Ep = [(Cs Qsd)1 + (Cs Qsd)2]/(PK)
where:
Ep is the emission rate of total fluorides from a potroom group, kg/Mg (lb/ton)
Cs is the concentration of total fluorides, mg/dscm (gr/dscf)
Qsd is the volumetric flow rate of effluent gas, dscm/hr (dscf/hr)
P is the aluminum production rate, Mg/hr (ton/hr)
K is the conversion factor, 106 mg/kg (7000 gr/lb)
1 is the subscript for primary control system effluent gas
2 is the subscript for secondary control system or roof monitor effluent gas
NR 440.36(6)(b)2.2. The emission rate (Eb) of total fluorides from anode bake plants shall be computed for each run using the following equation: Eb = (Cs Qsd)/(PeK)
where:
Eb is the emission rate of total fluorides, kg/Mg (lb/ton) of aluminum equivalent
Cs is the concentration of total fluorides, mg/dscm (gr/dscf)
Qsd is the volumetric flow rate of effluent gas, dscm/hr (dscf/hr)
Pe is the aluminum equivalent for anode production rate, Mg/hr (ton/hr)
K is the conversion factor, 106 mg/kg (7000 gr/lb)
NR 440.36(6)(b)3.3. Method 13A or 13B shall be used for ducts or stacks and Method 14 for roof monitors not employing stacks or pollutant collection systems, to determine the total fluorides concentration (Cs) and volumetric flow rate (Qsd) of the effluent gas. The sampling time and sample volume for each run shall be at least 8 hours and 6.80 dscm (240 dscf) for potroom groups and at least 4 hours and 3.40 dscm (120 dscf) for anode bake plants. NR 440.36(6)(b)4.4. The monitoring devices of sub. (5) (a) shall be used to determine the daily weight of aluminum and anode produced. NR 440.36(6)(b)4.a.a. The aluminum production rate (P) shall be determined by dividing 720 hours into the weight of aluminum tapped from the affected facility during a period of 30 days before and including the final run of a performance test. NR 440.36(6)(b)4.b.b. The aluminum equivalent production rate (Pe) for anodes shall be determined as 2 times the average weight of anode produced during a representative oven cycle divided by the cycle time. An owner or operator may establish a multiplication factor other than 2 by submitting production records of the amount of aluminum produced and the concurrent weight of anodes consumed by the potrooms. NR 440.36 HistoryHistory: Cr. Register, January, 1984, No. 337, eff. 2-1-84; am. (6) (a), Register, September, 1986, No. 369, eff. 10-1-86; am. (2) (intro.), (3) (a) 3., (6) (a), r. (6) (b), Register, September, 1990, No. 417, eff. 10-1-90; renum. (6) (a)to be (5) (c), cr. (6) (a) and (b), r. (6) (c) to (i), Register, July, 1993, No. 451, eff. 8-1-93; correction in (2) (a) made under s. 13.93 (2m) (b) 7., Stats., Register, November, 1999, No. 527; CR 06-109: am. (1) (b), (3) (a) (intro.) and (6) (b) 1. and 2., cr. (1) (c) Register May 2008 No. 629, eff. 6-1-08. NR 440.37NR 440.37 Phosphate fertilizer industry: wet-process phosphoric acid plants. NR 440.37(1)(1) Applicability and designation of affected facility. NR 440.37(1)(a)(a) The affected facility to which the provisions of this section apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons of equivalent P2O5 feed per calendar day. For the purpose of this section, the affected facility includes any combination of: reactors, filters, evaporators and hotwells. NR 440.37(1)(b)(b) Any facility under par. (a) that commences construction or modification after October 22, 1974, is subject to the requirements of this section. NR 440.37(2)(2) Definitions. As used in this section, terms not defined in this subsection have the meanings given in s. NR 440.02. NR 440.37(2)(a)(a) “Equivalent P2O5 feed” means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process.