Current through August 26, 2024
(1)
APPLICABILITY AND DESIGNATION OF AFFECTED FACILITY.
(a) The affected facility to which the
provisions of this section apply is each wet-process phosphoric acid plant
having a design capacity of more than 15 tons of equivalent P2O5 feed per
calendar day. For the purpose of this section, the affected facility includes
any combination of: reactors, filters, evaporators and hotwells.
(b) Any facility under par. (a) that
commences construction or modification after October 22, 1974, is subject to
the requirements of this section.
(2) DEFINITIONS. As used in this section,
terms not defined in this subsection have the meanings given in s.
NR 440.02.
(a)
"Equivalent P2O5 feed" means the quantity of phosphorus, expressed as
phosphorus pentoxide, fed to the process.
(b) "Total fluorides" means elemental
fluorine and all fluoride compounds as measured by reference methods specified
in sub. (5), or equivalent or alternative methods.
(c) ``Wet-process phosphoric acid plant"
means any facility manufacturing phosphoric acid by reacting phosphate rock and
acid.
(3) STANDARD FOR
FLUORIDES. On and after the date on which the performance test required to be
conducted by s.
NR 440.08 is
completed, no owner or operator subject to the provisions of this section may
cause to be discharged into the atmosphere from any affected facility any gases
to which contain total fluorides in excess of 10.0 g/Mg of equivalent P2O 5
feed (0.020 lb/ton).
(4) MONITORING
OF OPERATIONS.
(a) The owner or operator of
any wet-process phosphoric acid plant subject to the provisions of this section
shall install, calibrate, maintain and operate a monitoring device which can be
used to determine the mass flow of phosphorous-bearing feed material to the
process. The monitoring device shall have an accuracy of $5% over its operating
range.
(b) The owner or operator of
any wet-process phosphoric acid plant shall maintain a daily record of
equivalent P2O5 feed by first determining the total mass rate in Mg/hr of
phosphorus bearing feed using a monitoring device for measuring mass flow rate
which meets the requirements of par. (a) and then by proceeding according to
sub. (5) (b) 3.
(c) The owner or
operator of any wet-process phosphoric acid plant subject to the provisions of
this section shall install, calibrate, maintain and operate a monitoring device
which continuously measures and permanently records the total pressure drop
across the process scrubbing system. The monitoring device shall have an
accuracy of " 5% over its operating range.
(5) TEST METHODS AND PROCEDURES.
(a) In conducting the performance tests
required in s.
NR 440.08, the
owner or operator shall use as reference methods and procedures the test
methods in Appendix A of 40 CFR part 60, incorporated by reference in s.
NR 440.17, or other methods and procedures as specified
in this subsection, except as provided in s.
NR 440.08(2).
(b) The owner or operator shall determine
compliance with the total fluorides standard in sub. (3) as follows:
1. The emission rate (E) of total fluorides
shall be computed for each run using the following equation:
See
PDF for diagram
where:
E is the emission rate of total fluorides, g/Mg (lb/ton)
of equivalent P2O5 feed
Csi is the concentration of total fluorides from emission
point "i", mg/dscm (gr/dscf)
Qsdi is the volumetric flow rate of effluent gas from
emission point "i", dscm/hr (dscf/hr)
N is the number of emission points associated with the
affected facility
P is the equivalent P2O5 feed rate, Mg/hr (ton/hr)
K is the conversion factor, 1000 mg/g (7000 gr/lb)
2. Method 13A or 13B shall be used
to determine the total fluorides concentration (Csi) and volumetric flow rate
(Qsdi) of the effluent gas from each of the emission points. The sampling
shall be at least 60 minutes and 0.85 dscm (30 dscf).
3. The equivalent P2O5 feed rate (P) shall be
computed for each run using the following equation:
P = Mp Rp
where:
Mp is the total mass flow rate of phosphorus-bearing feed,
Mg/hr (ton/hr)
Rp is the P2O5 content, decimal fraction
a. The accountability system of sub. (4) (a)
shall be used to determine the mass flow rate (Mp) of the phosphorus-bearing
feed.
b. The Association of
Official Analytical Chemists (AOAC) Method 9, incorporated by reference in s.
NR 440.17, shall be used to determine the P2O5 content
(Rp) of the feed.
