NORTHERN SONOMA COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 450 - SULFIDE EMISSION STANDARDS FOR KRAFT PULP MILLS
(a) Kraft Recovery Furnace
The emission of total reduced sulfur, TRS, from any kraft recovery furnace shall not exceed:
The daily and monthly arithmetic averages for TRS shall be based upon the actual hours of operation of burning liquor in the recovery furnace(s).
Effective February 1, 1989 the emission of total reduced sulfur, TRS, from any new or modified kraft recovery furnace shall not exceed 3 ppm of TRS, measured and reported in accordance with 40 CFR 60.284.
(b) Lime Kiln
The emission of total reduced sulfur, TRS, from any lime kiln shall not exceed 40 ppm of TRS or 0.20 pound of TRS per ton of kraft pulp mill production as a daily arithmetic average, whichever is the more restrictive condition.
(c) Other Kraft Mill Sources
The emission of total reduced sulfur, TRS, from other kraft mill sources shall not exceed 20 ppm of TRS or a cumulative value of 0.20 pound of TRS per ton of kraft pulp mill production as a daily arithmetic average, whichever is the more restrictive condition.
Notwithstanding these emission limits for other kraft mill sources, the gases from any smelt dissolving tank shall not contain TRS in excess of 0.0084 g/kg black liquor solids (0.0168 lb/ton black liquor solids) calculated on a dry basis. This corresponds approximately to 0.025 lb TRS per ton pulp production.
(d) Kraft Mill Non-Condensibles
A person shall not discharge non-condensibles into the atmosphere from any emission point, until said non-condensibles have been treated in an air pollution abatement operation for removal, thermal oxidation or chemical destruction of the TRS compounds contained therin. The net emission of non-condensibles from any such air pollution abatement operation shall not exceed a TRS concentration of 5 parts per million by volume except during periods when switching from one control system to another; which period or periods shall not aggregate more than 30 minutes in any one day.
(e) Kraft Mill Monitoring
Recording instruments to measure total reduced sulfur emissions shall be provided, installed, maintained and continuously operated by the owner in the exhaust stack from the kraft recovery furnace flue gas system, from the kraft pulp mill lime kiln and from all other emission points releasing in excess of 100 pounds of TRS per day into the atmosphere. The recording section of such instruments shall be installed in a location subject to frequent operator surveillance or equipped with suitable alarm devices.
(f) Compliance Verification
A summary of the data required to determine compliance with applicable provisions of this rule shall be submitted to the Control Officer once each calendar month no later than the fifteenth day of the following calendar month. This summary shall be presented in the manner and form as prescribed by the Control Officer.