis, corrected to 10% oxygen.

5. Condensate stripper systems -- 5 ppm by volume on a dry basis, corrected to 10% oxygen.

6. Smelt dissolving tanks -- 0.033 pounds per ton black liquor solids as H2S.

B. Achievement of the emission standards in this section by use of methods in 9VAC5-40-1700 will be acceptable to the board.