Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 63, Subpt. FFFF, Tbl. 2 Table 2 to Subpart FFFF of Part 63—Emission Limits and Work Practice Standards for Batch Process Vents

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.

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:

Not applicable.

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.