NR 463.13(7) (7) Dross-only furnace. On and after the compliance date established by s. NR 463.115, the owner or operator of a dross-only furnace at a secondary aluminum production facility that is a major source may not discharge or cause to be discharged to the atmosphere either of the following:

NR 463.13(7)(a) (a) Emissions in excess of 0.15 kg of PM per Mg (0.30 lb of PM per ton) of feed or charge.

NR 463.13(7)(b) (b) Visible emissions in excess of 10% opacity from any PM add-on air pollution control device if a COM is chosen as the monitoring option.

NR 463.13(8) (8) Rotary dross cooler. On and after the compliance date established by s. NR 463.115, the owner or operator of a rotary dross cooler at a secondary aluminum production facility that is a major source may not discharge or cause to be discharged to the atmosphere either of the following:

NR 463.13(8)(a) (a) Emissions in excess of 0.09 g of PM per dscm (0.04 gr per dscf).

NR 463.13(8)(b) (b) Visible emissions in excess of 10% opacity from any PM add-on air pollution control device if a COM is chosen as the monitoring option.

NR 463.13(9) (9) Group 1 furnace. The owner or operator of a group 1 furnace shall use the limits in this subsection to determine the emission standards for a SAPU under sub. (11).

NR 463.13(9)(a) (a) 0.20 kg of PM per Mg (0.40 lb of PM per ton) of feed or charge from a group 1 furnace, that is not a melting and holding furnace processing only clean charge, at a secondary aluminum production facility that is a major source.

NR 463.13(9)(b) (b) 0.40 kg of PM per Mg (0.80 lb of PM per ton) of feed or charge from a group 1 melting and holding furnace processing only clean charge at a secondary aluminum production facility that is a major source.

NR 463.13(9)(c) (c) 15 mg of D&F TEQ per Mg (2.1 x 10-4 gr of D&F TEQ per ton) of feed or charge from a group 1 furnace at a secondary aluminum production facility that is a major or area source. This limit does not apply if the furnace processes only clean charge.

NR 463.13(9)(d) (d) 0.20 kg of HCl per Mg (0.40 lb of HCl per ton) of feed or charge or, if the furnace is equipped with an add-on air pollution control device, 10% of the uncontrolled HCl emissions, by weight, for a group 1 furnace at a secondary aluminum production facility that is a major source.

NR 463.13(9)(e) (e) The owner or operator of a group 1 furnace at a secondary aluminum production facility that is a major source may not discharge or cause to be discharged to the atmosphere visible emissions in excess of 10% opacity from any PM add-on air pollution control device if a COM is chosen as the monitoring option.

NR 463.13(9)(f) (f) The owner or operator may determine the emission standards for a SAPU by applying the group 1 furnace limits on the basis of the aluminum production weight in each group 1 furnace, rather than on the basis of feed or charge.

NR 463.13(9)(g) (g) The owner or operator of a sidewell group 1 furnace that conducts reactive fluxing, except for cover flux, in the hearth, or that conducts reactive fluxing in the sidewell at times when the level of molten metal falls below the top of the passage between the sidewell and the hearth, shall comply with the emission limits of pars. (a) to (d) on the basis of the combined emissions from the sidewell and the hearth.

NR 463.13(10) (10) In-line fluxer. Except as provided in par. (c) for an in-line fluxer using no reactive flux material, the owner or operator of an in-line fluxer shall use the limits in this subsection to determine the emission standards for a SAPU under sub. (11).

NR 463.13(10)(a) (a) 0.02 kg of HCl per Mg (0.04 lb of HCl per ton) of feed or charge.

NR 463.13(10)(b) (b) 0.005 kg of PM per Mg (0.01 lb of PM per ton) of feed or charge.

NR 463.13(10)(c) (c) The emission limits in pars. (a) and (b) do not apply to an in-line fluxer that uses no reactive flux materials.

NR 463.13(10)(d) (d) The owner or operator of an in-line fluxer at a secondary aluminum production facility that is a major source may not discharge or cause to be discharged to the atmosphere visible emissions in excess of 10% opacity from any PM add-on air pollution control device used to control emissions from the in-line fluxer, if a COM is chosen as the monitoring option.

NR 463.13(10)(e) (e) The owner or operator may determine the emission standards for a SAPU by applying the in-line fluxer limits on the basis of the aluminum production weight in each in-line fluxer, rather than on the basis of feed or charge.

NR 463.13(11) (11) Secondary aluminum processing unit. On and after the compliance date established by s. NR 463.115, the owner or operator shall comply with the emission limits calculated using the equations for PM and HCl in pars. (a) and (b) for each secondary aluminum processing unit at a secondary aluminum production facility that is a major source. The owner or operator shall comply with the emission limit calculated using the equation for D&F in par. (c) for each secondary aluminum processing unit at a secondary aluminum production facility that is a major or area source.

NR 463.13(11)(a) (a) The owner or operator may not discharge or allow to be discharged to the atmosphere any 3-day, 24-hour rolling average emissions of PM in excess of:

å

å

´

(Equation 1)

where:

is the PM emission limit for individual emission unit i in sub. (9) (a) and (b) for a group 1 furnace or in sub. (10) (b) for an in-line fluxer

is the feed or charge rate for individual emission unit i

is the PM emission limit for the secondary aluminum processing unit

NR 463.13 Note Note: In-line fluxers using no reactive flux materials cannot be included in this calculation since they are not subject to the PM limit.

NR 463.13(11)(b) (b) The owner or operator may not discharge or allow to be discharged to the atmosphere any 3-day, 24-hour rolling average emissions of HCl in excess of: