['Air Programs']
['Hazardous Air Pollutants']
04/15/2024
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As required in §63.2460, you must meet each emission limit and work practice standard in the following table that applies to your batch process vents:
| For each . . . | Then you must . . . | And you must . . . |
|---|---|---|
| 1. Process with Group 1 batch process vents | a. Reduce collective uncontrolled organic HAP emissions from the sum of all batch process vents within the process by ‰¥98 percent by weight by venting emissions from a sufficient number of the vents through one or more closed-vent systems to any combination of control devices (except a flare); or | Not applicable. |
| b. Reduce collective uncontrolled organic HAP emissions from the sum of all batch process vents within the process by ‰¥95 percent by weight by venting emissions from a sufficient number of the vents through one or more closed-vent systems to any combination of recovery devices or a biofilter, except you may elect to comply with the requirements of subpart WW of this part for any process tank; or | Not applicable. | |
| €ƒ | c. Reduce uncontrolled organic HAP emissions from one or more batch process vents within the process by venting through a closed-vent system to a flare or by venting through one or more closed-vent systems to any combination of control devices (excluding a flare) that reduce organic HAP to an outlet concentration ‰¤20 ppmv as TOC or total organic HAP | For all other batch process vents within the process, reduce collective organic HAP emissions as specified in item 1.a and/or item 1.b of this Table. |
| 2. Halogenated Group 1 batch process vent for which you use a combustion device to control organic HAP emissions | a. Use a halogen reduction device after the combustion control device; or | i. Reduce overall emissions of hydrogen halide and halogen HAP by ‰¥99 percent; or ii. Reduce overall emissions of hydrogen halide and halogen HAP to ‰¤0.45 kg/hr; or iii. Reduce overall emissions of hydrogen halide and halogen HAP to a concentration ‰¤20 ppmv. |
| b. Use a halogen reduction device before the combustion control device | Reduce the halogen atom mass emission rate to ‰¤0.45 kg/hr or to a concentration ‰¤20 ppmv. | |
| 3. Batch process vent that contains ethylene oxide such that it is considered to be in ethylene oxide service as defined in §63.2550 | Beginning no later than the compliance dates specified in §63.2445(i), comply with the applicable emission limits specified in items 1 and 2 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. | Not applicable. |
[68 FR 63888, Nov. 10, 2003, as amended at 71 FR 40339, July 14, 2006; 85 FR 49161, Aug. 12, 2020]
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