Fluoride Action Network

Federal Register – Proposed Rule on Mercury from Phosphoric Acid Manufacturing

Source: Federal Register - Proposed Rule | April 7th, 2020 | Environmental Protection Agency
Industry type: Phosphate Industry

[[Page 19418]] – Table 1 to Subpart AA of Part 63–Existing Source Emission Limits a b

You must meet the emission limits for the specified pollutant for the following existing sources

Total fluorides      

Wet-Process Phosphoric Acid Line…..  0.020 lb/ton of equivalent P2O5 feed.

Superphosphoric Acid Process Line c..  0.010 lb/ton of equivalent P2O5 feed.

Superphosphoric Acid Submerged…….  0.020 lb/ton of equivalent P2O5 feed.

Phosphate Rock Calciner…. 9.0E-04 lb/ton of rock feed d.

Total particulate    

Phosphate Rock Dryer……………..   0.181 g/dscm


Phosphate Rock Calciner…………..  0.23 mg/dscm corrected to 3 percent oxygen.e

a The existing source compliance data is June 10, 2002, except as noted.

b During periods of startup and shutdown, for emission limits stated in terms of pounds of pollutant per ton of feed, you are subject to the work practice standards specified in Sec.  63.602(f).

c Beginning on August 19, 2018, you must include oxidation reactors in superphosphoric acid process lines when determining compliance with the total fluorides limit.

d Compliance date is August 19, 2015.


This action proposes to amend the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Phosphoric Acid Manufacturing source category. The proposed amendment is in response to a petition for rulemaking by an industry stakeholder on the mercury emission limit based on the maximum achievable control technology (MACT) floor for existing sources set in a rule that was finalized on August 19, 2015 (“2015 Rule”). All six of the existing calciners used to set this MACT floor were located at the PCS Phosphate Company, Inc. (“PCS Phosphate”) facility in Aurora, North Carolina (“PCS Aurora”). PCS Phosphate asserted that data received since the rule’s promulgation indicate that the MACT floor did not accurately characterize the average emission limitation achieved by the units used to set the standard. Based on these new data, the U.S. Environmental Protection Agency (EPA) proposes to revise the mercury MACT floor for existing calciners.

DATES: Comments.

Comments must be received on or before May 22, 2020.    Public hearing. If anyone contacts us requesting a public hearing on or before April 13, 2020, we will hold a hearing. Additional information about the hearing, if requested, will be published in a subsequent Federal Register document and posted at https://www.epa.gov/stationary-sources-air-pollution/phosphate-fertilizer-production-plants-and-phosphoric-acid. See SUPPLEMENTARY INFORMATION for information on requesting and registering for a public hearing. ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-OAR-2020-0016 by any of the following methods:     Federal eRulemaking Portal: https://www.regulations.gov/ (our preferred method). Follow the online instructions for submitting comments.     Email: a-and-r-docket@epa.gov. Include Docket ID No. EPA-HQ-OAR-2020-0016 in the subject line of the message.     Fax: (202) 566-9744. Attention Docket ID No. EPA-HQ-OAR-2020-0016.     Mail: U.S. Environmental Protection Agency, EPA Docket Center, Docket ID No. EPA-HQ-OAR-2020-0016, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460.     Hand/Courier Delivery: EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The Docket Center’s hours of operation are 8:30 a.m.-4:30 p.m., Monday-Friday (except federal holidays).    Instructions: All submissions received must include the Docket ID No. for this rulemaking. Comments received may be posted without change to https://www.regulations.gov/, including any personal information provided.

*Read the full Notice at https://www.govinfo.gov/content/pkg/FR-2020-04-07/html/2020-06930.htm