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       EPA Regulations

               ©EPA Regulations on Fluoride for Phosphate Plants

               ©Impact of the Fluoride Regulations

               ©Comments on the regulations and EPA’s responses

　

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EPA Regulations on Fluoride for Phosphate Plants

Class of source
Emission limit for Existing Plants
(lb. F- per ton P2O5 feed)
Emission limit for New Plants
(lb. F- per ton P2O5 feed)
Wet Process Phosphoric Acid Process Line
0.02
0.0135
Superphosphoric Acid Process Line
0.01
0.0087
Diammonium and/or Monoammonium Phosphate Process Line
0.06
0.058
Granular Triple Superphosphate Process Line
0.15
0.123
Granular Triple Superphosphate Storage Buildings
5.0 ×10 -4
5.0 ×10-4
Source: Federal Register, 40 CFR Parts 9 and 63, Vol. 64, No. 111, June 10, 1999.
　
Regulations for new plants are stricter than for existing ones.
　

　

   

Impact of the Fluoride Regulations

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    § Reducing the nationwide HF emissions from 605 tpy (ton per yr)              to 258 tpy

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    § Upgrading or installing wet scrubbing systems to meet the emission              standard

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     § The economic impact is estimated to be low, increasing the                product prices by less than 0.75%.   

　

Comments on the regulations and EPA’s responses

    J Comment: It is not clear whether phosphate facilities actually emit HF                 because no direct measurements of HF emissions from such facilities                 have ever been made.
　

    J Comment: Ammonia also ties up fluoride as ammonium bifluoride,                making HF emissions less likely.

　
    J EPA’s Response: EPA has directly measured HF and SiF4 at two                 facilities using Fourier transform infrared spectroscopy (FTIR). The                 amount of HF measured exceeded the regulation limit.
　

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