NR 440.45(4)(a)(a) On and after the date on which the performance test required to be conducted by s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere:

NR 440.45(4)(a)1.1. From any digester system, brown stock washer system, multiple-effect evaporator system or condensate stripper system, any gases which contain TRS in excess of 5.0 ppm by volume on a dry basis, corrected to 10% oxygen, unless one of the following conditions is met:

NR 440.45(4)(a)1.b.b. The gases are combusted in a recovery furnace subject to the provisions of subd. 2. or 3.

NR 440.45(4)(a)1.c.c. The gases are combusted with other waste gases in an incinerator or other device, or combusted in a lime kiln or recovery furnace not subject to the provisions of this section, and are subjected to a minimum temperature of 650° C (1200° F) for at least 0.5 second.

NR 440.45(4)(a)1.d.d. It has been demonstrated to the department’s satisfaction by the owner or operator that incinerating the exhaust gases from a new, modified or reconstructed brown stock washer system in an existing facility is technologically or economically not feasible. Any exempt system shall become subject to the provisions of this section if the facility is changed so that the gases can be incinerated.

NR 440.45(4)(a)1.e.e. The gases from the digester system, brown stock washer system or condensate stripper system are controlled by a means other than combustion. In this case, these systems may not discharge any gases to the atmosphere which contain TRS in excess of 5.0 ppm by volume on a dry basis, uncorrected for oxygen content.

NR 440.45(4)(a)1.f.f. The uncontrolled exhaust gases from a new, modified, or reconstructed digester system contain TRS less than 0.0050 g/kg air dried pulp (0.010 lb/ton air dried pulp).

NR 440.45(4)(a)2.2. From any straight kraft recovery furnace any gases which contain TRS in excess of 5.0 ppm by volume on a dry basis, corrected to 8% oxygen.

NR 440.45(4)(a)3.3. From any cross recovery furnace any gases which contain TRS in excess of 25 ppm by volume on a dry basis, corrected to 8% oxygen.

NR 440.45(4)(a)4.4. From any smelt dissolving tank any gases which contain TRS in excess of 0.016 g/kg black liquor solids, as H2S (0.033 lb/ton black liquor solids, as H2S).

NR 440.45(4)(a)5.5. From any lime kiln any gases which contain TRS in excess of 8.0 ppm by volume on a dry basis, corrected to 10% oxygen.

NR 440.45(5)(a)(a) Any owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate the following continuous monitoring systems:

NR 440.45(5)(a)1.1. A continuous monitoring system to monitor and record the opacity of the gases discharged into the atmosphere from any recovery furnace. The span of this system shall be set at 70% opacity.

NR 440.45(5)(a)2.2. Continuous monitoring systems to monitor and record the concentration of TRS emissions on a dry basis and the percent of oxygen by volume on a dry basis in the gases discharged into the atmosphere from any lime kiln, recovery furnace, digester system, brown stock washer system, multiple-effect evaporator system, or condensate stripper system, except where the provisions of sub. (4) (a) 1. c. or d. apply. These systems shall be located downstream of the control devices and the spans of these continuous monitoring systems shall be set:

NR 440.45(5)(a)2.a.a. At a TRS concentration of 30 ppm for the TRS continuous monitoring system, except that for any cross recovery furnace the span shall be set at 50 ppm.

NR 440.45(5)(b)(b) Any owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate the following continuous monitoring devices:

NR 440.45(5)(b)1.1. For any incinerator, a monitoring device which measures the combustion temperature at the point of incineration of effluent gases which are emitted from any digester system, brown stock washer system, multiple-effect evaporator system, black liquor oxidation system or condensate stripper system where the provisions of sub. (4) (a) 1. c. apply. The monitoring device shall be certified by the manufacturer to be accurate within ± one percent of the temperature being measured.

NR 440.45(5)(b)2.2. For any lime kiln or smelt dissolving tank using a scrubber emission control device:

NR 440.45(5)(b)2.a.a. A monitoring device for the continuous measurement of the pressure loss of the gas stream through the control equipment. The monitoring device shall be certified by the manufacturer to be accurate to within a gauge pressure of ± 500 pascals (ca. 2 inches water gauge pressure).

NR 440.45(5)(b)2.b.b. A monitoring device for the continuous measurement of the scrubbing liquid supply pressure to the control equipment. The monitoring device shall be certified by the manufacturer to be accurate within ± 15% of design scrubbing liquid supply pressure. The pressure sensor or tap shall be located close to the scrubber liquid discharge point. The department may approve alternative locations.

NR 440.45(5)(c)(c) Any owner or operator subject to the provisions of this section shall, except where the provisions of sub. (4) (a) 1. d. or 4. apply, perform the following:

NR 440.45(5)(c)1.1. Calculate and record on a daily basis 12-hour average TRS concentrations for the 2 consecutive periods of each operating day. Each 12-hour average shall be determined as the arithmetic mean of the appropriate 12 contiguous one-hour average total reduced sulfur concentrations provided by each continuous monitoring system installed under par. (a) 2.

NR 440.45(5)(c)2.2. Calculate and record on a daily basis 12-hour average oxygen concentrations for the 2 consecutive periods of each operating day for the recovery furnace and lime kiln. These 12-hour averages shall correspond to the 12-hour average TRS concentrations under subd. 1. and shall be determined as an arithmetic mean of the appropriate 12 contiguous one-hour average oxygen concentrations provided by each continuous monitoring system installed under par. (a) 2.

NR 440.45(5)(c)3.3. Using the following equation, correct all 12-hour average TRS concentrations to 10 volume percent oxygen, except that all 12-hour average TRS concentrations from a recovery furnace shall be corrected to 8 volume percent oxygen instead of 10%, and all 12-hour average TRS concentrations from a facility to which the provisions of sub. (4) (a) 1. e. apply may not be corrected for oxygen content: