NR 440.45(2)(e)(e) “Cross recovery furnace” means a furnace used to recover chemicals consisting primarily of sodium and sulfur compounds by burning black liquor which on a quarterly basis contains more than 7 weight percent of the total pulp solids from the neutral sulfite semichemical process and has a green liquor sulfidity of more than 28%. NR 440.45(2)(f)(f) “Digester system” means each continuous digester or each batch digester used for the cooking of wood in white liquor, and associated flash tanks, blow tanks, chip steamers and condensers. NR 440.45(2)(g)(g) “Green liquor sulfidity” means the sulfidity of the liquor which leaves the smelt dissolving tank. NR 440.45(2)(h)(h) “Kraft pulp mill” means any stationary source which produces pulp from wood by cooking or digesting wood chips in a water solution of sodium hydroxide and sodium sulfide (white liquor) at high temperature and pressure. Regeneration of the cooking chemicals through a recovery process is also considered part of the kraft pulp mill. NR 440.45(2)(i)(i) “Lime kiln” means a unit used to calcine lime mud, which consists primarily of calcium carbonate, into quicklime, which is calcium oxide. NR 440.45(2)(j)(j) “Multiple-effect evaporator system” means the multiple-effect evaporators and associated condensers and hotwells used to concentrate the spent cooking liquid that is separated from the pulp (black liquor). NR 440.45(2)(k)(k) “Neutral sulfite semichemical pulping operation” means any operation in which pulp is produced from wood by cooking or digesting wood chips in a solution of sodium sulfite and sodium bicarbonate, followed by mechanical defibrating (grinding). NR 440.45(2)(L)(L) “Recovery furnace” means either a straight kraft recovery furnace or a cross recovery furnace, and includes the direct-contact evaporator for a direct-contact furnace. NR 440.45(2)(m)(m) “Smelt dissolving tank” means a vessel used for dissolving the smelt collected from the recovery furnace. NR 440.45(2)(n)(n) “Straight kraft recovery furnace” means a furnace used to recover chemicals consisting primarily of sodium and sulfur compounds by burning black liquor which on a quarterly basis contains 7 weight percent or less of the total pulp solids from the neutral sulfite semichemical process or has green liquor sulfidity of 28% or less. NR 440.45(2)(o)(o) “Total reduced sulfur” or “TRS” means the sum of the sulfur compounds hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide that are released during the kraft pulping operation and measured by Method 16 of 40 CFR part 60, Appendix A, incorporated by reference in s. NR 440.17 (1). NR 440.45(3)(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(3)(a)1.a.a. Contain particulate matter in excess of 0.10 g/dscm (0.044 gr/dscf) corrected to 8% oxygen. NR 440.45(3)(a)2.2. From any smelt dissolving tank any gases which contain particulate matter in excess of 0.10 g/kg black liquor solids, dry weight (0.20 lb/ton black liquor solids, dry weight). NR 440.45(3)(a)3.3. From any lime kiln any gases which contain particulate matter in excess of: NR 440.45(3)(a)3.a.a. 0.15 g/dscm (0.066 gr/dscf) corrected to 10% oxygen, when gaseous fossil fuel is burned. NR 440.45(3)(a)3.b.b. 0.30 g/dscm (0.13 gr/dscf) corrected to 10% oxygen, when liquid fossil fuel is burned. 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.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).