['Air Programs']
['Hazardous Air Pollutants']
04/15/2024
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As required in §63.2455, you must meet each emission limit and work practice standard in the following table that applies to your continuous process vents:
| For each . . . | For which . . . | Then you must . . . |
|---|---|---|
| 1. Group 1 continuous process vent | a. Not applicable | i. Reduce emissions of total organic HAP by ‰¥98 percent by weight or to an outlet process concentration ‰¤20 ppmv as organic HAP or TOC by venting emissions through a closed-vent system to any combination of control devices (except a flare); or |
| ii. Reduce emissions of total organic HAP by venting emissions through a closed vent system to a flare; or | ||
| iii. Use a recovery device to maintain the TRE above 1.9 for an existing source or above 5.0 for a new source. | ||
| 2. Halogenated Group 1 continuous process vent stream | a. You use a combustion control device to control organic HAP emissions | i. Use a halogen reduction device after the combustion device to reduce emissions of hydrogen halide and halogen HAP by ‰¥99 percent by weight, or to ‰¤0.45 kg/hr, or to ‰¤20 ppmv; or |
| €ƒ | ii. Use a halogen reduction device before the combustion device to reduce the halogen atom mass emission rate to ‰¤0.45 kg/hr or to a concentration ‰¤20 ppmv. | |
| 3. Group 2 continuous process vent at an existing source | You use a recovery device to maintain the TRE level >1.9 but ‰¤5.0 | Comply with the requirements in §63.2450(e)(4) and the requirements in §63.993 and the requirements referenced therein. |
| 4. Group 2 continuous process vent at a new source | You use a recovery device to maintain the TRE level >5.0 but ‰¤8.0 | Comply with the requirements in §63.2450(e)(4) and the requirements in §63.993 and the requirements referenced therein. |
| 5. Continuous process vent | Beginning no later than the compliance dates specified in §63.2445(i), the continuous process vent contains ethylene oxide such that it is considered to be in ethylene oxide service as defined in §63.2550 | Comply with the applicable emission limits specified in items 1 through 4 of this Table, and also: i. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a flare; or ii. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a control device that reduces ethylene oxide by ‰¥99.9 percent by weight, or to a concentration <1 ppmv for each process vent or to <5 pounds per year for all combined process vents. |
[85 FR 49161, Aug. 12, 2020]
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